The Democrat had urged the Department of Public Utilities to recalculate Eversource's recently approved rate hike to reflect the reduction of the federal corporate tax rate from 35 to 21 percent.
Healey said that in its filing Wednesday, Eversource proposed lowering existing rates for NStar Electric customers by about $35 million and to increase rates for its Western Massachusetts Electric Company customers by $16 million, instead of the $25 million approved by the DPU.
Healey has also pushed to have the rates for all major electricity, gas, and water companies recalculated to reflect the lower corporate tax rate.
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