Massachusetts Attorney General Andrea Joy Campbell has forced Eversource to return $45 million to customers, ending a yearslong fight over disputed charges and merger-related costs.

A settlement agreement approved by the Department of Public Utilities closes 16 dockets dating back to 2011 involving vegetation-management expenses, pension-related cost allocations, and charges tied to Eversource's 2020 acquisition of Columbia Gas of Massachusetts.

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NSTAR Electric customers are slated to receive roughly $20 million in credits beginning Jan. 1, 2026, while customers of Eversource Gas of Massachusetts are projected to see more than $25 million in annual savings once rates are reset following the Columbia Gas integration.

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