Environmental advocates are hailing a decision by Massachusetts regulators that will give more than 1.3 million households access to lower winter electricity prices if they use a heat pump in their home.

Public utilities regulators on Monday ordered National Grid, the state’s second-largest electric company, to develop a lower, seasonal rate for houses with heat pumps. The decision comes three months after the state approved a similar rate plan by Unitil, an electric utility that serves 108,500 Massachusetts households.

“They hit the nail on the head here,” said Kyle Murray, Massachusetts program director for climate and energy nonprofit Acadia Center.

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