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Get a Free QuoteThe SREC programs are closed to new enrollment, but legacy SREC II payouts continue through 2028 and Class I RECs remain the monetization backbone for MA commercial solar outside of SMART. Here is how the policy actually works, and how to decide whether to retire or sell.
SREC I and SREC II are closed to new commercial solar in Massachusetts. SREC II legacy systems enrolled 2013-2018 continue generating SREC II certificates for a 10-year eligibility window, with the last enrollments expiring in 2028. For new commercial projects, the two monetization pathways are the SMART tariff (utility takes the Class I REC in exchange for a fixed $/kWh payment) or non-SMART self-ownership where the owner retains and either retires or sells Class I RECs into the MA RPS compliance market. The 2026 ACP ceiling for Class I is approximately $78/MWh. The retire-vs-sell choice is a governance decision tied to Scope 2 pledges, SBTi targets, and FTC Green Guides exposure, not an installer sales question.
Understanding the Massachusetts solar policy ladder is essential for anyone evaluating a commercial REC strategy. The state has moved through three distinct incentive regimes, each with different REC ownership rules.
Massachusetts first solar carve-out program. Systems earned tradable SRECs with a market-based price floor and ceiling. Closed to new enrollment at 400 MW capacity cap.
Second generation solar carve-out with sector-based SREC factors for rooftop, commercial, community, and landfill projects. Each qualified system earns SREC IIs for 10 years from commercial operation date. Last SREC II systems enrolled in 2018 reach end of eligibility in 2028.
DOER transitioned policy design from SREC carve-outs to a declining-block feed-in tariff. Some projects were caught in timing gaps, leading to safe-harbor provisions.
Utility-administered tariff replaced the market-priced SREC model. Under SMART, the utility takes the Class I REC attribute in exchange for a fixed $/kWh payment for 20 years.
Flat-incentive SMART with expanded adders and 3,200 MW statewide allocation. The utility still keeps Class I RECs. Commercial owners seeking to retain RECs must opt out of SMART.
Bottom line: If you enrolled before 2018, you may still be generating SREC II revenue. If you are planning a new project, SRECs are not on the table. Your choice is SMART (utility keeps the REC) or non-SMART self-ownership of Class I RECs.
Under the Massachusetts Renewable Portfolio Standard, every retail electricity supplier serving MA load must retire a growing percentage of Class I RECs each year. Class I covers new renewable generation built after 1997, including solar, wind, small hydro, and certain biomass. The annual RPS percentage steps up under 225 CMR 14 until it reaches 80% by 2050.
Retail suppliers (Eversource Basic Service, competitive suppliers, municipal aggregators) purchase Class I RECs to meet their annual surrender obligation. They source RECs from:
Separate from compliance, corporations and individuals buy RECs voluntarily to make renewable claims. MA Class I RECs occasionally move into voluntary buyers but most voluntary demand is served by:
Compliance-grade MA RECs almost always trade higher than voluntary-only RECs because the ACP ceiling and mandatory demand provide a price floor.
The Alternative Compliance Payment sets the functional ceiling on Class I REC market prices. A supplier never pays more per REC than the ACP because paying the ACP is always an alternative. The DOER adjusts the ACP annually by CPI under 225 CMR 14.
| Compliance Year | Class I ACP | Context |
|---|---|---|
| 2022 | $49.96/MWh | Pre-high-inflation baseline |
| 2023 | $60.30/MWh | Post-CPI step-up |
| 2024 | $66.39/MWh | CPI adjustment continues |
| 2025 | $73.50/MWh | Compliance tightening |
| 2026 | ~$78.00/MWh | Current year estimate (verify via 225 CMR 14) |
Pre-high-inflation baseline
Post-CPI step-up
CPI adjustment continues
Compliance tightening
Current year estimate (verify via 225 CMR 14)
Source: MA DOER RPS compliance filings and 225 CMR 14. The 2026 rate shown is an estimate based on CPI adjustment methodology. Always verify the current ACP with DOER before modeling REC revenue in a pro forma.
GATS (Generation Attribute Tracking System) is the PJM Environmental Information Services registry used by Massachusetts, the rest of New England, and the Mid-Atlantic. Every REC has a complete lifecycle inside GATS, and any renewable claim outside the registry is not legally defensible.
