Grid Transformer Vulnerability Assessment Requirements
Summary
New Hampshire passed HB1723, requiring utilities and electric grid operators to assess and report vulnerability of high-voltage transformers to geomagnetic and electromagnetic disturbances. The bill also mandates recommendations for mitigation measures to protect state electric infrastructure. The legislation passed the House on March 17, 2026, during the 2026 Regular Session.
What changed
HB1723 establishes new assessment and reporting requirements for high-voltage transformer vulnerability. Utilities and electric grid operators operating in New Hampshire must evaluate their transformers' susceptibility to geomagnetic disturbances (GMD) and electromagnetic disturbances (EMD), and submit reports with recommended mitigation measures to protect state electric infrastructure.
Affected utilities should review current transformer inventory, initiate vulnerability assessments, and prepare compliance documentation. The bill passed with bipartisan sponsorship from Representatives Mattson, Cole, Qualey, and others, with committee approval in both the House Science, Technology and Energy Committee and the Senate Energy and Natural Resources Committee.
What to do next
- Review high-voltage transformer inventory and assessment requirements under HB1723
- Initiate vulnerability assessments for transformers exposed to geomagnetic and electromagnetic disturbances
- Prepare and submit required reports with mitigation recommendations to state authorities
Source document (simplified)
ChangeBridge / New Hampshire / HB1723 Passed HB1723 House Bill Passed 2026-03-17
Requiring utilities and electric grid operators to assess and report the vulnerability of high-voltage transformers to geomagnetic and electromagnetic disturbances, and to recommend mitigation measures to protect the state electric infrastructure.
Bill Details
State New Hampshire
Session 2026 Regular Session
Chamber House
Official Source gc.nh.gov/billstatus/legacy/bs2016/bills...
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Sponsors
Rita Mattson (Rep - R) Brian Cole (Rep - R) Jim Qualey (Rep - R) Matt Sabourin (Rep - R) John Schneller (Rep - R) Douglas Thomas (Rep - R) Michael Vose (Rep - R) Keith Ammon (Rep - R) Kat McGhee (Rep - D) Mary Murphy (Rep - R) Daniel Innis (Sen - R) Denise Ricciardi (Sen - R)
Action History
2026-04-02 S Committee Report: Ought to Pass with Amendment # 2026-1307s, 04/09/2026; Vote 4-0; Consent Calendar; Senate Calendar 13 2026-03-26 S Hearing: 03/31/2026, Room 103, State House, 09:00 am; Senate Calendar 12 2026-03-17 S Introduced 03/12/2026 and Referred to Energy and Natural Resources; Senate Journal 7 2026-03-12 H Ought to Pass with Amendment 2026-0935h: Motion Adopted Voice Vote 03/12/2026 House Journal 8 2026-03-12 H Amendment # 2026-0935h: Amendment Adopted Voice Vote 03/12/2026 House Journal 8 2026-03-04 H Minority Committee Report: Inexpedient to Legislate 2026-03-04 H Majority Committee Report: Ought to Pass with Amendment # 2026-0935h 03/03/2026 (Vote 13-3; Regular Calendar) House Calendar 10 P. 72 2026-02-18 H ==CONTINUED== Executive Session: 03/03/2026 10:00 am GP 159 2026-02-12 H ==RECESSED== Executive Session: 02/17/2026 10:00 am GP 229 2026-01-29 H Subcommittee Work Session: 02/02/2026 10:30 am GP 229 2026-01-08 H Public Hearing: 01/14/2026 01:00 pm GP 229 2025-12-17 H Introduced 01/07/2026 and referred to Science, Technology and Energy House Journal 1 P. 33
Committee Referrals
2025-12-17 H Science, Technology and Energy 2026-03-17 S Energy and Natural Resources
Bill Text Versions
0000-00-00 Introduced Legislative data powered by LegiScan (CC BY 4.0)
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