Question and Submission History

Yes. ESA's business model is to develop, permit, and design the facility, and then transfer the project to a long-term owner-operator prior to construction. However, the conditions of approval, the permit requirements, and the decommissioning bond 'run with the project', so a future owner inherits them. Any benefit terms the town and the project put into a signed agreement would carry to a future owner the same way. Our public commitments are recorded in the Commitment Tracker on this site so residents can check them at every stage.

The project requires review and permits from several agencies at both the local and state levels. Locally, this includes the Charlton Conservation Commission (wetlands and stormwater review) and the Select Board (community benefits discussions). At the state level, it includes the Energy Facilities Siting Board (EFSB consolidated permit), Massachusetts Department of Environmental Protection (MassDEP), Massachusetts Environmental Policy Act (MEPA) office, and the Division of Fisheries & Wildlife (Natural Heritage/NHESP review). Each of these reviews is public. In the EFSB proceeding, residents can comment on the record, and community groups and the town can ask to intervene as full parties. The state's Intervenor Support Grant Program, run by the Department of Public Utilities, helps intervenor groups pay for the attorneys and technical experts that participation takes. The program page linked below has the eligibility rules and application details.

The current design expects to clear 10 acres or less of forested land (representing about 21% of the 47.13-acre parcel). To date, no heritage or old-growth trees have been identified in the proposed equipment footprint.

In April 2024, ESA petitioned the Charlton Planning Board for an Energy Storage Overlay District. We withdrew the petition shortly after to align with the Planning Board's timeline and wait for the state's consolidated Energy Facilities Siting Board (EFSB) permitting rules to be finalized.

The proposed facility will have a capacity of 150 megawatts (MW) of battery storage, enough stored energy to serve up to 120,000 homes for about four hours, feeding the regional grid. The fenced equipment area itself will cover about 5 acres or less, and total site disturbance, including tree clearing, will not exceed 10 acres of the just over 47-acre parcel.

Battery storage (BESS) isn't about generating electricity, just like a water tower isn't about generating water. It is about getting more use out of the energy we already produce, leveraging it to meet peak demand and regulate the grid throughout the day. Because Charlton is uniquely and strategically positioned near a major East-West transmission line, it serves as a critical node for reinforcing grid reliability and efficiency as electric load rises.

Under state EFSB regulations, co-located or adjacent projects may share grid infrastructure, but they are not exempted from review. Any separate project, regardless of ownership, must undergo its own independent public permitting review and meet all safety, environmental, and site-specific criteria.

The project developer, ESA, is domiciled in Delaware, with corporate headquarters located in Maitland, Florida.

Yes. Digital copies of all presentation materials and slide decks were shared with the Town Administrator to be posted publicly on the Town of Charlton website, and they are also hosted on our project website.

To protect local water resources, the project must secure permits and approvals from the Massachusetts Department of Environmental Protection (MassDEP) and comply with US EPA standards. ESA is conducting detailed hydrological and stormwater studies to design containment systems that prevent runoff from the site. All engineering plans, environmental reports, and site designs will be published in the Document Library as they are finalized.

Yes. A site-specific Emergency Action Plan (EAP) is being developed in close coordination with Charlton Fire Chief Rob Barton. This plan will include a formal failure mode analysis, outline responder training protocols, and detail the equipment and safety systems needed to comply with NFPA 855 standards.

Decommissioning is a strict regulatory requirement at both the state and local levels. The developer is legally obligated to safely remove all battery equipment and restore the site to a stable, pre-development condition. To guarantee these funds are available, the project will establish a decommissioning bond or financial surety before construction begins. This bond runs with the project, remaining legally binding on any future owner or operator.

In the rare event of a thermal runaway fire, standard safety protocol is to allow the affected container to burn out under controlled conditions to prevent contaminated water runoff. The smoke contains compounds like hydrogen fluoride and carbon monoxide. The site layout keeps the equipment approximately 500 feet from the nearest residential building, and the battery systems are designed to prevent fire from spreading between units, a design validated through UL 9540A large-scale fire testing.

ESA Solar is a pre-development firm specializing in engineering, zoning, and permitting. We do not construct or operate the facilities long-term. Instead, we partner with major utility-scale capital partners to handle construction and operation. We will provide reference links to similar BESS facilities operating successfully under these exact same permitting and safety standards to demonstrate the project's long-term viability.

Under the 2024 Climate Act's consolidated permitting process, the state Energy Facilities Siting Board holds final permitting authority over clean energy infrastructure of this scale. If the town declines to negotiate, the project can still be permitted by the state, and the town would receive whatever standard tax assessments yield. We are still researching what those assessments would amount to for a project like this, and we will publish that analysis when it is complete. The Community Benefits Plan process gives the town a direct say in what the project delivers locally. Predictable annual payments for things like local infrastructure, senior centers, and emergency services are the kinds of terms the town can raise there. If the town wants payment terms beyond standard taxation, tools like a Payment in Lieu of Taxes (PILOT) agreement are available for the town and the project to consider together. Comparable Massachusetts battery storage projects in Carver and Medway reached agreements this way, and we will share their figures as reference points as the community benefits discussions continue. Negotiating is also not the town's only lever. The town, and any organized group of residents, can intervene as a party in the EFSB proceeding, and the state's Intervenor Support Grant Program can fund the attorneys and technical experts that participation takes.

We understand your frustration and respect the town's history with past infrastructure decisions. Siting battery storage systems under the 2024 Climate Act (Chapter 239) consolidates permitting under the state's Energy Facilities Siting Board (EFSB) rather than local municipal boards. However, the regulations require developers to conduct meaningful engagement before filing: informing residents, gathering input, and documenting how that input was incorporated into the project. The pre-filing period is the best time to shape the project because the design is still open. When community input leads to a design change, such as a visual setback or a safety measure, we record it in the public Commitment Tracker on this site and carry it into the plans we file with the state. We are also required to pursue a Community Benefits Plan with the town, and that process is where broader benefit topics get worked out together. The state review itself also gives residents formal standing. When the project files with the EFSB, residents can comment on the record, and community groups, nonprofits, and the town can ask the Siting Board for intervenor status, which makes them full parties to the case. The same 2024 law created the Intervenor Support Grant Program to fund that participation. It pays intervenor groups up to $150,000 per proceeding for attorneys, expert witnesses, and other participation costs, and it covers proceedings that begin on or after July 1, 2026, which includes the future review of this project.

No. We do not have permits yet. We remain in the pre-filing stage and have not submitted any applications. We want to gather community feedback first to incorporate your concerns into our design. We intend to file for interconnection with ISO-New England in October of this year, but we will likely file our application with the state Energy Facilities Siting Board (EFSB) in 2027. Once we file, the EFSB review becomes a formal public proceeding. Residents can comment on the record, and community groups and the town can seek intervenor status to participate as full parties. The state's Intervenor Support Grant Program helps fund that participation, paying intervenor groups up to $150,000 per proceeding for attorneys and technical experts. It covers proceedings that begin on or after July 1, 2026, so it will be available for this project's review.

We prioritize protecting your home, land, and water. Siting battery systems requires strict adherence to MassDEP stormwater regulations. We designed the site grading so that all surface runoff drains away from neighboring homes and is captured within dedicated, lined retention basins. Under state law, the post-development runoff rate cannot exceed the pre-development rate. For a well located to the north and uphill of the equipment footprint, the natural slope directs surface drainage away from the well, and our hydrological studies will confirm how groundwater moves across the site. We are also constructing a continuous catchment swale along the southern boundary to capture and filter any surface runoff before it can reach adjacent properties.

Yes, we are fully aware of the severe impact that the past Exxon Mobil MTBE contamination had on Charlton's private wells. We respect how sensitive groundwater issues are for local families. To prevent any contamination risk, our site design employs multiple physical barriers. The battery containers use sealed steel enclosures with built-in containment pans to capture any fluids. Furthermore, we are designing our stormwater management system in compliance with MassDEP's strict groundwater protection standards, preventing any untreated runoff from soaking into the water table. We will also participate in regular groundwater monitoring program protocols established with the local Board of Health.

On lightning strike mitigation: We install specialized surge arresters and active grounding grids that meet NFPA 780 lightning protection standards. We are also adding a lightning transient analysis to our electrical safety models to verify the system can isolate and ground a strike without damage.

On fire-water runoff containment: Modern safety protocols for lithium-ion battery fires recommend letting a single contained cabinet burn out rather than spraying huge amounts of water. In past industry incidents, the firefighting water itself, not the fire, created contaminated runoff. If the fire department must use water to cool adjacent units, a continuous concrete foundation and a lined drainage swale will capture and contain the runoff for safe disposal.

On the water supply and fire pond: Siting a battery system under NFPA 855 does not require a dedicated fire-water pond on site. We are coordinating directly with Charlton Fire Chief Rob Barton to determine the exact water supply, dry hydrant, and equipment needs. If required, we will construct a dedicated cistern or dry-hydrant connection point at the developer's expense.

We understand and validate your safety concerns regarding high-profile incidents like the Otay Mesa fire in California. To protect the surrounding neighborhood, our design uses four levels of safety. First, the lithium iron phosphate (LFP) battery chemistry is inherently less prone to thermal runaway than other chemistries. Second, each container has an automated off-gas detection system that triggers deflagration venting before any gas build-up can occur. Third, the equipment sits approximately 500 feet from the nearest residential building, which is the landowner's own home. Fourth, we are drafting a community-specific Emergency Action Plan with Charlton Fire. The lessons from California show that spraying water can actually prolong fires and create runoff, so our protocol favors controlled burnout of an isolated cabinet. We will present a complete, independent fire safety analysis at our webinar on August 19.

