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Spokane-based Avista Corp. is making plans to be financially ready to shutter Colstrip power plant by 2027.

One of the coal-fired power plant’s six corporate owners, Avista reached an agreement with Idaho utility regulators to be fully depreciated by December 2027. The utility with customers in Idaho, Washington and Montana had already agreed to a 2027 deadline in its home state. The dates sync up the eastern Washington utility with Puget Sound Energy, which agreed in 2017 to be financially prepared for closure by 2027.

Avista has a few Montana customers in the Noxon area in northwest Montana, where it operates a hydroelectric dam.

“We have reached an agreement in Washington that sets the same 2027 depreciation schedule for Colstrip,” said Mary Tyrie, Avista spokesperson. “In Montana we don’t have a commission docket open and don’t plan to file one related to depreciation.”

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Early in 2018, in an attempt gain regulatory approval for a merger with Ontario-based Hydro One, Avista had made plans to depreciate its Colstrip interests by 2027. That deal fell apart after Canadian elections changed the direction of partly government-owned Hydro One. Previously, Avista planned to depreciate its interest in Colstrip Unit 3 by 2034 and Unit 4 by 2036.

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