Solar Energy Policy History in Massachusetts: Key Legislation and Program Milestones

Massachusetts has enacted a layered sequence of solar energy legislation spanning more than two decades, establishing one of the most structured state-level renewable energy frameworks in the northeastern United States. This page traces the major statutes, regulatory programs, and administrative milestones that govern solar development in the Commonwealth, from the 1997 Renewable Portfolio Standard through the successor incentive programs still shaping the market. Understanding this legislative history is essential for interpreting how solar energy systems operate under Massachusetts jurisdiction and why specific permitting, financial, and grid-interconnection rules exist in their current form.

Definition and Scope

Massachusetts solar energy policy encompasses the body of state statutes, executive orders, regulatory proceedings, and program structures that determine how solar generation is permitted, compensated, incentivized, and integrated into the electric grid. The primary administering bodies are the Massachusetts Department of Energy Resources (DOER), the Massachusetts Department of Public Utilities (DPU), and the Massachusetts Clean Energy Center (MassCEC). Federal law — including the Public Utility Regulatory Policies Act of 1978 (PURPA) and the Internal Revenue Code provisions governing the Investment Tax Credit — overlaps with but does not displace this state framework.

Scope and coverage limitations: This page addresses Massachusetts state law and regulatory programs only. Federal solar policy, New England regional grid rules administered by ISO New England, and municipal zoning ordinances operate as adjacent but distinct layers. Situations involving federally owned land, tribal jurisdiction, or installations in neighboring states are not covered here. For the full regulatory context for Massachusetts solar energy systems, including the specific code sections governing each program, that dedicated reference should be consulted.

How It Works

Massachusetts solar policy has advanced through discrete legislative acts and regulatory dockets, each building on prior infrastructure. The structure can be broken into five chronological phases:

  1. Renewable Portfolio Standard (RPS) — 1997 to 2008: The Massachusetts Electric Deregulation Act of 1997 (St. 1997, c. 164) created the RPS, requiring retail electricity suppliers to source a minimum percentage of sales from qualifying renewable generation. Solar qualified under Class I renewables, establishing the foundational market for Massachusetts Solar Renewable Energy Certificates (SRECs).

  2. Green Communities Act — 2008: Chapter 169 of the Acts of 2008 substantially expanded the RPS annual increment requirement and authorized net metering, directing the DPU to establish net metering rules for residential, commercial, and municipal systems. It set the initial net metering capacity cap at 1% of a utility's historical peak load. Details of the net metering structure are addressed at net metering in Massachusetts.

  3. SREC I and SREC II Programs — 2010 to 2018: DOER administered two successive SREC programs under which solar generators earned one SREC per megawatt-hour of production, sold into a compliance market. SREC I closed to new applications in 2013. SREC II operated through April 2018, with a declining SREC factor applied to systems as the market matured, providing a predictable revenue stream that drove residential installations above 100,000 systems statewide (DOER SREC Program Archive).

  4. An Act to Promote Energy Diversity — 2016: Chapter 188 of the Acts of 2016 directed DOER to design a successor solar incentive after the SREC II capacity ceiling. It also raised the net metering cap to 7% of historical peak load for private systems and 8% for government and nonprofit entities, and authorized long-term contracts for offshore wind — a policy dimension that intersects with solar through grid capacity planning, as discussed at offshore wind and solar interaction in Massachusetts.

  5. Solar Massachusetts Renewable Target (SMART) Program — 2018 to present: Launched under 225 CMR 20.00, the SMART Program replaced the SREC market with a fixed declining-block tariff structure. Capacity is divided into blocks for each utility territory — Eversource, National Grid, and Unitil — with base compensation rates that decrease as each block fills. Adders apply for battery storage, low-income projects, and agricultural installations. The program's structure is examined in depth at Massachusetts SMART Program explained.

Common Scenarios

Residential rooftop installation: A homeowner installing a system under 25 kilowatts applies for net metering through the serving utility and, if SMART Program blocks remain open, enrolls for a 10-year tariff adder under 225 CMR 20.00. The MassCEC administers income-eligible pathways under the Commonwealth Solar program for households below 80% of area median income (MassCEC Low-Income Solar).

Commercial ground-mount on agricultural land: An agricultural solar project qualifies for an adder under SMART and may also qualify for the federal Investment Tax Credit under IRC § 48. Agricultural solar in Massachusetts addresses the dual-use and land-use permitting dimensions that arise when farmland is converted partially or fully to solar use.

Municipal or school district project: Public entities benefit from the 8% net metering cap allocation and may use alternative procurement structures including solar power purchase agreements authorized under the Green Communities Act. Municipal solar projects in Massachusetts covers the procurement frameworks applicable to cities, towns, and regional school districts.

Decision Boundaries

SREC II vs. SMART: Systems that received a Statement of Qualification under SREC II before April 2018 remain in that program for their original qualification term. Systems commissioned after the SREC II closure date enter SMART or receive no state production incentive unless an alternative program is legislatively created. The two programs cannot be combined for the same system.

Net metering cap status: When a utility's net metering cap is reached, new applicants are placed on a waitlist. The cap status differs by utility territory and by customer class (private versus government/nonprofit), requiring verification with the specific utility prior to project financing. The utility interconnection process in Massachusetts describes how cap status interacts with interconnection queue timing.

Class I RPS eligibility: Not all solar systems qualify as Class I RPS resources. Systems that receive SMART Program tariff compensation are treated as fully compliant under RPS rules administered by DOER, but community shared solar arrangements carry distinct eligibility conditions under 225 CMR 14.00 and 225 CMR 20.00 that differ from those governing community shared solar in Massachusetts.

For a broader orientation to the solar energy landscape in the Commonwealth, the Massachusetts Solar Authority home provides a structured entry point to all major topic areas, including Massachusetts solar incentives and rebates and the solar property tax exemption that operates independently of any incentive program enrollment.

References

📜 45 regulatory citations referenced  ·  ✅ Citations verified Feb 25, 2026  ·  View update log

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