What the new MA permitting rules change
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Table of Contents
Massachusetts changed the rules for siting solar, onshore wind, and battery storage when Governor Healey signed Chapter 239 of the Acts of 2024. The state finalized the regulations on February 27, 2026. Most provisions take effect July 1, 2026. Below is the short version. A more detailed primer will follow.
What used to happen
The Energy Facilities Siting Board reviewed generation projects above 100 megawatts. No solar or wind project in Massachusetts has ever reached that threshold. Every such project ran through local permitting, often through several boards in sequence. Our research team’s 2026 study of 26 projects across 17 Massachusetts towns found a median local review of 173 days. Contested and larger projects ran much longer.
What changes
The new law does four things.
It lowers the state threshold. Solar and wind above 25 megawatts now go to the Siting Board. Battery storage above 100 megawatt-hours joins them. Most current projects still fall below the new threshold and stay with towns.
It consolidates permits. A small project gets one local permit. A large project gets one state permit that covers state, regional, and local approvals.
It sets deadlines. Towns have twelve months to decide a small project. The Siting Board has fifteen months to decide a large one. A missed local deadline grants the permit by operation of law.
It adds engagement and equity requirements. Developers must hold community meetings before filing. Large projects must complete a Site Suitability Assessment that scores farmland value, wildlife, carbon storage, climate resilience, and existing social burdens. A new state fund pays for legal counsel and expert analysis for towns, community groups, and residents.
Key dates
| Date | What happens |
|---|---|
| November 21, 2024 | Governor Healey signs Chapter 239 |
| February 27, 2026 | State publishes the final regulations |
| July 1, 2026 | Siting Board begins accepting applications. Towns may begin offering the new local process |
| October 1, 2026 | All towns must offer the new local process |
What is still unsettled
No project has completed a full cycle under the new rules. Several questions remain open. Will towns meet the twelve-month deadline, or will constructive approvals become common? Will the lower 25-megawatt threshold push developers to size projects just below it? Will the intervenor fund reach the residents and groups it was designed to serve?
We will follow the answers as they emerge.