Wire
MISO customers could still see backdated refunds
The court let FERC apply a new return rate retroactively through Oct. 17, 2024, keeping alive a fight over charges already paid on the regional grid.
Electric bills tied to the Midcontinent Independent System Operator, or MISO, grid can still be unwound years after they were paid. The D.C. Circuit said the Federal Energy Regulatory Commission, or FERC, could reach back and order refunds on disputed transmission charges after resetting the return rate, even though earlier orders in the fight had already been vacated.
That matters because the ruling keeps alive the possibility that customers will see money back on past bills, while transmission owners may still face repayment for charges collected over a long stretch of time. The court treated the refund question as a live one, not a closed chapter.
The years on the clock
The transmission owners did not dispute FERC's authority to order refunds for an earlier 15-month period, from Nov. 12, 2013, to Feb. 11, 2015. Their fight was narrower. They said FERC went too far when it used section 309 of the Federal Power Act to make a new return rate effective Sept. 28, 2016.
FERC then ordered refunds from that date through Oct. 17, 2024. That created a long retroactive refund window, one that reaches far beyond the uncontested period and captures years of charges already built into bills.
Why the line matters
If FERC can backdate refunds that far, it keeps a powerful tool for fixing old rates after losing in court. If it cannot, a long stretch of disputed MISO charges would remain in place for customers who already paid them.
The ruling does not hand out the refunds itself. It says the agency may still have the power to order them, which leaves the financial impact to the next round of calculations and compliance. For households and businesses on the MISO grid, the question is whether old transmission costs stay locked in or get sent back to where they started.