Our spacing complies with the manufacturer's safety specifications for current-generation Tesla Megapack 3 units, which are designed to prevent thermal spread while allowing responder access. The units require a minimum clearance of 25 inches side-to-side, 9 to 24 inches back-to-back (depending on the configuration), and 108 inches (9 feet) at the front of each unit. Beyond these unit-to-unit clearances, the outer perimeter fence sits approximately 50 feet away from the battery layout, with a 26-foot access road running inside the fence to accommodate emergency and maintenance vehicles.

According to the Tesla Megablock / Megapack 3 technical specifications, each individual unit is 336.5 inches (28.0 feet) long, 112 inches (9.3 feet) tall, and 75.75 inches (6.3 feet) deep. This depth represents the pack's overall thickness. For the steel walls, the published engineering reports specify a structural pressure rating rather than a wall thickness. That rating comes from the Fire Protection Engineering report for the earlier Megapack 2/2XL generation, which the Megapack 3 evolved from: the enclosure withstands 30 kPa (626 psf) of pressure, and the overpressure vents open at 12 kPa to provide a 2.5 times safety factor. This rating depends on the entire assembly, including framing, stiffeners, and door latching, which prevents us from defining a single wall thickness. The only 5/8-inch (16 mm) steel plate in the specifications belongs to the foundation-anchor welding pads at the four corners, which secure the unit to the ground. Tesla has not yet published complete performance documentation for the Megapack 3, and we will share model-specific engineering reports as they become available.

The steel enclosure has an IP66/NEMA 3R weather rating to prevent dust and water ingress, but it is not armored. A gunshot will likely pierce the skin. If a puncture breaches the cells, it triggers an internal short. This initiates a sequence identical to a standard internal cell defect. The Battery Management System automatically isolates the unit, and standard site safety protocols manage the response. We address physical security threats through site-hardening measures, including secure perimeter fencing, 24/7 camera monitoring, setbacks, and vehicle barrier bollards.

No, and we avoid doing this because enclosing batteries in buildings increases safety risks. Historically, the 2019 explosion in Surprise, Arizona, showed that sealed structures allow flammable gases to accumulate, causing a backdraft when opened. More recently, building-housed fires at Otay Mesa (May 2024) and Moss Landing (January 2025) demonstrated that even with ventilation, buildings trap extreme heat, accelerate cascading runaway between racks, and block direct firefighter access, prolonging the fires for days. Our open-air, containerized design prevents gas and heat accumulation, isolates potential incidents to a single steel cabinet, and ensures emergency responders have immediate, 360-degree access to cool the units.

A battery fire can release hydrogen fluoride and other irritant gases. Wind and atmospheric stability determine how far these gases travel. Breezy days disperse the plume quickly, whereas calm or humid air holds it together longer. Real-world monitoring data supports this conclusion. During the 2025 Moss Landing fire, which is the largest documented battery storage fire to date, the EPA reported that its air monitoring for hydrogen fluoride and particulate matter found no exceedances of health standards and no risk to public health at any distance sampled. An industry assessment by American Clean Power, reviewing 35 documented U.S. battery fire incidents from 2012 through 2024, found no case where gas concerns extended meaningfully beyond the immediate fire area. Our state application includes a site-specific plume analysis that models stagnant, breezy, and humid conditions to confirm this outcome here. We will publish the finalized analysis in the public docket.

The chiller and cooling fans produce most of the sound. We are working with Tesla to confirm which specifications we can publish. These cooling systems commonly operate well below their maximum capacity. Sound levels drop by about 6 dBA every time the distance doubles, so homes 300 feet away hear much less. However, sound remains a real concern for close neighbors.

We will clear about ten acres of mature trees. To offset this, we are planning replanting programs and conservation partnerships. We design the site to minimize noise and manage runoff. Our engineers also account for the nearby conservation land and wildlife throughout the design process.

We have noted this recommendation. Our containment design is built to keep an incident to a single battery unit; in the US record, fires at the older Megapack sites stayed within one or two units. Our site plan will fully account for adjacent properties, including the power plant, the energy storage facilities, and the nature preserve.

Construction will be temporary, lasting roughly 18 months. We will coordinate all truck routes and timing directly with the town. We are also reviewing the capacity of local roads to handle construction traffic, and we will address any potential impacts before work begins. Since the utility used Carpenter Hill Road to construct the two existing substations, the road is already rated for heavier truck loads. However, we can and should discuss terms in the Community Benefit Plan, such as road bonding, to cover any repairs for damage attributable to the project.

During construction, we will follow strict erosion and stormwater controls, including silt fences, soil re-establishment, and cover cropping. These measures prevent the runoff and compaction problems that occurred during past projects in town. Our equipment meets all applicable NFPA fire codes. We cover the lightning analysis in the safety section above, and we address the lifespan and decommissioning plans below.

Yes. ESA develops and permits the project, and then a long-term owner and operator builds and runs the facility.

Yes. Any conditions and commitments we establish during this process bind whoever owns the project.

ESA remains the asset owner and holds full responsibility for the site until we sell the project. Any conditions, including the financial security to decommission the equipment at the end of its lifespan, carry over to the new owner.

Correct. We currently hold a lease option with the landowner during the development phase. We will only execute the full, long-term lease if the state approves the project. These meetings do not change our lease terms. If the project does not go forward, we will not proceed with the operational lease.

The system itself is built to last more than 20 years. Because batteries naturally degrade, we will swap out or add LFP battery modules over time to keep the facility running at full capacity.

We address the entire lifecycle of the batteries upfront. Siting regulations require us to submit a formal decommissioning plan to the town and state before construction. The project owner must post a decommissioning bond, which is a financial deposit held by the town to cover all removal costs. At the end of the facility's operating life, the owner will disassemble the units and transport the batteries to certified recycling facilities. Companies like Redwood Materials and Li-Cycle can recover more than 95% of the metals in these cells, including the lithium, copper, and aluminum, to manufacture new batteries. We will then restore the leased land to its original, vegetated condition.

The facility does not act as a local backup generator, so it will not supply power directly to neighborhood homes during a blackout. Instead, it stores energy and feeds the regional grid, holding enough stored energy to serve up to 120,000 homes for about four hours. The project benefits the community by supporting grid reliability during peak demand periods and generating negotiated funding for the town.

The facility buys power from the grid when demand is low and prices are cheap, and then sells it back during peak periods when prices are higher. It also regulates the voltage and frequency of the transmission lines. You can think of it like a water tower, which stores water to maintain steady water pressure. The battery facility does the same thing for the grid.

Adding energy capacity during peak demand periods actually pushes electricity prices down rather than up. Although the facility buys low and sells high, the extra supply during peak hours lowers the overall market rate. This extra capacity also reduces the need to run expensive, polluting backup power plants.

We have not modeled this yearly figure yet. The total storage depends on the final equipment selection and our ongoing interconnection study. We will share this calculation as soon as we run the models.

Building the project will cost roughly $200 million to $300 million. ESA creates value by developing and permitting the site, which represents a small fraction of that total cost. The future buyer will purchase the permitted project before construction begins.

We have not decided on a tax program yet because ESA will not own the project long term. The final tax structure and payments depend on negotiations between the future owner and the town. We will focus on these terms during our upcoming community benefit discussions.

A Planning Board member mentioned an estimate of $30,000 annually in real estate taxes during the meeting. We still need to confirm this figure, along with what personal property taxes would contribute, and we will publish that analysis when our research is complete. Beyond direct tax payments, the Community Benefits Plan is where topics like fire safety equipment, conservation lands, local hiring preferences, and protections for neighbors get worked out between the town and the project.

The Community Benefits Plan takes shape during the pre-filing period, and the town and the project build it together. Whether specific items later move into a signed agreement is a decision the town and the project would make together, with review by the Select Board and the Town Administrator, and every town board invited to weigh in, especially the Planning Board. We understand residents want commitments they can count on. That is why we record every public commitment in the Commitment Tracker with its status and the proof behind it.

Yes, if both parties agree. If the town and the project sign an agreement, it can be amended later when both sides consent to the change. On the town's side, that would run through the same public process used to create it, such as a Select Board vote or Town Meeting. The most productive time to shape terms is now, during the pre-filing period, which is why these discussions are happening before the state review begins.

We completely agree, and we want you to hold us to that standard. Since we do not live in Charlton, we rely on local residents to tell us what matters. We aim to protect the local environment and act as a good neighbor throughout this process.

Yes. We have modified the site design since our first petition to amend the zoning bylaws for an energy storage overlay, transitioning from Megapack 2XL units to Megapack 3 units. We believe the Megapack 3 design offers the best solution for several reasons. It features safety improvements and a more efficient physical footprint. Its integrated design also means the manufacturer delivers it from the factory ready to install with inverters, transformers, and switchgear built directly into the unit. Having said that, we remain willing to investigate other designs with community input because many other battery storage options exist.

Charlton was not chosen so much as the Carpenter Hill Substation was. The 345 kV and 115 kV transmission lines meet there, and it connects eastern and western Massachusetts. We described it as an interchange on a highway, where voltage can be stepped up or down to serve the region. Battery storage fits best at a substation like this one. When we find a suitable substation, we reach out to the surrounding landowners to see whether any are willing to lease land to host a project.

