GeoLawWatch by State

Geoengineering Bills by State

2026 Regular Session

Adjourned Session ended Jun 30, 2026

Governor: Kelly Ayotte

Bill #	Details	Effective	Status
2013 Regular Session
HB179	Repealing the law on weather modification experimentation.		Inexpedient to Legislate
	This two-sentence repeal bill from 2013 represents the earliest known attempt in the New Hampshire legislature to eliminate the state's weather modification statute. Despite generating enough interest for a recessed public hearing, it was killed 12-7 in committee - a closer vote than the unanimous rejection that later repeal attempts would receive.			Last update Wed 13 Feb 2013
	Note: House voted Inexpedient to Legislate; the bill died.

2020 Regular Session
SB520	Repealing the statute governing weather modification experimentation.		Inexpedient to Legislate
	This two-sentence bill - the earliest in New Hampshire's weather modification legislative saga - proposed simply repealing the state's weather modification statute without explanation or replacement. Despite bipartisan Senate sponsorship, including five Senators, it was unanimously killed in committee, setting the stage for a pivot to the transparency-based approach that would succeed the following year with HB 128.			Last update Thu 30 Jan 2020
	Note: Senate voted Inexpedient to Legislate; the bill died.

2021 Regular Session
HB128	Adding notification requirements to the weather modification statute.		Passed
	This bipartisan transparency bill sailed through the legislature with near-unanimous support (18-0 in the House committee, 5-0 in the Senate committee). It was signed into law by Governor Sununu, establishing public notification requirements for state weather modification programs. Notably, the statute this bill amended (RSA 12-F) is the same statute that HB 764 (2025) proposes to repeal entirely and replace with a prohibition on geoengineering.			Last update Wed 19 May 2021
	Note: Bill passed, became Chapter 34, effective July 16, 2021.

2024 Regular Session
HB1700	Prohibiting the intentional release of polluting emissions, including cloud seeding, weather modification, excessive electromagnetic radio frequency, and microwave radiation and making penalties for violation of such prohibition.		Inexpedient to Legislate
	This predecessor to HB 764 combined geoengineering prohibition with electromagnetic radiation limits and a mandatory citizen reporting system deputizing the public as atmospheric monitors. The bill was decisively rejected 315-58 on the House floor after a 16-3 negative committee vote, representing one of the most lopsided defeats for geoengineering legislation in any state.			Last update Thu 8 Feb 2024
	Note: House voted Inexpedient to Legislate; the bill died.

2025 Regular Session Session Adjourn Mon 12 Jan 2026
HB764	Prohibiting the intentional release of polluting emissions, including cloud seeding, weather modification, excessive electromagnetic radio frequency, and microwave radiation and making penalties for violation of such prohibition.		Laid on table
	This geoengineering prohibition bill received an overwhelming 17-1 negative committee recommendation but was rescued by the full House through a procedural table motion, leaving it in legislative limbo. The bill's Tenth Amendment rationale and requirement that New Hampshire formally notify 25 federal agencies - including nuclear regulators - of its new atmospheric restrictions reflects an assertive states' rights posture rarely seen in environmental legislation.			Last update Thu 13 Mar 2025
	Note: Session adjourned 30th June 2025, currently laid on the table in House.

2026 Regular Session Session Adjourn Tue 30 Jun 2026
HB1618	Prohibiting solar radiation modification, weather modification, and other polluting atmospheric interventions.	1 Jan 2027	Inexpedient to Legislate
	New Hampshire's HB1618 creates an aggressive enforcement regime against atmospheric interventions involving pollutants, establishing a citizen deputy system where county sheriffs must deputise volunteers to help enforce felony prohibitions carrying minimum $500,000 fines, while simultaneously empowering the Air National Guard to interdict aircraft and imposing strict electromagnetic radiation limits on communications facilities—making artificial intelligence entities themselves subject to criminal prosecution.			Last update Thu 5 Feb 2026
HB1128	Restricting the use of weather modification technologies to declared emergencies.	60 days	Laid on table
	New Hampshire would restrict cloud seeding to verified extreme drought conditions lasting at least 90 days, replacing the state's existing open-ended weather modification authorisation with a drought-contingent regulatory framework that requires environmental review and public disclosure.			Last update Thu 14 May 2026
	Status: Passed by the House, recommended by the Senate committee, but laid on table by Senate (since 14 May 2026)
	Note: Passed by the House, recommended by the Senate committee, but laid on table by full Senate
HR35	Urging the prohibition of the intentional release of polluting emissions, including cloud seeding and weather modification, to preserve the atmosphere of New Hampshire.		Adopted
	New Hampshire's House urges the prohibition of atmospheric geoengineering through a formal resolution requiring the state environmental agency to notify 27 federal entities of the policy. However, the measure creates no enforceable penalties or regulatory framework—representing legislative intent rather than binding law.			Last update Thu 5 Mar 2026
	Note: Motion Adopted Regular Calendar 169-152 03/05/2026 House Journal 6

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