California, which imposed rolling blackouts during an oppressive heat wave on two days last month, on Tuesday extended the lives of four aging natural gas plants it has been seeking to retire for a decade.

The unanimous vote by four members of the State Water Resources Control Board follows an analysis last year that identified a potential electricity capacity shortfall beginning in the summer of 2021, according to agency documents. One board member was absent from the meeting.

During hours of testimony via a video feed, the board heard from public officials, power plant owners and state residents. Many were concerned about electric reliability following last month’s blackouts, while others were eager to put an end to the polluting power plants near their coastal homes.

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