We looked at substations across the market. A site has to meet three tests: a substation that can support storage, land that can actually be built on (many sites are wetlands or otherwise unbuildable), and a landowner who is willing to lease. Very few sites passed all three.

ESA did. We start by looking at the grid. When electricity prices swing up and down, that signals a need for storage to smooth them out. We are all part of one New England grid, so that need is regional. The substation here is also close to where the power lines already are, so it needs very little new infrastructure.

ESA develops the project. We find the site, design it, get the permits, and do the community engagement. We will not be the long-term owner. A company that can build and operate it will take it over, and no owner has been chosen yet. The permits, bonds, and agreements go with the project to that owner.

An owner could be a utility, an infrastructure fund, or an energy company. We cannot name any, because none has been selected. Owners earn money in three main ways: charging the battery when power is cheap and selling it when power is expensive, payments for being available when the grid needs backup, and services that keep the grid balanced second by second.

The leased project area would be about 15 acres, on a 47-acre parcel. The fenced equipment area inside it would be about 5 acres. The rest of the parcel is not part of the project area. We have not published lease terms.

The project is planned on leased land, not purchased land. Lease terms are not published.

A 150 megawatt battery energy storage system with about 600 megawatt-hours of storage, which is about four hours at full output. The latest design uses 136 battery units, down from 156 in July. It stores electricity from the grid and sends it back. It does not generate any power, and there is no solar or gas. It does more than provide backup in an outage: it also helps keep voltage and demand steady on the grid.

No. Batteries can overheat in a chain reaction called thermal runaway. Early projects, built with older designs and chemistries before current fire standards, had more problems. The Electric Power Research Institute keeps a public database of failures at battery sites. It shows failures per unit of energy installed fell about 99 percent between 2018 and 2025, and the 2023 rate was comparable to the failure rate of utility transformers. The batteries proposed here use lithium iron phosphate, which has no cobalt or nickel. The U.S. Tesla Megapack fires recorded in EPRI's public failure database involved earlier systems with nickel-based chemistry. None involved lithium iron phosphate, the chemistry proposed here. That chemistry is safer, not safe. Each unit has built-in fire detection and automatic shutdown. These lower the risk, but they do not remove it. That is why the Emergency Action Plan matters.

Battery systems are tested to UL 9540A, the standard test method for thermal runaway fire propagation. It runs at four levels: the cell, the module, the full unit, and the installed layout. In the larger tests, a fully loaded unit is forced into thermal runaway, and the neighboring units, placed at the real spacing, are monitored to confirm the fire does not spread to them. NFPA 855, the national standard for installing these systems, uses these test results to set requirements such as the spacing between units. The Megapack 2 and 2XL were tested this way, and the results are in the Fire Protection Engineering report in the Document Library. The test reports for the newer Megapack 3 are still being collected, and we will post them as they are released.

The most extreme fire test in the report on the Megapack 2 and 2XL, the earlier models, put a fully loaded unit into forced thermal runaway with its battery management and cooling systems turned off. Visible flames lasted 6 hours and 40 minutes, and flame intensity peaked about 60 to 90 minutes after flaming began. The fire stayed in one cabinet and burned about half of it. The report's fire modeling shows it would not spread to neighboring cabinets at the clearances studied. The unit was watched for several hours afterward, and no further fire was observed. The full report is linked below. This project will use the Megapack 3, and its test reports are still being collected, so burn-time figures for this site have not been published. In a 2022 fire at a Tesla Megapack site in California, the fire stayed in one unit out of 256 and burned out in about five hours. The Emergency Action Plan, being built with Charlton Fire, is where the response is written down. An independent reviewer the town selects will check it.

Fire experts advise against spraying water on a burning battery unit. The response being planned is defensive: keep people back, protect the surroundings, and monitor the air while the unit burns out. It is not "doing nothing." Firefighters would work to keep the fire from reaching anything else, and the test reports show why a unit can be left to burn out. In the most extreme test on the Megapack 2 and 2XL, the fire stayed in one cabinet. Water is still used. It can cool equipment next to the burning unit, and a water spray can help knock down smoke from the plume. It is kept off the burning unit itself, because water that touches it can pick up contaminants. Any firefighting water used is captured on site.

Smoke from a battery fire can contain carbon monoxide and hydrogen fluoride, and even small amounts of hydrogen fluoride can be harmful. It is a real hazard close to the fire, mainly for firefighters and anyone nearby. What has been measured at other fires is reassuring but limited. A September 2026 report by Fire & Risk Alliance, an independent fire engineering firm, reviewed air monitoring at seven U.S. battery fires, plus the January 2025 fire at Moss Landing, California. At the fires where air was sampled, including in nearby communities, nothing was found above public health limits. At Moss Landing, six days of community air monitoring detected no hydrogen fluoride. The report also explains why: hydrogen fluoride dissolves in water, sticks to surfaces and smoke particles, and is diluted by air as smoke travels. The incident review it draws on was commissioned by the American Clean Power Association, the industry trade group. These were other sites with other equipment, and the sampling covered air only, so this does not tell us what would happen here. We have committed to publish a gas plume analysis, which looks at where smoke and gas could travel. We have not published it yet, so we cannot tell you that any road or home would be unaffected.

The Emergency Action Plan is where evacuation and shelter-in-place decisions belong. It is not published yet. Residents raised two specific problems at the public meeting: Route 20 backups on holidays and in snow that could slow fire trucks from other towns, and narrow rural roads with one way out. We wrote both down for the plan.

Three things are in progress. The Emergency Action Plan covers the response. The draft Community Benefits Plan proposes testing private wells within 1,000 feet of the work limit at the project's cost, with bottled water within 48 hours if a test shows a change linked to the site. It also proposes a payment if a home within 1,000 feet sells for less than an independent appraisal says it is worth without the facility. These are drafts and not promises yet.

The project's position is that fire equipment and training are a cost of the project, not something the town pays for. It is listed in the draft Community Benefits Plan for transparency. The plan is still a draft, so it is not a final commitment yet.

No equipment decision on suppliers has been made, and details will be confirmed in the filing with the state.

These were specific asks from a Planning Board member, and they are on our list. Testing each unit to the fire standard is routine. We told the committee member that testing the whole site as a system is best practice and should be in the plan. Replacement parts and recalls are also tied to the equipment warranty, which gives the owner a reason to stay with the maker. None of this is a commitment yet.

Since July, we have looked at two ways. One is moving the equipment on the site, which has mostly not worked for several reasons. The other is a different technology. We are watching sodium-ion batteries, which are promising on safety but are not yet available at scale. Any change in the battery technology would have to go back through approvals. Nothing is decided.

No study yet answers this for a fire. We have committed to a groundwater monitoring program with terms in writing before construction starts, and to publish the hydrology and stormwater studies. A well inventory within one mile is complete, and a door-to-door survey within half a mile is next. If you rely on a private well, send us your road so we can check it against the site plans, and we add wells to our list each time someone notifies us.

Trees slow and store water during a storm. Part of the area is already inside National Grid's easement. We have committed to no net increase in runoff and to no wetland fill. Soils on the site drain poorly, so water tends to run across the surface, and water also flows onto the site from the north. The design being developed uses basins on both the north and south sides, sized for storm events. We have not published the engineering numbers. Our mapping shows rain that lands on the equipment area draining south into a chain of wetlands. That covers surface water only. It does not tell us about groundwater.

Containing all of the site's runoff would have to be part of the filing. Staff also said we could show it in the site plan sooner. Firefighting water is already a commitment to capture on site on a hard surface, and so is runoff along the southern boundary. Whether the site needs a full liner is an engineering question for a geotechnical survey and is not answered here.

No. That spill is a different location and is not in the area this project is part of. We are sorry that your well was affected.

The state noise policy sets the limit. Sound from the facility may not be more than 10 decibels above the existing background sound at the property line and at the nearest homes. Meeting that limit is a condition of the state permit, and it binds any owner. The first screening found that the two closest property lines, along the transmission line, would be above that limit. The closest dwelling to the equipment is the home of the landowner who is leasing the site to the project. The screening used stand-in equipment data, because sound data for the Megapack 3 is not available yet. The project is testing design changes to bring those property lines within the limit, including a sound wall. The full sound study will measure background sound at nearby homes and predict the sound level at each. It will be published, and its results, not the screening, set the design. Decibel figures mentioned at the meeting came from preliminary data and varied. The figures to rely on will come from the full study.

Three sources: the cooling heat pump in each battery unit, the inverters that convert the electricity, and the transformers that raise the voltage. Each cabinet has all three.

Construction is temporary, about 12 to 18 months, during the day. We will plan truck routes with the town.

Residents pointed to another town's storage project that has a sound barrier built in. This has been recorded as feedback. A sound wall is one of the fixes being tested.

The state looks at this directly. The census block group around the site scores 80.9 out of 100 on the state's burden measure, and anything over 75 is considered burdened. Drivers include the power plant, the gas storage, a closed landfill, a small spill, and the impaired Cady Brook. Our aim is for the project to add no burden, or to help reduce it. That is part of why the Community Benefits Plan exists.

