Constellation Energy Generation LLC v. FERC, No. 23-1790 (3d Cir. 2024)
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In this case, a group of electricity providers challenged orders by the Federal Energy Regulatory Commission (FERC), arguing that FERC allowed a new auction rule to apply retroactively to a pending auction. The auction was overseen by PJM Interconnection L.L.C., a FERC-regulated wholesale market operator. PJM had halted the auction upon realizing that the results could lead to a high clearing price for a particular region due to a faulty assumption regarding the participation of certain resources. PJM sought and received permission from FERC to amend the tariff to allow it to adjust the Locational Deliverability Area (LDA) Reliability Requirement downward, reflecting the lack of participation of certain resources.
The petitioners argued that this violated the filed rate doctrine, which prohibits retroactive rates. The court agreed, finding that the tariff amendment was retroactive because it altered the legal consequence attached to a past action: it allowed for the use of a different LDA Reliability Requirement than the one PJM had calculated and posted. The court noted that equitable considerations did not factor into the application of the filed rate doctrine, emphasizing the importance of predictability in the electricity markets.
The court granted the petitions and vacated the orders in relevant part, specifically the portion of FERC’s orders that permitted PJM to apply the tariff amendment to the 2024/25 capacity auction.
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