Massachusetts' BESS moratorium wave meets a state permitting reset: what the new SitePath data shows

Important framing caveat: this is a dataset event. The underlying town actions span 2022–2026; SitePath ingested and structured them on 2026-07-20. Treat the newsworthiness as "SitePath now has verifiable, source-linked coverage of the MA BESS regulatory landscape," not "these events happened this week."

What changed

SitePath merged several county-cluster research dossiers into the canonical store, covering a dozen or more Massachusetts counties and the BESS-related ordinance records behind them. Two things stand out for siting professionals:

1. A statewide permitting reset. Under Chapter 239 of the Acts of 2024, Massachusetts created a consolidated siting/permitting process for clean-energy facilities. The Department of Energy Resources (DOER) has issued a draft three-tier model BESS bylaw (municipal webinar held 2025-10-21) to operationalize it. The model defines a Tier 3 band of 10–<100 MWh, requires UL 9540 listing and NFPA 855 compliance, and — per the dossier's reading of the draft — recommends modest setbacks (≈20 ft front/side, 25 ft rear; 50 ft abutting residential) and a decommissioning surety around 125% of cost. Facilities ≥100 MWh route to state-level "Large Clean Energy" review. Source: DOER draft model BESS bylaw — https://www.mass.gov/doc/doer-draft-battery-energy-storage-systems-bess-model-bylaw/download

2. A local-vs-state preemption fight the AG keeps winning. Repeatedly, MA towns have tried to ban or pause standalone BESS, and the AG's Municipal Law Unit has struck those provisions down as preempted under G.L. c. 40A §3 and Tracer Lane II Realty v. City of Waltham. From the ingested records:

• Blandford (Hampden): Town Meeting (fall 2025) passed a temporary moratorium on large-scale solar and BESS; AG disapproved it 2026-03-11. Source: https://foleyhoag.com/news-and-insights/blogs/energy-and-climate-counsel/2026/march/massachusetts-ago-rejects-yet-another-municipal-solar-and-battery-storage-moratorium/
• Northfield (Franklin): BESS + large-solar moratoria; AG disapproved 2024-10-30. Source: https://www.northfieldma.gov/DocumentCenter/View/371/562024-Town-Meeting-Solar-Articles-Decision-PDF
• Shutesbury (Franklin): tiered bylaw (>10 MW prohibited); AG disapproved in full 2024-11-25. Source: https://gazettenet.com/2024/04/29/shutesbury-voters-back-battery-storage-bylaw-at-town-meeting-54931054/
• Wendell (Franklin): licensing bylaw effectively barring >10 MW; AG partially disapproved 2023-03-01. Source: https://www.mass.gov/doc/mlu-decision-town-of-wendell-11380/download
• Spencer (Worcester): town-wide ESS principal-use prohibition; AG disapproved (5/30/2023). Source: https://massago.hylandcloud.com/231publicaccess/
• Carver (Plymouth): 2022 solar/BESS moratorium disapproved by then-AG Healey; replaced by a tiered permitting bylaw. Source: https://massago.hylandcloud.com/231publicaccess/api/Document/AWv44z6JnFLAbcvxvUhaRx4Eo3m8OEFiuPRxWarn1cfmmpAbGQFsUiGuOQwKwznGDPY5ns15zu92Y%C3%81G8p7p86pQ=

Meanwhile some towns are writing restrictive-but-durable rules rather than bans — the approach that survives review:

• Oakham (Worcester): allows BESS only when appurtenant to a permitted large-scale solar array (bans standalone) — https://www.oakham-ma.gov/DocumentCenter/View/355/Bylaws-PDF
• Whately (Franklin): Nov 12 2025 STM lowered the Aquifer Protection aggregate-storage threshold 300→250 kWh — https://recorder.com/2025/11/13/whately-special-town-meeting/
• Amherst (Hampshire): draft Clean Energy Bylaw with a proposed 600-ft BESS setback, still in hearings (May 20 / June 3 2026) — https://www.amherstindy.org/2026/05/22/planning-board-and-community-resources-committee-review-draft-of-clean-energy-bylaw/
• Duxbury (Plymouth): draft bylaw (warrant dated 2025-12-30) — special permit, 50 dB noise cap — https://www.town.duxbury.ma.us/sites/g/files/vyhlif10506/f/uploads/battery_energy_storage_zoning_bylaw_amendment_-_draft_for_initial_version_of_warrant_-_12-30-25.pdf

Why it matters for siting

For a developer, the MA signal is unusually clean: outright bans and blanket moratoria are not a durable siting risk in Massachusetts — the AG has invalidated them town after town under the state's solar-protection statute, and Tracer Lane II extends that logic to storage. The real friction has migrated into zoning levers that survive review: aquifer-overlay capacity thresholds (Whately), large setbacks (Amherst's proposed 600 ft), aquifer/earth-removal restrictions, and solar-pairing requirements (Oakham). Diligence should price in those specific levers, not the headline "moratorium."

The Ch. 239 / DOER model-bylaw track is the counterweight: a state framework that gives towns a permit-able path (tiered by MWh, with UL 9540 / NFPA 855 baked in) and pushes ≥100 MWh projects toward consolidated state review. For SitePath users this is the template many MA towns will converge on — worth tracking adoption town-by-town.

This also validates the platform's ISO-NE expansion: MA BESS ordinances are now first-class, source-linked records alongside PJM/Mid-Atlantic.