Maine Data Center Moratorium (LD 307) — VETOED

Maine's legislature became the first in the nation to pass a statewide data center moratorium — a pause on data centers over 20 megawatts until November 2027 — but Gov. Janet Mills vetoed it on April 24, 2026. She said she supports a temporary moratorium but wanted an exemption for development already underway at the former Androscoggin Mill site in the town of Jay. So there is no statewide Maine data center moratorium; local moratoriums (e.g., Bangor) still apply.

Technical detail

LD 307 (132nd Legislature) would have imposed a moratorium on data centers rated over 20 MW until November 2027. Passed both chambers ~April 14, 2026; vetoed by Gov. Mills April 24, 2026 (citing the lack of an exemption for the former Androscoggin Mill site in Jay). Veto not overridden — not law.

Who is protected: (Would have protected) Maine ratepayers and communities near large data centers — not in effect

Who must comply: (Would have applied to) developers of data centers over 20 MW — not in effect

Key facts

More AI rules in Maine

• Maine mental-health AI limits (2026) · In effect
• Maine LD 61 (employer surveillance disclosure & prohibition) · In effect
• ME AI Private Images Law · In effect
• Maine AI Chatbot Disclosure Law · In effect
• Maine AI-in-Therapy Law (licensed pros only) · In effect
• An Order Establishing the Maine Artificial Intelligence Task · In effect

Related data-center siting and energy rules elsewhere

• Superior WI Data Center Moratorium (1-year) · In effect
• Dane County WI Hyperscale Data Center Moratorium · In effect
• Madison WI Data Center Moratorium (1-year) · In effect
• Manitowoc County WI Data Center Moratorium · In effect
• WA SB 5982 (Data Center / Clean Energy) · In effect
• Dayton OH data center moratorium (180-day, Apr 2026) · In effect