There is no single score. The tool looks at several criteria, and the results are provisional until it is re-run on the full area. Two points matter most: there is no farmland within the project footprint, and the main tradeoff is trees, which store carbon and provide habitat. We are looking at clearing fewer trees or adding habitat elsewhere.

Each project is considered on its own merits, and we take cumulative burden into account. It is high for this census block. Storage is different from solar: it does not produce new power, but makes more efficient use of power already on the grid.

No. National Grid planned and carried out those upgrades for future use, and not for this project. National Grid does have to approve our connection, and it studies whether we can connect safely under its standards.

Three things bind any owner to this project. The conditions of approval attached to the state permit are legally binding, and an owner who ignores them risks losing the permit. A decommissioning bond is required before construction. And the Community Benefits Plan, plus any signed agreement with the town, goes with the project. Anyone who buys it sees all of this before they buy.

The owner is responsible, and the decommissioning bond is there so that money exists even if an owner fails. The bond is required before construction, and the amount is not set yet. A third-party engineer works out the cost of removal, with the town's review. Battery systems are modular, so removal is relatively simple. The site would be restored toward forest.

The bond is meant to be reviewed on a schedule, with an engineer reassessing the cost, and the owner is responsible for keeping it adequate. We have not published the review schedule.

Not decided. Residents asked, and we have written it down.

A resident asked whether ESA would put money in escrow for legal enforcement. We said it goes on the list. It is not decided, and anything that is committed will be in the Community Benefits Plan.

We cannot speak to other projects. We can say that the new state process we are following requires a community benefits plan, and our plan is a draft that you can comment on.

That is what the Community Benefits Plan is for. It is a draft with open decisions, and your comments can change it. Topics under discussion include payments to the town, fire equipment and training, senior center support, tree replanting, local hiring, and road bonding. The draft is at carpenterhillpower.com/benefits/plan, and comments are open into 2027.

PILOT stands for payment in lieu of taxes. A battery project loses value on paper as the equipment ages, so ordinary property taxes shrink over time. A PILOT sets a predictable payment each year instead. Developers like it for the same reason towns do: both know what to expect. The town negotiates it, usually through the town administrator, with the Select Board and Planning Board having a say. Other towns have agreed to 20-year terms.

We do not have a Charlton figure. The six towns we looked at agreed to roughly $8,500 to $11,300 per megawatt per year. That range is only for context, and it is not a promise or an estimate for Charlton. Our tax and assessment research is still open.

We have not promised any share of a household's electric bill. Rising electricity prices are a national trend driven by higher demand. Charlton buys power in bulk, so a benefit tied to bills would have to be negotiated with the town and with National Grid. At the public meeting this was raised as one idea. Nothing is agreed.

The regional grid operator decides, not ESA and not the state, and electricity goes to the nearest demand. The project is built to support the grid as a whole. It is not built to back up individual homes.

The state does not enforce it. The plan binds the project's owner. We are discussing putting some items into a community benefit agreement between the owner and the town, which would be legally binding on the owner.

The state does not require it. We expect a supplemental meeting before it goes to the state, so that Charlton has substantial input and a way to sign off. That is not decided.

Residents proposed solar and batteries for the senior center and the police and fire stations, ongoing well testing, an escrow for takedown and failures, property value protection, extending town water lines, and replanting 15 acres of trees elsewhere in Charlton. All of these are logged as input. None is decided, and the draft has 34 open decisions.

At the public meeting, residents picked priorities for the plan. Results will be posted in October, with every paper ballot counted. We are not publishing the partial tallies shown on the screen.

No. This project has not been approved, and no permit exists. We are in the pre-filing phase, which is the best time to shape the design. The state's Energy Facilities Siting Board makes the final decision, with public comment and hearings.

Charlton's bylaw limits battery projects to 5 megawatts, and this one is 150. Because of its size, the project is reviewed by the state board, which can issue a consolidated approval covering some local permits. We know many residents object to that, and we have written it down.

The state's Intervenor Support Grant Program funds attorneys, expert witnesses, and other participation costs for eligible community groups, nonprofits, and towns, up to $150,000 per group for each proceeding. The state decides eligibility, and the process starts after the application is filed. Details are at mass.gov/info-details/intervenor-support-grant-program. We have also been asked to support the cost of a negotiator for the town, which is not decided.

The current proposal is 150 megawatts. A larger project, or a second one, would need its own state review with public comment and hearings.

Who is paying for it. Carpenter Hill Power, LLC is developed by ESA, an independently owned solar and energy storage company based in Central Florida. ESA pays the cost of early-stage development. ESA has said the project will be sold to a long-term owner and operator. Other financing details have not been published.

Whether it is treated like a power plant. A battery storage system stores electricity from the grid and sends it back when demand is high. It does not produce new power. Under state rules it is an energy facility, the same broad category that includes power plants, but it falls in a specific category: a Large Clean Energy Storage Facility, which means an energy storage system of 100 megawatt-hours or more. The state's Energy Facilities Siting Board will review the project and decide whether to approve it.

Charlton was not chosen so much as the Carpenter Hill Substation was. The 345 kV and 115 kV transmission lines meet there, and it connects eastern and western Massachusetts. Because the project connects at an existing substation, it needs only a short line to the substation and no new long-distance transmission.

Each project is considered on its own merits, and cumulative burden is taken into account. The burden is high for this census block. A cumulative impact analysis is part of the state process and will become part of the public record. If the project is built, tree clearing outside the existing New England Power (National Grid) transmission right-of-way is committed at no more than 10 acres, on a 47-acre parcel.

Learning the local habitat. ESA has met with MassDEP, MassWildlife's Natural Heritage and Endangered Species Program, and the EEA MEPA Office to learn more about the local habitat. The Natural Heritage and Endangered Species Program has asked ESA to submit a formal information request for rare species data, and state reviewers have asked for a formal wetland delineation. ESA is open and available to learn more from residents who want to share their local knowledge. Residents can do that through the Citizen Advisory Committee, public meetings, the weekly virtual office hours, or directly with Jonathan Santiago at jsantiago@esa-solar.com or 407-232-7440 ext. 251.

Engagement with the town. ESA is the developer, not the long-term owner or operator. The project is expected to be sold to a long-term owner before it is built and operated. Permits, approvals, and other legally binding project requirements continue with the project and apply to the future owner, and the Community Benefits Plan is being written to state who is responsible for each commitment, how it is funded, and how it is monitored. Until a sale, ESA attends meetings in Charlton, takes part in community outreach, works with town officials and emergency services, and continues the Citizen Advisory Committee meetings. The draft Community Benefits Plan also proposes one named community contact with a posted phone number and email. Residents will be told who the owner is once the project is sold.

Energy storage has to connect where the grid already exists, and two transmission voltages converge at the Carpenter Hill Substation, which makes it a workable connection point. Whether the site is appropriate beyond that depends on factors such as a parcel large enough for real setbacks, clearing limited to a fraction of the land, and distance from neighbors. A preliminary draft of the Site Suitability Analysis, which evaluates these factors, is available now. Read it online at https://carpenterhillpower.com/reports/site-suitability or download the PDF at https://carpenterhillpower.com/files/carpenter-hill-site-suitability-analysis-draft.pdf. The final assessment required by the state process will be part of the public filing record.

ESA has looked at essentially every substation in ISO New England, the region's grid operator, with a focus on Massachusetts, where electricity demand is highest and growing the most. A site has to meet three tests: a substation that can support storage, land that can actually be built on (many sites are wetlands or otherwise unbuildable), and a landowner who is willing to lease. Very few sites passed all three. ESA has site control at other substations as well. At others, another developer already had site control of the available land.

Site selection was led by the interconnection point, and this parcel happens to be wooded. What we control now is how much of it we disturb: no more than 10 acres of clearing outside the transmission right-of-way, roughly 5 acres fenced, and the rest of the 47-acre parcel left undeveloped. Tree replanting is already a committed item, the committee has asked us to go further, and that discussion is shaping the draft benefits plan now.

The site was identified because of the interconnection point and a willing landowner. It was not selected because it was judged the best or safest location in the region. Whether it is safe and suitable is decided by the studies and the state review, not by how the site was chosen. A preliminary Site Suitability Analysis is published now at https://carpenterhillpower.com/reports/site-suitability, along with a preliminary Cumulative Impact Analysis. The hydrology and stormwater studies, the sound study, and the gas plume analysis are committed, and an independent reviewer the town selects will review the Emergency Action Plan. The state's Energy Facilities Siting Board then reviews the project in public hearings and can approve it, attach conditions, or deny it.

The landowner benefits through a lease agreement. ESA and the project's eventual owner benefit if the facility is built and operates. The town receives tax revenue or a PILOT, a negotiated payment in lieu of taxes. The project also includes a Community Benefits Plan developed with residents.

Lightning protection. The site will have lightning protection built to NFPA 780, the national standard for lightning protection systems. That standard covers the equipment that gives a strike a safe path to the ground, such as air terminals, grounding, and surge protection. The measures are shown in the filed site plans.

Lightning transient analysis. ESA has also committed to a lightning transient analysis. This is an engineering study of how the electrical surge from a strike would travel through the site's grounding and equipment, to confirm the protection holds. The results have not been published yet and will be posted with the other safety studies.

If a fire did start. Each battery unit has built-in fire detection and automatic shutdown. UL 9540A fire testing checks that a fire in one unit does not spread to the units next to it.