Project owner registers the system in GATS with interconnection documentation, commercial operation date, and nameplate capacity. ISO-NE generator ID is required.
Each MWh of metered generation is minted as one GATS certificate with vintage, fuel type, and state eligibility tags. Meter data flows from the revenue-grade meter quarterly.
RECs are sold or transferred to a buyer via GATS account-to-account transactions. Brokers often aggregate small project RECs into compliance-sized parcels.
The final holder retires the REC against a specific claim: RPS compliance, voluntary green power, or a corporate sustainability report. Once retired, the REC cannot be reused.
Telling a customer or regulator that your facility is powered by solar without a retired GATS certificate is not a defensible claim. The REC is the legal instrument that conveys the zero-carbon attribute. Solar electrons and solar attributes are legally separable. If you sold the REC, you sold the right to the solar claim. Retain and retire, or accept that the electricity you are consuming is legally grid-average once the REC leaves your account.
The single most important commercial REC question is whether to retire the attribute against your own sustainability claim or sell it into the compliance market. The answer depends on governance, not engineering. Here are the most common profiles we see at NuWatt.
Scope 2 renewable matching requires a retired, vintage-matched REC. Selling the RECs forfeits the underlying solar claim and can trigger greenwashing exposure.
FTC Green Guides treat unsupported renewable claims as deceptive. If your site or report says you run on solar, the attribute must be retained and retired in GATS.
BERDO 2.0 accepts certain vintage-matched RECs for compliance. Retaining solar Class I RECs from your own system can offset compliance gaps cheaper than buying Alternative Compliance Payments.
Without a public claim, selling RECs into the Class I compliance market is pure revenue upside. At $40-$60/MWh, RECs can add $4,000-$6,000 per 100 MWh produced annually.
The PPA typically assigns RECs to either the host (for claims) or the developer (for sale). Review the REC ownership clause and whether RECs come with the PPA energy.
Most municipal green-power pledges require retained attributes. Selling RECs to improve project economics conflicts with the public green claim, even if legally allowed.
Selling Class I RECs into compliance markets at $40-$60 per MWh can add meaningful revenue, but it forfeits the ability to publicly say your solar system powers your building. That trade-off should be made at the board and legal level, not in a sales meeting with your installer. Before your project reaches financial close, align your REC strategy with:
At NuWatt we typically run a three-way IRR model comparing SMART, non-SMART with REC sales, and non-SMART with REC retention plus imputed avoided Scope 2 cost. We then present the result to the client sustainability lead and controller together so the decision reflects both economics and disclosure posture.
Not every REC is worth the same. SREC II legacy certificates, Class I compliance RECs, and voluntary Green-e certified RECs price at very different levels. The table below reflects approximate 2026 ranges. Actual trades depend on vintage, delivery year, and buyer type.
| Market | Typical Price | Buyers | Liquidity |
|---|---|---|---|
SREC II Legacy Only systems enrolled 2013-2018. Prices approximate and reflect remaining eligibility years. | $190-$260 / SREC | Compliance obligated entities | Low (thin market, expires 2028) |
Class I Compliance New commercial solar, non-SMART. ACP ceiling ~$78/MWh in 2026. | $30-$60 / MWh | Load-serving entities, competitive suppliers | Moderate (active MA compliance market) |
Voluntary Green-e Certified voluntary market. Lower prices because it competes with wind RECs from the Midwest. | $3-$15 / MWh | Corporate buyers, green power marketers | High (national market) |
Buyers: Compliance obligated entities
Liquidity: Low (thin market, expires 2028)
Only systems enrolled 2013-2018. Prices approximate and reflect remaining eligibility years.
Buyers: Load-serving entities, competitive suppliers
Liquidity: Moderate (active MA compliance market)
New commercial solar, non-SMART. ACP ceiling ~$78/MWh in 2026.
Buyers: Corporate buyers, green power marketers
Liquidity: High (national market)
Certified voluntary market. Lower prices because it competes with wind RECs from the Midwest.
Revenue reality check: A 500 kW commercial rooftop producing ~600,000 kWh per year (~600 MWh) mints 600 Class I RECs annually. At $45/MWh that is $27,000 per year in REC revenue outside of SMART. Over a 20-year life (with price assumptions) the total REC stream can reach $400,000-$600,000 on an undiscounted basis. Those are real numbers that belong in your pro forma.
