FERC was not persuaded by environmental nonprofits, utilities nor Mississippi regulators to order MISO to rework the sloped demand curve it’s been cleared to use in the spring capacity auction.

The Sierra Club, Natural Resources Defense Council and the Sustainable FERC Project are seeking a rehearing of MISO’s sloped demand curve in its capacity auction.

After two requests for more information and nine months, FERC has greenlit MISO’s plan to exchange its current, vertical curve for sloped demand curves in its seasonal capacity auctions.

FERC once again said it needs more information on clearing price caps before MISO can proceed with sloped demand curves in its capacity auctions.

FERC wants more description behind MISO’s plan to adopt sloped demand curves for its capacity auctions before it decides the matter.

Stakeholders appear divided over MISO’s proposal to use a downward sloping demand curve in its capacity auction, with criticisms mostly aimed at a provision to allow utilities to opt out of the auction for three years at a time.