FERC Approves SPP Topology Plan to Cut Grid Congestion
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- FERC on Wednesday approved the Southwest Power Pool's proposal for using topology optimization to reduce grid congestion, with market participants or the grid operator able to submit reconfiguration proposals triggered by plant outages or grid constraints.
- A study by NewGrid, SPP, and the Brattle Group found historical system operating limit violations could be eliminated for 75% of analyzed constraints, with potential congestion cost savings of $18 million to $44 million a year.
- SPP cited the Midcontinent Independent System Operator's success with economic topology reconfiguration, which MISO began using in 2024 and has saved $95 million through August of this year, per an Aug. 18 staff presentation.
- Evergy, Enel North America, and EDF Power Solutions told FERC that SPP's congestion costs averaged $1.6 billion annually over the last three years, while SPP curtailed an average of 1,382 MW of wind and solar throughout 2025—a reliability risk the companies flagged as a concern.
- FERC commissioners Judy Chang and David Rosner issued concurring statements urging other grid operators to adopt topology optimization, with Chang calling it a way to integrate more load and generation while reducing consumer costs.
- The Electric Reliability Council of Texas is set to implement a topology optimization mechanism early next year, according to SPP's filing.
Why it matters: SPP's $1.6 billion annual congestion tab and 1,382 MW of curtailed renewables make the grid operator a high-value proving ground for topology optimization, and FERC commissioners explicitly used the approval to pressure other RTOs to follow suit—putting MISO's $95 million in 2025 savings and a looming ERCOT rollout on the table as benchmarks.
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