Eversource has requested an electric rate decrease from Massachusetts regulators that if approved could cut household electric bills in a large portion of the state an average of 20 percent.

The supply price rate _ the cost of purchasing power from generators _filed by Eversource on Wednesday is for basic service customers.

It would apply to customers in the eastern parts of the state and would save the average residential customer about $25 per month.

If approved by the Department of Public Utilities, the new rates would take effect July 1.

Electric rates soared to historic highs during the winter but Craig Hallstrom, president of Massachusetts Electric Operations at Eversource, says prices are returning to near where they were last summer.

Eversource has more than 1 million customers in eastern Massachusetts.  (Associated Press)

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