The ISO Market Edge Newsletter

Stay in-the-know about power market changes, delivered to your inbox.

Key market changes in the ISO/RTO power markets:

  • Technical or operational insights that impact market participants

  • Commentary from subject-matter experts within Hartigen's team

  • Analysis to help market participants stay ahead of trends and developments in energy market operations

  • Understanding of market shifts, initiatives, and operational or regulatory developments

  • Relevant updates and enhancements to the PowerOptix platform

SPP Katie Zautke SPP Katie Zautke

SPP’s RTO Expansion: A Major Milestone for U.S. Power Markets

The Southwest Power Pool (SPP) is preparing for one of the most significant market expansions in North America. On April 1, 2026, most participants in the Western Energy Imbalance Service will transition into SPP’s Integrated Marketplace, gaining full regional transmission organization (RTO) services and broader market access. This expansion positions SPP as the first U.S. RTO to operate across both the Eastern and Western Interconnections, enabling more coordinated operations, enhanced reliability, and long-term economic efficiencies across a larger regional footprint.

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