Tri-State Generation and Transmission Association v. FERC

── Tri-State Generation and Transmission Association v. FERC ── Case No.: 24-9516 Court: Court of Appeals for the Tenth Circuit Date: March 24, 2026 Category: General Appellate Case: 24-9516 Document: 149-1 Date Filed: 03/24/2026 Page: 1 FILED United States Court of Appeals PUBLISH Tenth Circuit UNITED STATES COURT OF APPEALS March 24, 2026 Christopher M. Wolpert FOR THE TENTH CIRCUIT Clerk of Court _________________________________ TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC., Petitioner, v. No. 24-9516 FEDERAL ENERGY REGULATORY COMMISSION, Respondent, -------------------------------------- BASIN ELECTRIC POWER COOPERATIVE; MOUNTAIN PARKS ELECTRIC, INC.; UNITED POWER, INC.; LA PLATA ELECTRIC ASSOCIATION, INC.; NORTHWEST RURAL PUBLIC POWER DISTRICT, Intervenors. ––––––––––––––––––––––––––––––––––– TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC., Petitioner, v. No. 24-9538  Appellate Case: 24-9516 Document: 149-1 Date Filed: 03/24/2026 Page: 2 FEDERAL ENERGY REGULATORY COMMISSION, Respondent. ----------------------------- UNITED POWER, INC.; LA PLATA ELECTRIC ASSOCIATION, INC.; BASIN ELECTRIC POWER COOPERATIVE; MOUNTAIN PARKS ELECTRIC, INC., Intervenors. ––––––––––––––––––––––––––––––––––– TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC., Petitioner, and SAN MIGUEL POWER ASSOCIATION, INC.; BASIN ELECTRIC POWER COOPERATIVE, Intervenors - Petitioners, v. No. 25-9522 FEDERAL ENERGY REGULATORY COMMISSION, Respondent, and UNITED POWER, INC.; LA PLATA ELECTRIC ASSOCIATION, INC.; 2  Appellate Case: 24-9516 Document: 149-1 Date Filed: 03/24/2026 Page: 3 MOUNTAIN PARKS ELECTRIC, INC.; NORTHWEST RURAL PUBLIC POWER DISTRICT, Intervenors - Respondents. ––––––––––––––––––––––––––––––––––– TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC., Petitioner, v. No. 25-9544 FEDERAL ENERGY REGULATORY COMMISSION, Respondent. ---------------------------------- UNITED POWER, INC.; MOUNTAIN PARKS ELECTRIC, INC.; NORTHWEST RURAL PUBLIC POWER DISTRICT, Intervenors. _________________________________ Petitions for Review of Orders from the Federal Energy Regulatory Commission (FERC Nos. ER21-2818, ER21-2818-002, ER21-2818-004, ER21-2818-005, ER21-2818-006, ER21-2818-007) _________________________________ Misha Tseytlin of Troutman Pepper Hamilton Sanders LLP, Chicago, IL (Fredrick Wilson and Russell Kooistra of Troutman Pepper Hamilton Sanders LLP, Washington, DC, Jeff P. Johnson of Troutman Pepper Hamilton Sanders 3  Appellate Case: 24-9516 Document: 149-1 Date Filed: 03/24/2026 Page: 4 LLP, Richmond, VA, and Kenneth F. Rossman IV of Lewis Roca Rothgerber Christie LLP, Denver, CO, with him on the briefs), for Petitioner. Carol J. Banta, Deputy Solicitor (David L. Morenoff, Acting General Counsel, and Robert H. Solomon, Solicitor, with her on the briefs), of Federal Energy Regulatory Commission, Washington, DC, for Respondent. Jesse Halpern (Anthony F. Blum, Rebecca L. Shelton, Nicole S. Allen, Clifford Godiner, Peter K. Matt, and Jenna C. Cliatt with her on the briefs), of Thompson Coburn LLP, Washington, DC, for Intervenor Basin Electric Power Cooperative. Norman C. B