The Federal Trade Commission's Green Guides (16 CFR Part 260) govern how companies can make renewable energy and carbon claims to consumers, investors, and other stakeholders. Non-compliance exposes you to FTC enforcement actions, state attorney-general claims, and private greenwashing litigation. Here is the short version commercial solar owners actually need to know.
Enforcement trend: Since 2023, FTC staff and state AGs have expanded scrutiny of corporate renewable claims, and investor plaintiffs have filed multiple securities suits based on green marketing. The safest posture: retain the RECs you need for the claim you want to make, sell only the excess, and disclose clearly in your sustainability report.
Not legal advice. This section summarizes public regulatory guidance. Consult your sustainability counsel and the actual text of 16 CFR Part 260 before publishing any renewable energy claim.
Commercial solar owners choose one of two paths at project design time. Once a project is enrolled in SMART, the REC attribute is gone for the duration of the tariff. Once a project opts out of SMART, the owner carries REC market exposure for 20 years.
Under SMART, the utility takes the Class I REC on your behalf and sells it into the compliance pool. You do not see the REC revenue separately. It is priced into the fixed SMART rate.
Outside of SMART the owner keeps the REC stream and decides year by year whether to sell or retire. Some owners sign multi-year fixed-price REC offtake agreements to reduce price volatility.
Tax treatment consideration: Both pathways preserve eligibility for the commercial Investment Tax Credit under Section 48E, active through the July 4, 2026 construction deadline. The ITC applies to the system, not to the REC stream. See our companion analysis on ITC vs PTC for MA commercial solar for project sizing considerations.
Profile: Public sustainability commitment, SBTi-aligned 1.5°C target, CDP A-list.
Decision: Retain and retire all Class I RECs from the rooftop solar system.
Rationale: Scope 2 market-based accounting requires retained vintage-matched RECs. The company accepts lower project IRR in exchange for a defensible 100% renewable claim that holds up under investor scrutiny.
Profile: Asset-level financial returns, no building-specific renewable claim, fund-level ESG reporting only.
Decision: Enroll in SMART, let the utility monetize the REC, maximize bankable cash flow.
Rationale: The REIT's capital markets team values predictable 20-year cash flow more than tenant-facing green marketing. SMART gives the most bankable pro forma.
Profile: City has a 100% renewable municipal operations goal; local taxpayer scrutiny; no aggressive financial return target.
Decision: Non-SMART, retain RECs, retire against the city's renewable portfolio.
Rationale: The municipality forgoes SMART revenue so it can honestly tell voters the building runs on retained city-generated solar. The SMART adder for public entities would have been attractive, but the REC retention outweighs the tariff upside.
If you are evaluating a new MA commercial solar project or inheriting an SREC II legacy system, here is the diligence checklist we walk clients through before financial close.
Only if you were enrolled in SREC I (2010-2013) or SREC II (2013-2018) before those programs closed to new projects. Both SREC programs are closed to new capacity. SREC II systems continue generating tradable SREC II certificates for a 10-year qualification term, so the last SREC II systems reach end of eligibility in 2028. New MA commercial solar projects cannot earn SRECs and instead go through the SMART program, where the utility keeps the associated Class I RECs in exchange for the fixed SMART tariff payment.
A Class I REC is the Massachusetts Renewable Portfolio Standard compliance product: one REC equals one megawatt-hour of Class I eligible renewable generation (new solar, wind, small hydro, etc.). An SREC is a subset solar-specific compliance product that existed under MA SREC I and SREC II carve-outs before SMART replaced the carve-out structure. SREC II certificates still trade in a small legacy market. Class I RECs from new solar (non-SMART) trade into the general RPS Class I compliance pool competing against wind, small hydro, and other Class I resources.
It depends on your corporate sustainability strategy. If you have a public Scope 2 emissions pledge, science-based target (SBTi), RE100 commitment, or CDP disclosure that requires renewable claims, you must retire the RECs to legally claim the underlying solar generation as zero-carbon electricity. If you have no public renewable claim, selling the RECs into the MA compliance market generates meaningful revenue (often $30-$60 per MWh in 2026) that can improve project IRR. Selling the RECs means the electricity you consume is legally grid-average carbon intensity, not solar. Governance policy and sustainability commitments should determine the answer, not installer sales pitches.
