LACEY, Wash. – Today, the Washington Utilities and Transportation Commission announced its ordering Avista to refund rates that the company over-collected. It rejected tariff sheets Avista filed in October 2024 and revised in December 2025.
It wrote in a press release:
The commission previously allowed Avista’s rate increase to recover costs related to the coal-fired Colstrip power plant, subject to refund. After considering the full record, the commission ordered Avista to file new tariff sheets that will result in a $5.86 million decrease in revenue. The decrease will be refunded to customers starting in January 2026 for rates Avista overcharged related to Colstrip.Avista sought recovery for capital investments made in the coal plant in 2024 and 2025. The commission denied full recovery of the investments. Instead, they required Avista to prorate the amounts and not charge customers for any coal investments with an in-service date after Jan. 1, 2026, as they will no longer be necessary or useful to Washington customers. The commission allowed full recovery of investments made to protect health and safety at the plant.
It’s unclear how much each customer will receive.
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