Southwest Power Pool, Inc., AEP Oklahoma Transmission Company, Inc., AEP Southwestern Transmission Company, Inc., Deseret Generation & Transmission Co-operative, Inc., Empire District Electric Company, Evergy Kansas Central, Inc., Evergy Kansas South, Inc., Evergy Metro, Inc., Evergy Missouri West, Inc., GridLiance High Plains LLC, ITC Great Plains, LLC, Mountrail-Williams Electric Cooperative, NextEra Energy Transmission Southwest, LLC, NorthWestern Energy Public Service Corporation, Oklahoma Gas and Electric Company, Prairie Wind Transmission, LLC, Public Service Company of Oklahoma, Southwestern Electric Power Company, Southwestern Public Service Company, Transource Missouri, LLC, Transource Oklahoma, LLC, Tri-State Generation and Transmission Association, Inc., Upper Missouri G. & T. Electric Cooperative, Inc.; Notice of Institution of Section 206 Proceeding and Refund Effective Date

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