ES · 10-Q · 2026Q3 · Full report

Connecticut RTO Adder Complaint

EVERSOURCE ENERGY · 2026-11-06 · Importance 35 · Surprise 42 · In source text

On June 11, 2026, Connecticut state agencies filed a FERC complaint seeking removal of the 50-basis-point RTO participation ROE adder for CL&P and UI and refunds of charges imposed after the complaint’s refund effective date. CL&P and UI separately challenged the constitutionality of Connecticut Public Act 25-173, which requires ISO-NE membership, in Connecticut federal court on June 29, 2026. Eversource estimates that eliminating the adder would reduce annual after-tax earnings by approximately $12 million using 2025 actual data. The outcome of the regulatory and court proceedings remains uncertain.

Key facts

• If FERC eliminates the RTO ROE incentive as proposed in the Connecticut RTO Adder Complaint, Eversource estimates an annual after-tax earnings impact of approximately $12 million using 2025 actual data.
• On June 11, 2026, Connecticut agencies filed a FERC complaint against CL&P and UI seeking elimination of their 50-basis-point RTO participation ROE adders and refunds of adder-related charges imposed after the complaint’s refund effective date.
• On June 29, 2026, CL&P and UI filed a Connecticut federal district court complaint asserting that Connecticut Public Act 25-173 is unconstitutional in requiring ISO-NE membership.
• On July 1, 2026, CL&P and UI asked FERC to hold the Connecticut RTO Adder Complaint in abeyance until the Connecticut federal court proceeding is resolved.
• On September 25, 2026, Connecticut agencies asked the U.S. District Court to dismiss CL&P and UI’s complaint and stay discovery.
• Eversource cannot predict the ultimate outcome of the Connecticut RTO regulatory or court complaints.

Impact estimates