NH HB1723

Requires electric utilities and developers to conduct technical assessments of all high-voltage transformers (100 kV or greater, 25 MVA or greater capacity) for vulnerability to geomagnetically induced currents from solar events and electromagnetic pulses by January 1, 2027

Mandates detailed vulnerability reports submitted within 180 days to the Department of Energy, Public Utilities Commission, governor, homeland security chief, and legislature, including transformer specifications, age, replacement costs, and lead times

Reports must include recommended GIC protection solutions, total implementation costs, priority rankings by damage risk, and funding recommendations including potential grants and rate recovery mechanisms

Prohibits utilities from relying solely on operational procedures like load shedding to mitigate GIC risk; such measures are explicitly deemed insufficient protection under the act

Sensitive location and infrastructure purpose data must be redacted from public reports under Critical Energy Infrastructure Information (CEII) protocols; effective date is July 1, 2026