Two commitments are in place. Firefighting water is to be captured on an impermeable surface so it cannot reach groundwater, and runoff along the southern boundary is to be captured. Testing and removal procedures for captured water are part of the Emergency Action Plan being developed with Charlton Fire, which an independent reviewer selected by the town will examine at the project's cost. A groundwater study and a groundwater monitoring program are also committed.

The fire water supply is being planned with the Fire Chief and will be part of the Emergency Action Plan. Charlton Fire has confirmed there is no hydrant system at the site. Options include storing water at the site to match what fire trucks can deliver. A pond is not part of the current design. Extending town water to the site is not in the current design or the draft Community Benefits Plan.

Water would come from the supply arrangement being planned with the Fire Chief. Options include water stored at the site and water brought in by fire trucks. Charlton Fire has said water would be trucked in, and that extending the water line from Route 169 is something the town could consider. That is the town's decision, and it has not been made. The planned response to a battery unit fire is also defensive: protect the surroundings and monitor the air while the unit burns out, with water used to cool neighboring equipment and not sprayed on the burning unit.

The operator must provide training to the fire department before the facility operates and every year after. The Emergency Action Plan is being built with Charlton Fire and will be reviewed by an independent reviewer the town selects and the project pays for. The draft Community Benefits Plan lists fire equipment and training. The project's position is that these costs belong to the project, not the town. The draft is not final. The planned response to a battery unit fire is defensive, with the unit allowed to burn out while the surroundings are protected.

In normal operation nothing is burned, so the facility gives off no smoke or emissions. The batteries use lithium iron phosphate, which has no cobalt or nickel. The concern is a fire. Smoke from a battery fire can contain carbon monoxide and hydrogen fluoride. A gas plume analysis is committed and has not been published, so no road or home can be described as unaffected yet. The site is to have spill containment and stormwater management, firefighting water is to be captured on site, and a groundwater monitoring program is committed.

In the newer Tesla Megapack 3 design, the explosion vents sit in the doors with internal diverters, so water that gets in runs down the inside of the door and not onto the battery modules. This design change was made in response to a failure at another site in which stormwater entered through improperly installed panel gaskets. Whether the units have dedicated water-intrusion sensors has not been published. Final equipment details will be confirmed in the plans filed with the state.

Water on the equipment area, including firefighting water, is to be captured on a hard surface and directed to containment so it does not soak into the ground. Water that has passed through equipment in a fire could carry contaminants, which is why capture is committed. Test results on that water have not been published. Disposal procedures are part of the Emergency Action Plan, and the groundwater monitoring program would check for any impact.

How the sensors are powered, and what backup power supports them, has not been published and is an open item in the Emergency Action Plan. The design is passive in a fire: UL 9540A fire testing checks that neighboring units stay within a safe temperature range through insulation alone, without power or air conditioning. Responders are to have real-time temperature data from a 24-hour network operations center and a local command center.

The cabinets are built for outdoor use. In the newer design the explosion vents are in the doors with diverters, so rain or snow that enters is directed down the inside of the door and away from the electronics. The battery modules carry an ingress protection rating against dust and hose-directed water. Final equipment details will be confirmed in the plans filed with the state.

Budget and direct aid. Carpenter Hill Power will maintain liability insurance for the project. The project is still in preliminary development, so coverage limits and policy details have not been finalized and no dollar amount can be given. There is currently no separate budget for direct resident relief outside applicable insurance coverage or government programs. Obligations and available resources would depend on the circumstances of an incident, the applicable insurance policies, and the legal requirements in effect at the time. The draft Community Benefits Plan proposes additional protections for close neighbors, including well testing and property value protection within 1,000 feet of the work limit. Those are drafts and not yet commitments.

Insurance rates. ESA is not aware of evidence that proximity to a battery energy storage facility, by itself, raises residential insurance premiums. Homeowners' rates are generally based on factors specific to the property, such as construction, age, claims history, and proximity to emergency services.

That determination is the Fire Chief's to make, not ours. We are in active working sessions with the Fire Chief, the emergency management plan is being developed with the department, and, as announced publicly on August 4, the town will select an independent third party, paid for by us, to review that plan.

This costing is underway with the Fire Chief now, covering equipment, training beyond code requirements, and mutual aid over multi-year horizons. Our position is that costs the facility creates belong to the project, not the town, for the life of the facility, including equipment replacement as it ages. NFPA 855, the national fire code governing these facilities, already requires initial and annual responder training as a code obligation, so ongoing training is a baseline requirement rather than a negotiated addition. The current plan work covers funding it and going beyond that baseline.

This is one of the central design questions in the current emergency planning work. Options under discussion include on-site water storage and equipment matched to how the Charlton Fire Department operates, such as tanker capability. The answer will be documented in the emergency management plan and the site design, both subject to independent review.

The choice between evacuation and shelter-in-place, the distances involved, and the triggering conditions are being determined in the emergency management plan, informed by the plume modeling. Neither is finalized yet. Both will be complete before we file, and the plan will receive independent review by the town's selected expert.

Authority for this rests with Charlton's public safety officials, meaning the fire chief and the town's emergency management structure, not the project or its operator. The notification process, including who notifies residents and how quickly, is part of the plan currently in development, and it will be reviewed by the town's independent expert before residents are asked to rely on it.

Yes, independent review is committed, with the reviewer selected by the town and paid for by us. The plan is being completed with the fire department before we file, and the state review that follows is public and formal.

Carpenter Hill Power is a battery storage facility, not a power plant that needs a continuous supply of water to generate electricity. Each battery unit has its own liquid cooling system. The project is not expected to need an ongoing supply from Charlton's drinking water system for normal operation. Cooling and water use details have not been published. The hydrology and stormwater studies are committed and will be published, and a groundwater monitoring program is committed.

Keeping the water supply and its quality protected. Normal operation is not expected to draw on the town's drinking water. Plans for erosion control, stormwater management, and groundwater monitoring are being developed. Spill containment is planned, and firefighting water is to be captured on site, not released to groundwater or drainage areas. The detailed hydrology and stormwater studies are still being completed and will be made available when they are.

Compensation. The draft Community Benefits Plan proposes that the project pay to test eligible private wells within 1,000 feet of the work limit, and that if a test shows a change linked to the site, the project pay for bottled water within 48 hours and for treatment or a replacement well. This is a draft and not yet a commitment. No promise has been made on electricity costs or accessibility. The draft plan is the place to define what counts as a negative impact, and comments on it are open into 2027.

Not yet. The hydrogeologic study is committed and underway, and it will be published when it is complete. A well inventory within one mile is complete, and a door-to-door survey within half a mile is next. A meeting with MassDEP, the state's environmental agency, on groundwater, well locations, stormwater, and erosion control was scheduled for late August, and a public report on it is committed.

Engagement is happening before the studies finish so that residents' questions can shape what the studies examine, rather than arrive after the fact. The safety plume modeling will be completed before the Community Benefits Plan is finalized; the plan will not close while the key studies are still open.

The hydrogeologic study includes a well inventory, and the published study will include the counts and mapping requested. The inventory within one mile is complete, and the door-to-door survey within half a mile is next.

A damaged battery could vent hydrogen, carbon monoxide, and other hydrocarbons, along with smaller amounts of hydrogen fluoride and related fluorinated compounds from the electrolyte and binder. The facility's LFP chemistry does not contain cobalt or nickel, but that does not remove this risk, since it originates in a different part of the cell. A damaged transformer could release its dielectric oil, typically mineral or synthetic ester and not PCB-containing in modern equipment. Damaged cooling equipment could release glycol coolant or a fluorinated refrigerant. Firefighting operations mainly risk contaminated runoff carrying dissolved metals, fluoride, and soot particulates, which is why on-site containment and boundary drainage measures are already committed.

Two commitments are already in place: water used to fight a fire will be captured on an impermeable surface so it cannot reach groundwater, and runoff along the southern boundary will be captured. Testing and removal procedures are part of the emergency management plan being developed with the Charlton Fire Department, which the town's independently selected reviewer will also examine, at no cost to the town.

Yes. Standard practice for battery fires is a defensive response: disconnect the unit electrically, protect the surrounding area, monitor the air, and allow a damaged unit to burn out its stored energy rather than send personnel in to fight it directly. This approach follows industry and fire-service guidance developed after firefighter injuries at a battery facility in Arizona in 2019. Water is still used to cool nearby equipment and protect adjacent units, which is why the site's containment is engineered for it. The water supply approach, in a town without comprehensive public water, is being developed with the Fire Chief, including equipment suited to how the Charlton Fire Department responds. Water volumes and runoff routing will come from that plan and the site engineering, both of which will be public.

The draft Community Benefits Plan, released September 30, proposes that the project pay to test every eligible private well within 1,000 feet of the work limit before construction, so each household has a baseline. Wells downhill of the site on T. Hall Road and any well the Board of Health identifies as downgradient are also covered. Testing would repeat once during construction and once within 12 months after construction ends. The plan is a draft, and well testing is among its open decisions.

Groundwater monitoring at the site itself is committed. For residents' wells, the draft Community Benefits Plan proposes testing at the project's cost before, during, and within 12 months after construction, and again after any incident on the site, after blasting near a well, or at the request of the Board of Health. Whether testing would continue for the facility's full operating life is not decided.

