AMEREN ILLINOIS COMPANY v. FERC

No. 20-1277. Consolidated with 20-1450, 21-1154, 21-1254.

58 F.4th 501 (2023)

AMEREN ILLINOIS COMPANY, d/b/a Ameren Illinois, et al., PETITIONERS v. FEDERAL ENERGY REGULATORY COMMISSION, Respondent. Southwestern Electric Cooperative, et al., Intervenors.

United States Court of Appeals, District of Columbia Circuit.

Decided January 24, 2023.


Attorney(s) appearing for the Case

Misha Tseytlin argued the cause for petitioners. With him on the briefs were Kevin M. LeRoy , Christopher R. Jones , Justin T. Golart , and Katherine J. O'Konski .

Susanna Y. Chu , Attorney, Federal Energy Regulatory Commission, argued the cause for respondent. With her on the brief were Matthew R. Christiansen , General Counsel, and Robert H. Solomon , Solicitor. Anand Viswanathan , Attorney, entered an appearance.

Michael Postar and Bhaveeta K. Mody were on the brief for intervenors Southwestern Electric Cooperative, et al. in support of respondent.

Before: Pillard and Katsas, Circuit Judges, and Rogers, Senior Circuit Judge.


The petitions for review seek reversal of a refund order by the Federal Energy Regulatory Commission upon finding a discrepancy in petitioner Ameren Illinois's self-reported operational costs. Instead of reporting construction-related materials and supplies costs on line 5 of page 227 of Form 1, Ameren Illinois reported...

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