MISO said 2025 was the most demanding summer since 2012, though it steered the grid with only a single maximum generation event.

MISO’s generator interconnection queue has fallen to 215 GW as developers cut back on projects in response to the federal phaseout of renewable energy tax incentives, RTO leadership said.

MISO will start evaluating its South region for long-term transmission needs in 2026, beginning with Louisiana, the RTO announced before its Board of Directors.

MISO’s Independent Market Monitor said the recently uncovered, eight-year-old repeat error in the RTO’s capacity market that caused a $280 million impact in this year’s auction alone is unfortunate but insisted the resulting prices were efficient.

MISO said a yearslong software error caused it to clear more capacity than intended in past capacity auctions and which has resulted in an approximate $280 million impact to market participants in this year’s auction.

MISO said its nine-year effort to replace its market platform will exceed original budget contingencies and won’t be completed until 2028, three years later than previously predicted.

MISO might replace up to three members on its board of directors as they reach term limits at the end of 2025.

MISO’s 2025 Transmission Expansion Plan has amassed another $2 billion in investment since early spring, bringing its total to $13 billion.

MISO Monitor David Patton called NERC’s Long-Term Reliability Assessment inaccurate for labeling the RTO a high-risk area.