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EPA Power Plant Rule Changes: What Ohio Buyers Should Know

Ohio market insight · Rates & regulation

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The short answer

Between February and September 2026, EPA finalized the rescission of the 2009 greenhouse gas endangerment finding for vehicles, repealed the 2024 amendments to its mercury and air toxics standards (MATS) for power plants, and repealed most of the 2024 carbon standards for power plants, while proposing to remove the rest. These changes lower compliance costs for coal and gas plants and remove some reasons to retire them, mostly in the 2030s. They cannot change PJM capacity prices already set through May 2029, and their effect on later prices depends on plant economics and on litigation that is still under way.

What EPA has done, and where each action stands

Status as of September 27, 2026:

Action What it does Status
2024 power plant carbon standards (Clean Air Act section 111) The 2024 rule required carbon capture on existing coal units operating long-term and on new baseload gas turbines, and natural gas co-firing for coal units retiring in the 2030s, with key compliance dates in 2030 and 2032 Final partial repeal signed Sept. 14, 2026 (Federal Register Sept. 17). Repealed the carbon-capture standards for existing coal and new baseload gas, the existing-coal emission guidelines, and the 40% co-firing requirement
Remaining power plant greenhouse gas standards EPA proposes to repeal the remaining efficiency standards for new turbines and to conclude that section 111 does not authorize regulating power plant greenhouse gas emissions Proposed Sept. 2026; public hearing Oct. 1; comments due Nov. 2, 2026
2009 endangerment finding Rescinds the finding underpinning federal greenhouse gas regulation and repeals vehicle greenhouse gas standards Final rule published Feb. 18, 2026, effective Apr. 20, 2026; challenged in the U.S. Court of Appeals for the D.C. Circuit
MATS 2024 amendments Repeals the tighter filterable particulate limit for coal plants, the tighter mercury limit for lignite units and the requirement for particulate continuous monitors; the 2012 MATS rule stays in force Signed Feb. 19, 2026; published Feb. 24, 2026. EPA estimates about $670 million in avoided compliance costs from 2028 to 2037

A related action came from a different agency. Since May 2025, the Department of Energy has issued emergency orders under section 202(c) of the Federal Power Act requiring several plants to keep running past planned retirement, including the J.H. Campbell coal plant in Michigan and the Eddystone units in Pennsylvania. On September 11, 2026, the D.C. Circuit held that DOE exceeded its authority in the Campbell orders and vacated them, calling section 202(c) a narrow backstop for genuine emergencies. Further appeals are possible.

How rule changes connect to what Ohio businesses pay

The link runs through capacity, not through a line on your bill:

  1. Compliance costs affect whether an owner keeps an older plant running, upgrades it, converts it or retires it.
  2. Retirement decisions change how much capacity is offered into PJM's auctions.
  3. Auction results set the capacity price, which reaches every Ohio shopping and default-service customer through their capacity tag.
  4. Operating costs have a smaller effect on wholesale energy prices in hours when those plants set the price.

The supply side is already tight. PJM's auctions for 2027/28 and 2028/29 cleared at the price cap ($333.44 and $325.00 per MW-day) and still fell 6,623 MW and 6,831 MW short of the reliability requirement.

What the record shows so far

  • Retirements have slowed. EIA reports that 12.3 GW of U.S. generating capacity was scheduled to retire in 2025, but only 4.6 GW did, the lowest since 2008, partly because of DOE emergency orders. About 11 GW was planned for 2026, 58% of it coal, and EIA noted those plans may be more likely than usual to change.
  • An Ohio example. In December 2025, Vistra said it would keep the Miami Fort plant in Hamilton County running beyond its planned 2027 closure and convert it to natural gas. The announcement did not tie the decision to any specific EPA action. It illustrates that at current capacity prices, keeping or converting existing units can make economic sense on its own.

Outlook: plausible effects, separated from facts

The following is analysis, not a forecast.

  • Through May 2029: no effect on capacity prices, which are already set. Rule changes cannot reopen completed auctions.
  • 2029/30 and later: removing the carbon standards takes away a retirement driver whose deadlines fell in the 2030s. That could keep more existing capacity bidding into auctions late in the decade. The 2029/30 auction (December 2026) will clear within a collar of $175 to about $325 per MW-day regardless.
  • Magnitude: EPA's MATS estimate of roughly $78 million a year nationwide is small against PJM-wide capacity costs. Plant economics, meaning energy and capacity revenue, fuel and maintenance, will still drive most decisions.
  • Uncertainty: the endangerment rescission is in litigation, the section 111 repeal is likely to be challenged, and the D.C. Circuit has narrowed DOE's emergency authority. Rules could be upheld, reversed or changed by a future administration, so plant owners may hesitate to make long-lived investments based on the current rules alone.

What this means for procurement

  • Do not wait for rule changes to lower prices. The capacity prices embedded in 2026–2029 contracts are already known.
  • Weigh gas prices and load growth first. For energy prices, natural gas and data center demand matter more than these rule changes.
  • Read change-in-law clauses. Know whether your supplier can pass through costs from regulatory changes, and in which direction.
  • Sustainability plans are unaffected. You can still buy renewable supply or RECs under Ohio's deregulated market, although Ohio's own renewable requirement is 8.5% for 2026 and ends after 2026.
  • Facilities with their own air permits should review changes with environmental counsel.

For today's capacity shortfall and what it means for businesses, see Ohio's grid reliability crunch. Every auction result is explained in the PJM capacity pillar. For how these factors add up to a 2026–2028 price outlook, see the Ohio commercial electricity outlook.

FAQ

Have the EPA changes lowered Ohio electricity prices?

Not measurably so far. Capacity prices through May 2029 were set in auctions that the new rules cannot reopen, and the compliance savings EPA estimates are small compared with capacity and energy costs.

Will Ohio coal plants stay open longer because of these changes?

Possibly for some units, especially where the repealed carbon standards would have forced decisions in the 2030s. Owners' decisions still depend mainly on market revenue and plant condition, and Ohio's Miami Fort extension was announced as a gas conversion.

Are these rule changes final?

The MATS repeal and the endangerment rescission are final but face or may face court challenges. The partial repeal of the carbon standards is final; the proposal to remove the remaining greenhouse gas standards is open for comment until November 2, 2026.

Do these changes affect my ability to buy renewable energy?

No. Businesses can still choose renewable supply products, buy RECs or sign power purchase agreements through Ohio's competitive market.

Sources

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