FERC rejected SPP’s request to remove its day-ahead must-offer requirement, saying the RTO had not provided “sufficient support” for the Tariff revisions.

FERC rejected the CAISO effort to refund $217 million that the ISO said were overcharged for payments to generators operating under must-offer obligations.

FERC last week eliminated the must-offer obligation in effect throughout WECC since the tail-end of the California energy crisis of 2000-2001.