If a well were affected, the draft Community Benefits Plan proposes that the project pay for bottled water within 48 hours and for treatment or a replacement well if a test shows a change linked to the site. This is a draft and not yet a commitment. The project is also to carry pollution liability insurance during construction and operation, and under Massachusetts law cleanup responsibility for contamination rests with the site's owner, regardless of fault. The emergency response plan defines how a release would be contained and addressed.

Water protection must stay with the project through agreement terms that bind future owners, permit conditions, or secured funds, because ownership is expected to change. Our position on the record is that well-water protection belongs among the items that receive binding treatment. The specific instrument will be determined through the plan process and the town's negotiation, supported by its own experts.

The current design limits clearing outside the transmission right-of-way to no more than 10 acres of the 47-acre parcel, and the fenced battery area is about 5 acres or less. Existing vegetation is to be kept where possible and used to screen the facility. State reviewers have asked for a formal wetland delineation and a formal information request on rare species during design. A full wildlife and habitat plan has not been published.

Habitat restoration, tree replanting, additional screening, and a conservation fund are Community Benefits Plan topics. They are under discussion and are not promised yet. ESA has not committed to specific programs or funding amounts before hearing from Charlton about what would be most valuable, and the project is looking at opportunities to work with local conservation organizations. The decommissioning bond, required before construction, covers restoration so it does not fall to the town or residents.

The project will have visual and environmental impact. The design keeps battery equipment under 10 feet tall, sets it back from homes, and keeps existing trees for screening where possible. The nearest home is the landowner's, about 500 feet from the equipment area, which is well beyond the 200-foot minimum residential setback. Viewshed and acoustic studies are being completed and will inform the final design and mitigation. Erosion controls, stormwater management, and the limit of 10 acres of clearing outside the transmission right-of-way are committed, and construction traffic will be planned with the town.

After construction, protections for close neighbors, including screening, noise, night sky, and property value, and a structured post-construction review are Community Benefits Plan topics. They are under discussion and not promised yet. Tree replanting is a committed item, and the decommissioning bond covers removal and site restoration.

Measured background levels are the foundation of the sound study, which is committed and in progress. They will be presented in the published study rather than stated in advance of it.

This is what the sound study will produce: predicted levels, home by home, under maximum operating conditions, including tonal character, low-frequency sound, and worst-case rather than average conditions. The study's scope is set by the acoustic professionals conducting it, independent of both the project and any single submission.

These are standard inputs for an acoustic assessment of this kind, and the published study should address each of them. The study's scope is determined by the acoustic professionals conducting it, independent of both the project and any single submission, which is part of what makes the result credible.

Enforceable noise limits are set as permit conditions in the state siting process, informed by Massachusetts noise policy. They bind whoever owns the facility and are enforced by regulators. A structured post-construction review is a standing plan topic, since residents have said commitments need to be checked after construction is complete. How noise complaints are investigated, by whom, and with what consequences will be specified rather than left undefined.

This is not yet committed. It is a specific and checkable request, now part of the plan discussion, and the draft plan will answer it directly.

The draft Community Benefits Plan proposes that if a home within 1,000 feet of the work limit sells for less than an independent appraisal says it is worth without the facility, the project pays the difference, up to a cap that is still to be set, for five years after commercial operation. This is a draft and not yet a commitment. Separately, the project has offered a property value study by a Massachusetts-licensed appraiser, comparing properties near comparable operating projects with similar properties farther away, published so residents can review the evidence directly.

The rainfall comparison describes loudness, offered because a decibel number alone means little to most people without a familiar reference. It does not describe duration, and duration is what matters most to someone living near a continuous source. The facility can produce sound at night. Predicted levels at the nearest homes will come from the sound study that is now in progress.

These figures will come from the committed sound study now in progress. We will not characterize the sound's significance before the study is complete. The study will be published in full.

This is a records exercise rather than a study, and it can be answered directly. We will produce and publish the count of homes at each distance band requested, along with the private well counts requested above.

A sound contour map showing residences is a standard output of a professional acoustic assessment, and the published study is expected to include one.

Increase over background is the appropriate measure, and it requires the measured baseline first. Both the baseline and the resulting increase, home by home, will be included in the published study.

Tonal character, low-frequency sound, vibration, and maximum-condition analysis are standard elements of an acoustic assessment for a facility of this kind, and we expect the published study to address each. An average alone can understate what a resident experiences at specific times, such as at night, so the study needs to go beyond averages to answer that question.

These are recognized inputs to an acoustic assessment, and the published study should address each condition or explain why not. The scope itself remains with the professionals conducting the study, which keeps it independent of both the project and any single submission.

Measuring only at the property line would not answer what residents will actually hear at home, so measurement locations need to reflect that. Choosing specific measurement locations is a decision for the acoustic professionals, but the published study will state where measurements were taken and why.

Yes, this equipment can operate at night. Cooling runs according to battery needs, charging and discharging follow grid demand, and transformers remain energized continuously. This is why nighttime modeling and nighttime limits are part of the study and the permit conditions.

Enforceable limits are set as permit conditions in the state process, informed by the study and Massachusetts noise policy, and they bind whoever owns the facility. A specific nighttime limit does not exist yet, since the study that establishes it is not complete. Proposed limits will be public, and residents can contest them during the review.

The complaint investigation process is being defined in the plan's accountability framework and the post-construction review topic, and it will name a party independent of the project.

If operation exceeds permit-condition limits, compliance is mandatory and enforced by the permitting authorities against whoever owns the facility at the time. Noise that remains within limits but is still disruptive is a separate question, addressed through the plan's neighbor-protection and post-construction review items rather than through the permit alone.

A curtailment provision would need to be established through enforceable terms negotiated with the town's experts. Raise it during the plan comment period and the state review, where it would bind whoever owns the facility.

Design-stage mitigation, including equipment selection, orientation, and barriers, is guided by the sound study and is significantly less costly to adjust before the design is finalized this fall than afterward. That is why raising these issues now can still influence equipment decisions. Remedies after operation begins, including modifications, barriers, or compensation for documented impacts, are not yet resolved and belong in the neighbor-protections discussion, where any offered remedy will need to state its trigger, its remedy, and how it is enforced.

The facility is planned for an operating life of 20 to 35 years. The batteries use lithium iron phosphate, which has no cobalt or nickel. Recovery rates vary by component and processor, and the recycling industry is likely to look different when the facility is decommissioned. A decommissioning plan is required and is filed with the application, covering removal and disposition. Verification of the final disposition of the batteries will be built into the decommissioning conditions. The decommissioning bond is posted before construction.

No. The facility is built to support the regional grid as a whole and is not built to back up individual homes or home batteries. In a blackout, the regional grid operator decides where electricity goes, and it goes to the nearest demand. Residents have asked about bill credits and other direct energy benefits. No such benefit is promised, and none is agreed.

Local hiring and businesses. Local hiring and the use of local businesses are Community Benefits Plan topics, and no commitment has been made yet. ESA has met with the Central Massachusetts Workforce Board and Bay Path Regional Vocational School about workforce development and employment. ESA is exploring ways to work with local contractors, tradespeople, suppliers, and service providers during construction and, where appropriate, over the life of the facility. Residents are invited to say what they would consider a meaningful local hiring commitment.

Conservation groups. Funding local conservation work is a plan topic and is not promised. If the community considers it valuable, it will be evaluated through the Community Benefits Plan.

Oversight board. The Citizen Advisory Committee is open to any resident, meets regularly, and posts its materials and notes. Its charter and roster are published in the Document Library. The draft plan proposes keeping the committee open for the life of the facility, with an annual public review of what was delivered.

Defining community needs. Charlton residents define them. Benefits are decided through the Community Benefits Plan process, shaped by residents and the committee, and the town and the project decide together which items go into a signed agreement.

No figure is agreed yet. Our tax and assessment research is underway and will be published. The PILOT will be negotiated by the town, with independent expert help of the town's own choosing, paid for by us; it is not an offer for the town to simply accept. Signed PILOT agreements from Carver, Medway, Tewksbury, Revere, and Chelsea are already in the public document library.

A PILOT payment goes into the town's general fund and is not paid to households, so a per-household figure would not describe what residents receive. How the town uses the payment is the town's decision.

We are working with the Fire Chief on cost estimates for the fire department over three- and five-year horizons. The project's position is that costs the facility creates, including equipment replacement and ongoing training, belong to the project, not the town. The draft benefits plan will list each item with its funding source stated.

A storage facility does not lower Charlton electric bills directly. It supports the reliability of the regional grid, an effect that is spread across the region rather than visible on an individual bill.

Tax or PILOT revenue to the town, and the Community Benefits Plan being built from priorities residents identified, including the senior center, conservation, recreation, education, and neighbor protections. The draft plan, released September 30, lists each benefit under discussion. It has 34 open decisions, and comments are open into 2027.

A facility like this generates substantial construction work, then operates with a small permanent staff supported by round-the-clock remote monitoring. Exact staffing numbers will be included in the application. Local hiring and trades participation during construction is one of the plan topics under development, and we have begun discussions with the regional workforce board and building trades organizations.

The draft Community Benefits Plan was released on September 30, and comments are open into 2027. The plan will be submitted with the application and becomes part of the formal state review record. State guidance also describes a community benefits agreement, a negotiated, legally binding contract that the state encourages and that can take effect when a project is approved. Which items in Charlton's plan move into a binding agreement is a matter for negotiation between the town and the project.

