MISO is to roll out a new transmission warning declaration to give its members advanced notice when scarce transmission capacity is raising the risk of load shed.

MISO South states have signaled their intent to strike out on their own on a cost allocation design for long-range transmission projects located exclusively in the South subregion.

MISO announced it will honor a request from Texas regulators and include southeastern Texas in its first long-range transmission study for MISO South.

MISO’s Independent Market Monitor said a MISO South September transmission emergency shows the RTO needs a better handle on constraint management within its markets.

MISO said its first crack at long-range transmission planning in the South region likely would take about three years to culminate in potential project recommendations.

Stakeholders told MISO they need a better explanation of the every-other-day capacity advisories issued for MISO South, which have become customary since the beginning of summer.

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

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 and several stakeholders came to the defense of the RTO’s $21.8 billion, 24-project long-range transmission plan portfolio for the Midwest as five Republican states seek to repeal the projects’ approval.