The ACP is the per-MWh fee retail electricity suppliers pay the state instead of surrendering Class I RECs. It sets a functional ceiling on Class I REC market prices because no supplier pays more for a REC than the ACP. For 2026, the MA DOER ACP rate for Class I is approximately $78/MWh, adjusted annually by the Consumer Price Index (CPI) under 225 CMR 14. Actual REC trading prices in 2026 sit well below the ACP in a typical year, usually in the $30-$60/MWh band, but tight compliance years can push prices closer to the ACP ceiling.
GATS (Generation Attribute Tracking System) is the PJM Environmental Information Services registry that mints, tracks, and retires RECs for the Northeast, including Massachusetts. Every MWh your solar system generates is minted as a GATS certificate with the solar attribute. From there, you can sell the REC to a buyer, retire it against your own renewable claim, or have your SMART utility take it. Nothing is legally a REC until it is minted in GATS, and nothing counts as a retirement until it is formally retired in the GATS registry. Claiming solar electricity without a GATS retirement is not defensible under FTC Green Guides.
Yes. The FTC Green Guides (16 CFR Part 260) govern how companies can advertise renewable energy and carbon claims to consumers, investors, and other stakeholders. Relevant provisions: you can only claim solar electricity if you own or retire the associated RECs; you must disclose if claims are based on purchased RECs vs. on-site generation; and unsubstantiated environmental claims can trigger enforcement and private litigation. If your company publicly says its facility runs on solar but sold the RECs to a third party, that claim is deceptive under the Green Guides. Work with counsel and align REC strategy to marketing language before publishing claims.
Under SMART, the associated RECs (Class I) are transferred to the distribution utility as part of the tariff structure. The utility feeds those RECs into the MA RPS Class I compliance portfolio on behalf of all ratepayers. This is why SMART is considered an all-in compensation model: you receive the fixed $/kWh SMART payment, but you cannot separately monetize or retire the RECs. If your company wants to publicly claim the solar as its own renewable supply under SBTi or RE100 rules, SMART is generally not the right pathway because you no longer own the attribute.
A self-owned REC strategy (Class I without SMART) makes sense when the owner has a strong sustainability mandate and wants to retire RECs for Scope 2 matching, or when the owner expects Class I REC prices to rise faster than SMART payments. SMART is usually the better revenue choice for owners without a sustainability mandate because the fixed 20-year payment is more bankable than merchant REC sales. For mid-market commercial owners we usually model both pathways: SMART base rate with adders vs. non-SMART with retained Class I RECs plus ITC treatment, and choose based on the governance goal, not just the dollar delta.
Primary source documents we reference when advising clients on MA REC strategy. Always verify current rates and rules with the DOER before closing a deal.
The governing regulation for Class I RECs, ACP rates, and annual compliance obligations.
Historical SREC I and SREC II program rules, factors, and qualification windows.
Registry for minting, transferring, and retiring MA-eligible RECs, plus monthly price and volume reports.
Federal guidance on environmental marketing claims including renewable energy and carbon claims.
Disclaimer: REC market prices and ACP rates are current as of April 2026 and change frequently. This page reflects our best understanding of public data and should not be treated as a quoted price or legal advice. NuWatt provides commercial solar development services, not brokerage or legal counsel.
Keep exploring the policy stack that sits around SRECs and Class I RECs.
Flat incentive rates, adders, and the 20-year tariff that replaced SREC II for new projects.
Read guideNine adder categories, eligibility rules, and how they layer on top of the base SMART rate.
Read guideInteractive tool for commercial SMART base rate + adders by utility territory.
Read guideTop-level guide to commercial solar economics, tax treatment, and development in Massachusetts.
Read guideHow to design a commercial solar + REC strategy that actually supports a 100% renewable claim.
Read guideFull stack of MA solar incentives, including SMART, net metering, and ConnectedSolutions.
Read guideHonest assessment of SMART 3.0 economics for residential and small commercial solar.
Read guideSection 48E vs Section 45Y for MA commercial solar under the July 4, 2026 deadline.
Read guideNuWatt builds the three-way IRR model, aligns it with your sustainability disclosures, and executes the development plan: SMART enrollment, non-SMART Class I REC retention, or a blended approach across your MA commercial solar portfolio.
Every commercial project gets a dedicated policy review before design starts. No templated recommendations.