MISO Transmission Owners v. FERC, No. 16-1325 (D.C. Cir. 2022)Annotate this Case
The Federal Energy Regulatory Commission is responsible for ensuring that interstate electricity rates are “just and reasonable.” Midcontinent Independent System Operator, Inc. (“MISO”) administers the electric grid on behalf of the companies that own transmission lines. Those transmission owners invested money to build their transmission lines, and MISO must charge customers electricity transmission rates that provide those companies an appropriate return on their investment. That return-on-equity component of the transmission rates, which we’ll just call the Return, is at issue in this case. In this case, a group of customers thought MISO provided transmission owners a too-generous Return. They asked FERC to reduce that aspect of MISO’s rates. FERC did. In the process, it completely overhauled its approach to setting an appropriate Return. Both the customers and transmission owners challenged several aspects of the FERC proceedings as unlawful or arbitrary and capricious.
The DC Circuit agreed with the customers that FERC’s development of the new Return methodology was arbitrary and capricious, thus the court vacated its rate-determination orders and remanded for further proceedings. Because the other challenged aspects of FERC’s orders flow from FERC’s rate determination, the court did not reach them. The court explained that FERC Failed to offer a reasoned explanation for its decision to reintroduce the risk-premium model after initially, and forcefully, rejecting it. Because FERC adopted that significant portion of its model in an arbitrary and capricious fashion, the new Return produced by that model cannot stand.