On Thursday, June 11, 2026, a group of Connecticut state agencies—the  Department of Energy and Environmental Protection, the Public Utilities Regulatory Authority, the Office of Consumer Counsel, and Attorney General William Tong—filed a complaint with the Federal Energy Regulatory Commission (FERC) challenging the continued receipt by two Connecticut utilities, The Connecticut Light & Power Company d/b/a Eversource Energy, and The United Illuminating Company, of a 50-basis point increase or “Adder” to the return on equity component of their transmission rates.

The complaint highlights a 2025 Connecticut law requiring the state’s utilities to participate in ISO New England, Inc., the regional transmission organization (RTO) for New England. FERC and the Sixth and Ninth Circuit courts of appeal have held that the Adder is to be an incentive for utilities that join an RTO voluntarily and should not be awarded where state law requires RTO participation. Based on these precedents and Connecticut’s new law, the State Agencies ask FERC to terminate the continued collection by Eversource and UI of the previously-authorized participation Adder, and to order refunds of adder-related charges imposed after the filing of the complaint. If granted, the State Agencies estimate that Connecticut ratepayers will experience a reduction in transmission charges of roughly $4.5 million per year.

Spiegel attorneys Scott Strauss, Jeff Schwarz, and Lauren Springett represent the Connecticut Department of Energy and Environmental Protection.

A copy of the complaint is linked here.