The "Survey All Vulnerable Electric Transformers Act" mandates the Department of Energy to investigate the vulnerabilities of electric transmission transformers to geomagnetic and electromagnetic disturbances, such as coronal mass ejections and high-altitude nuclear electromagnetic pulses. The investigation will assess previous studies on transmission system vulnerabilities, evaluate the adequacy of existing magnetic field standards, and identify potential mitigation strategies. The Department is required to commence this investigation within 120 days of the act's effective date and complete it within 12 months, ultimately reporting its findings and recommendations to various state and federal entities.

Additionally, the bill grants the Department of Energy the authority to request information from public utilities regarding transmission infrastructure in New Hampshire, contingent upon sufficient funding through the biennium ending June 30, 2029. It also stipulates that all data collected will be handled according to critical energy infrastructure information protocols, ensuring sensitive information is kept confidential to protect against potential security threats. The act is set to take effect on September 1, 2027.