Eversheds Sutherland Coop Law Blog
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Southwest Power Pool Becomes First RTO to Span Two Interconnections

Southwest Power Pool (SPP) completed a historic expansion into the Western Interconnection on April 1, 2026, and now serves 17 states. The expansion, led by nine load serving utilities in seven western states, is expected to enhance grid reliability and reduce wholesale energy costs through access to SPP’s transmission network.

Southwest Power Pool Starts Energy Balancing Market in West

Southwest Power Pool announced on Monday, February 1, that at midnight it launched its Western Energy Imbalance Service (WEIS) market. Several regional utilities are participating in this WEIS market, including Basin Electric Power Cooperative, Deseret Power Electric Cooperative and Tri-State Generation and Transmission Association.