FERC on Tuesday accepted a MISO tariff filing, promising to annually update an unforced capacity-to-intermediate seasonal accredited capacity ratio.

MISO this week said it will likely operate with almost no firm generating capacity to spare to manage typical summertime peaks.

MISO executives said the capacity market still needs fixing, warning that the surplus gained from last week’s auction is fleeting without long-term changes.

The results of MISO’s inaugural seasonal capacity auctions, released late Wednesday, showed sufficient supply for the 2023/24 planning year.

The Illinois Commerce Commission questioned MISO and PJM officials on their respective RTOs’ preparations for summer, with some concerned about reliability.

FERC approved MISO’s reworked ratio for use in its capacity auction a day before MISO began accepting offers on the postponed auction.

MISO will fire up its capacity auction machinery beginning April 18 after it was forced to delay the auction last month on a FERC order.

Two competitive electricity organizations have protested FERC’s show-cause order to MISO that will ultimately downsize resources’ capacity accreditation values.

FERC Commissioner James Danly paid an unannounced visit to MISO’s board meeting following a snag in the RTO’s new capacity accreditation process.

FERC Commissioner James Danly paid a surprise visit to MISO’s Board of Directors meeting following a snag in the RTO’s new capacity accreditation process.