Hughes v. Talen Energy Marketing, LLC
The Court ruled that Maryland's program subsidizing a new power plant was unconstitutional because it effectively set the price the plant received for selling electricity into an interstate wholesale auction, a job the Constitution and federal law give only to federal regulators.
The decision draws a clear line for states trying to encourage new power generation: they can offer subsidies, tax breaks, or other incentives, but they cannot tie those benefits to the price a generator gets in the federally regulated wholesale market.
“The FPA leaves no room either for direct state regulation of the prices of interstate wholesales or for regulation that would indirectly achieve the same result.”
The Court's core statement that states cannot set or indirectly influence federal wholesale electricity rates.
How it got here: A federal trial court ruled for the incumbent generators against Maryland's program; the Fourth Circuit affirmed; Maryland and CPV asked the Supreme Court to review.
The Case in Depth
What happened
Maryland worried that the regional electricity auction wasn't spurring enough new power plant construction in the state. It picked a company, CPV Maryland, to build a new gas-fired plant and forced local utilities to sign a 20-year contract guaranteeing CPV a set price, with payments flowing based on how CPV's electricity sold in the interstate wholesale auction run by PJM Interconnection. Rival power generators sued, arguing this improperly set a wholesale rate.
The question before the Court
Could Maryland guarantee a new power plant a fixed price for electricity it sells into a federally regulated wholesale auction?
The Court's answer
No — the Court ruled that Maryland's program was unconstitutional because federal law gives the Federal Energy Regulatory Commission exclusive authority over interstate wholesale electricity rates, and Maryland's contract effectively substituted its own guaranteed price for the price set by the federally approved auction. Even though Maryland framed the payments as compensation for building a particular kind of power plant, the payments were tied directly to how the plant's electricity sold in the wholesale auction, which made them part of the wholesale rate.
The Court made clear its ruling was narrow: states remain free to encourage new power plants through subsidies, tax breaks, land grants, or other measures, so long as those incentives don't depend on how a generator's electricity fares in the federally regulated wholesale market.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
States across the country have been experimenting with programs to encourage new power plants, especially cleaner energy sources. This ruling tells state regulators they cannot structure subsidies around guaranteed wholesale prices in federally run auctions, though it leaves room for subsidies, tax incentives, or land grants that don't hinge on auction results.
What changes now
The ruling is final on the merits and affirms the Fourth Circuit's judgment invalidating Maryland's program. Maryland and other states can no longer structure subsidies for new generation the way Maryland did, though the Court left open other paths — like tax incentives, land grants, direct subsidies untethered to auction results, or building state-owned plants — for states seeking to encourage new or cleaner power generation.
What this does not decide
The Court stressed its holding was limited: it did not address whether other state measures to encourage new generation, such as tax incentives, land grants, direct subsidies, or state-owned power plants, would also be preempted, so long as those measures don't condition payment on a generator's results in the wholesale auction.
Concurrences and dissents
Concurrence — Justice Sotomayor
Justice Sotomayor joined the majority in full but wrote separately to stress that the Federal Power Act is a 'collaborative federalism' statute where state and federal roles are meant to interlock, so preemption findings in this area should be approached carefully rather than through generic preemption labels. She emphasized that the Court's ruling still leaves room for states to pursue their own energy goals within their own regulatory domain.
Concurrence in part — Justice Thomas
Justice Thomas agreed that Maryland's program was invalid but would have rested that conclusion solely on the text and structure of the Federal Power Act, which he says already gives FERC exclusive jurisdiction over wholesale sales. He declined to join the portions of the majority opinion that also relied on broader implied-preemption principles, seeing the statutory text as a sufficient basis alone.
How the Court got there
The legal reasoning, step by step
- The Court applied basic preemption principles, asking whether Maryland's program stood as an obstacle to Congress's design giving the Federal Energy Regulatory Commission exclusive control over interstate wholesale electricity rates.
- Federal law gives FERC sole authority to ensure that wholesale electricity rates are 'just and reasonable,' and FERC had approved the regional grid operator's auction as the sole mechanism for setting the price new generators receive for selling capacity into that market.
- Maryland's contract required the new plant to sell its electricity through that same federal auction, but then had utilities pay the plant (or the plant pay the utilities) the difference between the auction's clearing price and a separate price Maryland had negotiated, effectively substituting Maryland's own price for the auction's.
- The Court distinguished this arrangement from ordinary long-term contracts between utilities and generators, because those contracts transfer ownership of electricity outside the auction, while Maryland's arrangement operated entirely within the auction and depended on the plant actually clearing it.
- Relying on earlier decisions holding that states cannot second-guess wholesale rates FERC has approved, the Court concluded that Maryland's program crossed the line between permissible state encouragement of new power plants and impermissible interference with a price federal regulators control.
Doctrinal impact
Cases affected by this decision
Reaffirms Mississippi Power & Light Co. v. Mississippi ex rel. Moore (487 U.S. 354)
The Court relied on this case's rule that states cannot second-guess wholesale rates FERC has approved as reasonable.
Reaffirms Nantahala Power & Light Co. v. Thornburg (476 U.S. 953)
The Court used this case's rule that states must give effect to FERC's exclusive authority over wholesale rates.