Summary: Revises Tariff WN U-60, Schedule 91, as required by WAC 480-106-040, proposing standard rates for purchases from Qualifying Facilities of five megawatts or less, updating Estimated Avoided Costs of Energy and Capacity, and requesting a five-year exemption to WAC 480-106-040(1)(b) consistent with the Commission's July 25, 2023 Notice of Change to Electric Integrated Resource Plan Process.