ESA develops projects, and this facility is expected to have a different long-term owner. For that reason, the protections that matter are attached to the project entity, Carpenter Hill Power LLC, rather than to us. Permit conditions bind whoever holds the permit. The decommissioning bond is posted before construction and stays with the project. Agreement terms bind future owners.

The state process requires a site suitability assessment and, where applicable, a cumulative impact analysis under the siting regulations, both of which become part of the public record. On property values, we have offered a study by a Massachusetts-licensed appraiser comparing matched pairs of properties near comparable operating projects.

The plan is being drafted so that each funded item states its purpose, amount, recipient, and how it is enforced, and a public tracker shows whether the project delivers on it. Committee members have told us that specificity is what distinguished past promises that were kept from those that were not, and the plan is being drafted to that standard.

The decommissioning bond is the primary protection. It is posted before construction, sized by an independent published estimate, updated on a schedule, and not reduced for assumed scrap value. The bond funds removal even if the owner does not complete it. Permit conditions govern operation and maintenance regardless of ownership.

Few grid-scale lithium battery facilities anywhere have ten years of operating history, since the industry at this scale is younger than that. We can provide Massachusetts projects now in service, including Carver's 150 MW facility, online since 2025, along with their agreements, already in our public document library, and safety and incident data from the national fleet. We are compiling additional comparable-project materials residents have requested, including items submitted by committee members. The property value study described in the property value answers uses matched pairs of homes near operating projects and is the strongest evidence available on that question.

This project has not been approved, and no permit exists. The project is in the pre-filing phase, which is the best time to shape the design. The state's Energy Facilities Siting Board makes the final decision. Its process includes formal public comment periods and hearings where residents and groups can take part on the record, and the state's Intervenor Support Grant Program can fund attorneys and expert witnesses for eligible groups. Comments on the draft Community Benefits Plan are open into 2027, and every comment is logged and receives a written response.

The facility is not designed as backup power for homes. It supports the regional grid by storing electricity when supply is high and returning it when demand peaks.

The estimate will be produced by an independent party and published, not generated internally, and it will be re-estimated on a set schedule across the facility's life so the figure stays current. The specific number does not exist yet; the commitments to an independent estimate, publication, and scheduled updates do.

Yes. The decommissioning bond is committed to be posted before construction, sized by the independent estimate, with no reduction for assumed scrap value. The specific form of the instrument and the town's access to it will be set during the approval process, in which the town participates with its own counsel and experts, at our cost.

The decommissioning bond covers this situation. It is posted before construction and is meant to stay with the project rather than the owner, so a sale does not remove it. The financial protection is funded up front and attached to the facility rather than to any particular owner, including ESA, because ownership is expected to change over time. The specific form of the instrument is set during the approval process.

Recovery rates vary by component and by processor, and the recycling industry will likely look different by the time this facility is decommissioned decades from now. What is committed is a decommissioning plan, filed with the application, covering removal and disposition. Verification of final battery disposition is a specific requirement we will build into the decommissioning conditions.

Removal and site restoration are covered by the decommissioning plan and bond, and tree replanting is already a committed item on the project record. The decommissioning plan filed with the application will state the restoration standard in enforceable terms.

Environmental liability under Massachusetts law does not end when a facility closes. That default standard still requires a resident to establish the claim and wait for resolution, which is not sufficient on its own. Discovery after closure will be addressed within the same enforceable framework as the late-discovery question above, with its mechanism stated in the draft plan and the decommissioning conditions.

No decision is being requested on the basis of benefits that have not been quantified. The studies, financial commitments, emergency plans, and agreements described in these answers are being completed and published, and decision points come after they exist. Engagement continues while the studies are underway so that residents' input can shape them. Every commitment is listed on the public tracker at carpenterhillpower.com, with a status that can be checked at any time.

Yes. The July mailer arrived late for many residents, and ESA apologized for that. Since the July 8 meeting, the project has held Citizen Advisory Committee meetings on August 4 and September 10, and two sessions of a public meeting on September 30 at Dexter Hall, for which notices were mailed to residents in late August. A third public meeting is planned for November. The date and venue will be mailed and posted at least a month ahead.

The draft Community Benefits Plan was released on September 30 and is at carpenterhillpower.com/benefits/plan. Comments are open into 2027. The committee's charter and roster are published in the Document Library. The committee's priorities are reflected in the draft plan and in the engagement log, which records what was heard at each meeting and what was done.

Meeting dates, times, and links are on the homepage of carpenterhillpower.com, and RSVPs are made through the site or by emailing jsantiago@esa-solar.com or calling 407-232-7440 ext. 251.

In-person meetings do not have an online link. For virtual meetings, the link, meeting ID, passcode, and call-in numbers are on the homepage, in the meeting emails, and in each RSVP confirmation. If a link or passcode does not work, call Jonathan Santiago at 407-232-7440 ext. 251 for help joining.

Meeting times are listed on the homepage and in each meeting email. The next opportunity to talk with the team live is the first weekly virtual office hour, on Wednesday, October 14, at 1:30 p.m. Eastern.

Select Participate in the menu at the top of carpenterhillpower.com. It goes to the Participate section of the homepage, which has the email sign-up, the comment form, and advisory committee information.

No study yet answers this for a fire. We have committed to a groundwater monitoring program with terms in writing before construction starts, and to publish the hydrology and stormwater studies. A well inventory within one mile is complete, and a door-to-door survey within half a mile is next. If you rely on a private well, send us your road so we can check it against the site plans, and we add wells to our list each time someone notifies us.

Trees slow and store water during a storm. Part of the area is already inside National Grid's easement. We have committed to no net increase in runoff and to no wetland fill. Soils on the site drain poorly, so water tends to run across the surface, and water also flows onto the site from the north. The design being developed uses basins on both the north and south sides, sized for storm events. We have not published the engineering numbers. Our mapping shows rain that lands on the equipment area draining south into a chain of wetlands. That covers surface water only. It does not tell us about groundwater.

Not yet answered in full. It has not been decided whether blasting is needed. There is ledge on both sides of the site, and the engineering that determines how much rock must be removed has not been published. Rock can sometimes be removed by hammering or ripping instead of blasting, and that choice is made in the construction plan. Blasting can send vibration through rock, and how far that matters depends on the amount of rock removed, the distance to a well, and the local geology. No study yet shows whether any well would be affected.

If blasting is used, these protections apply or are proposed:

• State rules. Blasting in Massachusetts requires a permit from the local fire department under 527 CMR 1.00, a licensed blaster, and a blasting plan reviewed by the Fire Chief. Property owners within 250 feet of a blast must be offered a free pre-blast survey, and vibration is monitored with seismographs during blasting.
• Draft Community Benefits Plan. The draft proposes testing private wells within 1,000 feet of the work limit, plus wells on T. Hall Road, at the project's cost before construction. Those wells would be tested again after any blasting near a well. If a test shows a change linked to the site, the project would pay for bottled water within 48 hours, then for treatment or a replacement well. The draft is not final.

Wells about a mile from the site are outside both distances. The hydrogeologic study and the well survey are meant to show which wells need to be part of this work, and their results are not published. If you rely on a private well, send us your road and we will check it against the site plans and the well records.

Fire experts advise against spraying water on a burning battery unit. The response being planned is defensive: keep people back, protect the surroundings, and monitor the air while the unit burns out. It is not "doing nothing." Firefighters would work to keep the fire from reaching anything else, and the test reports show why a unit can be left to burn out. In the most extreme test on the Megapack 2 and 2XL, the fire stayed in one cabinet.

Water is still used. It can cool equipment next to the burning unit, and a water spray can help knock down smoke from the plume. It is kept off the burning unit itself, because water that touches it can pick up contaminants. Any firefighting water used is captured on site.

Firefighting water would be needed at the site, not on your road. We have committed to capture firefighting water on site, on a hard surface, so it cannot reach groundwater. We have also committed to plan the fire water supply with the Fire Chief. Storing water at the site to match what fire trucks can deliver is one option. Charlton Fire has confirmed there is no hydrant system at the site and that water would be trucked in, or the town could consider extending the water line from Route 169. That is the town's decision and it has not been made.

Smoke from a battery fire can contain carbon monoxide and hydrogen fluoride, and even small amounts of hydrogen fluoride can be harmful. It is a real hazard close to the fire, mainly for firefighters and anyone nearby.

What has been measured at other fires is reassuring but limited. A September 2026 report by Fire & Risk Alliance, an independent fire engineering firm, reviewed air monitoring at seven U.S. battery fires, plus the January 2025 fire at Moss Landing, California. At the fires where air was sampled, including in nearby communities, nothing was found above public health limits. At Moss Landing, six days of community air monitoring detected no hydrogen fluoride. The report also explains why: hydrogen fluoride dissolves in water, sticks to surfaces and smoke particles, and is diluted by air as smoke travels. The incident review it draws on was commissioned by the American Clean Power Association, the industry trade group. These were other sites with other equipment, and the sampling covered air only, so this does not tell us what would happen here.

We have committed to publish a gas plume analysis, which looks at where smoke and gas could travel. We have not published it yet, so we cannot tell you that any road or home would be unaffected.

Some residents describe their road as sitting in a valley. Hills, wind, and temperature all change where smoke goes, and we cannot answer this from a map alone. That is what the gas plume analysis is for, and it needs to account for the ground between the site and nearby roads. It has not been published, so no road can be described as safe or unsafe yet.

