ES · 10-Q · 2026Q3 · Full report

Grid Modernization and Reliability

EVERSOURCE ENERGY · 2026-11-06 · Importance 25 · Surprise 24 · In source text

Eversource says its transmission projects in Connecticut, Massachusetts and New Hampshire are intended to improve grid reliability, meet customer demand for power and strengthen resilience. The Greater Cambridge Energy Program is building the company’s first underground transmission substation, with associated lines and duct banks, to address increased electric demand in the Cambridge region; the project is estimated to cost approximately $1.84 billion. ISO-NE selected a joint Eversource–Central Maine Power proposal as its preferred solution for a project intended to increase transmission capacity between Maine and New Hampshire, strengthen the northern-to-southern New England interface and accommodate at least 1,200 MW of onshore wind. Eversource’s share of that project’s estimated $2.2 billion cost is approximately $700 million, with service anticipated in 2032.

Key facts

• In September 2026, ISO-NE selected Eversource's joint proposal with Central Maine Power as the preferred solution for a transmission project; Eversource's share of the estimated $2.2 billion cost is approximately $700 million, with service anticipated in 2032.
• Eversource's Greater Cambridge Energy Program is estimated to cost approximately $1.84 billion: $1.38 billion for transmission and $460 million for distribution.
• The Greater Cambridge Energy Program's initial in-service date is June 2029; the first distribution circuits are planned by the end of 2029, with remaining circuits placed in service through 2030 and into 2031.
• The selected Maine-New Hampshire transmission proposal is designed to accommodate interconnection of at least 1,200 MW of onshore wind.
• By September 30, 2026, Eversource had spent $300.4 million on the Greater Cambridge Energy Program, including $234.8 million for transmission and $65.6 million for distribution.
• NSTAR Electric’s earnings decreased partly due to lower earnings from its grid modernization tracking mechanism.
• Eversource stated its transmission projects in Connecticut, Massachusetts and New Hampshire include line upgrades, new interconnection facilities, substations and lines, and substation enhancements to improve reliability and resilience.
• CL&P’s increase in other delivery revenues was due to higher revenues from its capital tracking mechanism as electric system improvements increased.

Impact estimates