The Emergency Action Plan is where evacuation and shelter-in-place decisions belong. It is not published yet. Residents raised two specific problems at the public meeting: Route 20 backups on holidays and in snow that could slow fire trucks from other towns, and narrow rural roads with one way out. We wrote both down for the plan.

Staffing at the fire department is a town matter, and we do not comment on it. What we have said in writing is that the Fire Chief decides what capacity the facility needs, that the project covers the costs it creates, and that the Emergency Action Plan is being built with Charlton Fire and reviewed by an independent reviewer the town selects and the project pays for. The operator must provide training to the fire department before the facility operates and every year after, and Charlton Fire has said it would bring in neighboring departments for a large incident, with tours and practice exercises beforehand. The draft Community Benefits Plan also lists fire equipment and training.

Private wells are a leading concern raised at every public meeting. Firefighting water is to be captured on a hard surface so it cannot reach groundwater, and runoff along the site's southern boundary is to be captured. A groundwater monitoring program is committed, with its terms in writing before construction starts. A hydrogeologic study is underway, and a well inventory within one mile of the site is complete. A door-to-door survey within half a mile is next.

The draft Community Benefits Plan proposes testing eligible private wells within 1,000 feet of the work limit, plus downhill wells on T. Hall Road and any well the Board of Health identifies, at the project's cost. Wells farther away are not named in the draft. Residents who rely on a private well farther out are asked to send their road so it can be checked against the site plans and the well records.

Water use, wastewater, and chemical storage. Water use details have not been published. The facility is not a power plant and is not expected to need an ongoing supply from the town's drinking water for normal operation. Wastewater and chemical storage information has not been published. The only significant liquid in each battery unit is the coolant in its cooling system, and the coolant type has not been specified. The hydrology and stormwater studies are committed and will be published.

Stormwater, wells, and aquifers. The design being developed uses basins sized for storm events, with a commitment to no net increase in runoff and no wetland fill. A hydrogeologic study with a well inventory is underway. The draft Community Benefits Plan proposes testing wells within 1,000 feet of the work limit, with baseline testing before construction and retesting during and after it.

Emergency response. The Emergency Action Plan is being built with Charlton Fire and will be reviewed by an independent reviewer the town selects and the project pays for. It is not published yet.

Independent review and monitoring. The Energy Facilities Siting Board conducts the state review, which includes public hearings and environmental review. An independent third-party review of the Emergency Action Plan is committed. A separate independent review of the groundwater study has not been committed. Groundwater monitoring at the site is committed, with its terms in writing before construction. The state's Intervenor Support Grant Program, up to $150,000 per group for each proceeding, can pay for expert witnesses.

Financial assurance and accountability. A decommissioning bond is required before construction and stays with the project through any change of ownership. Pollution liability insurance is to be carried during construction and operation, and Massachusetts law keeps cleanup responsibility with the site's owner. Permit conditions bind any future owner. The decommissioning bond covers removal and restoration so the cost does not fall to the town.

The process. The project is in the state's required pre-filing engagement phase, with public meetings, a Citizen Advisory Committee, published records, and a comment period on the draft Community Benefits Plan that runs into 2027. Every comment receives a written response. A cumulative impact analysis, which looks at what is already in the area, is part of the state process and is in preparation.

Data center. No, this is not a data center. Carpenter Hill Power is a battery storage facility. It stores electricity from the grid and releases it when demand is high. It does not generate power or burn fuel. The only data processed is for monitoring and controlling the operation of the system.

Air, water, and noise. In normal operation the facility gives off no smoke or emissions. Water use details have not been published. The main sound in operation is a steady hum from the cooling units, inverters, and transformers, and the sound study is in progress.

Light and views. A lighting plan has not been published. Night sky, screening, and noise for close neighbors are Community Benefits Plan topics under discussion. The equipment is under 10 feet tall and set back from homes, and existing trees are kept for screening where possible. It is still industrial equipment on a rural parcel.

Taxes. The town is expected to receive standard property taxes or a payment in lieu of taxes negotiated with the town. Tax and assessment research is in progress, and no figures have been published.

The project is industrial equipment on a rural parcel. The design keeps clearing outside the transmission right-of-way to no more than 10 acres of a 47-acre parcel, keeps equipment under 10 feet tall and set back from homes, and keeps existing trees for screening where possible. Close-neighbor protections, including screening, noise, and night sky, are Community Benefits Plan topics under discussion. Comments on the draft plan are open into 2027.

Research on battery storage and property values is still emerging. Based on current data, properly screened and set-back facilities have shown negligible impact, but no Charlton data exists yet. The project has offered a property value study by a Massachusetts-licensed appraiser, comparing properties near comparable operating projects with similar properties farther away, published so residents can review the evidence. The draft Community Benefits Plan also proposes that if a home within 1,000 feet of the work limit sells for less than an independent appraisal says it is worth without the facility, the project pays the difference, up to a cap still to be set, for five years after the facility begins operating. This is a draft and not a promise. Benefits to Charlton are being shaped through the Community Benefits Plan, which has 34 open decisions.

Noise. Early noise screening, based on stand-in equipment data, found that the two closest property lines would be louder than the state noise policy allows. Fixes, including a sound wall, are being tested, and a full sound study is next. Enforceable noise limits are set as permit conditions in the state process and bind any owner. A post-construction review is a Community Benefits Plan topic. Anyone who wants to discuss this directly can reach Jonathan Santiago at jsantiago@esa-solar.com or 407-232-7440 ext. 251, or join the weekly virtual office hours starting October 14.

Wildlife and nearby natural areas. Clearing outside the transmission right-of-way is limited to no more than 10 acres, and state reviewers have asked for a formal wetland delineation and a rare species information request. Project mapping shows rain that lands on the equipment area draining south into a chain of wetlands, not into Cady Brook. A detailed project location map and a preliminary wetlands index are in the Document Library. For exact distances to a specific natural area, contact Jonathan Santiago.

Environmental impact. The project requires site development, vegetation clearing, and stormwater management. Clearing outside the transmission right-of-way is limited to no more than 10 acres of a 47-acre parcel. Hydrology and stormwater studies, a sound study, a cumulative impact analysis, and a site suitability analysis are part of the state process and will be public. State reviewers have asked for a formal wetland delineation and a rare species information request.

Local benefits. The facility supports the regional grid, not only Charlton, and local benefits come through the Community Benefits Plan, which residents are shaping. Topics under discussion include payments to the town, fire equipment and training, senior center support, tree replanting, local hiring, and road bonding. The draft plan has 34 open decisions, and comments are open into 2027.

Long-term stakeholders and local voice. ESA expects to sell the project to a long-term owner. Permit conditions, the decommissioning bond, and the commitments in the public tracker are written to bind any future owner. Residents have a role in the Citizen Advisory Committee, at public meetings, in the comment period, and in the state's formal hearings.

Independent review. The Energy Facilities Siting Board conducts the state review, which includes public hearings and environmental review. An independent third-party review of the Emergency Action Plan is committed, selected by the town and paid for by the project.

The mailer. The July mailer arrived late for many residents, and ESA has apologized for that. Notices for the September 30 meeting were mailed in late August, and a month's notice is committed for future public meetings.

The July 8 meeting. Residents have asked for a more organized presentation with time for questions at public meetings. The September 30 meeting was held in two scheduled sessions with a presentation and question time. Residents also asked for longer meetings, technical experts in the room, and a different venue, and those requests are being taken into account for future meetings.

Zoning. Charlton's bylaw limits battery projects to 5 megawatts, and this one is 150. Because of its size, the project is reviewed by the state's Energy Facilities Siting Board, which can issue a consolidated approval covering some local permits. Many residents object to that, and the objection is recorded. The state process includes public comment and hearings, and the town can take part.

Another in-person public meeting was held on September 30 at Dexter Hall, and a third public meeting is planned for November. The date and venue will be mailed and posted at least a month ahead.

School and training ideas are part of the Community Benefits Plan conversation, including early talks with Bay Path Regional Vocational School about students in trades programs. A STEM program would be one more idea for that discussion. Nothing is decided. Ideas can also be sent directly to jsantiago@esa-solar.com.

The suggestion is recorded. Project information is currently shared through carpenterhillpower.com, the project email list, mailers, public meetings, and weekly virtual office hours starting October 14.

Some studies are still underway, and results are published as they are completed. The Document Library has maps, the site plan, the draft Community Benefits Plan, and other reports. The engagement log records what was heard and done at each meeting, and the commitment tracker lists each promise with its status. Questions can be asked at any time through the website, by email, or at the weekly virtual office hours starting October 14.

The comment is recorded. Environmental protections and the benefits to Charlton are being shaped through the studies required by the state process and the Community Benefits Plan, and the draft plan is open for comment into 2027. The project has not been approved.

The comment is recorded in the engagement log. The project has not been approved, and the state's Energy Facilities Siting Board makes the final decision after public comment and hearings.

The comment is recorded in the engagement log. The project has not been approved, and the state's Energy Facilities Siting Board makes the final decision after public comment and hearings.

The comment is recorded in the engagement log. Charlton's bylaw limits battery projects to 5 megawatts, and this one is 150, so the state's Energy Facilities Siting Board reviews it and can issue a consolidated approval covering some local permits. Many residents object to that, and the objection is recorded. The state process includes public comment and hearings, and the town can take part. Residents can comment on the draft Community Benefits Plan into 2027, and every comment receives a written response.