Duke Energy says dropping carbon limits saves $10 billion, but the number appears in no regulatory filing
Duke Energy's new Carolinas Resource Plan sizes the grid build around 7.8 GW of signed hyperscaler deals and claims $10 billion of savings from dropping greenhouse-gas limits. The claim is not in its filings, and the fight over the caps runs on the same clock as the mid-November tariff vote.
Vincent Jiang · 3 min read
Duke Energy wants North Carolina regulators to treat one number as the whole story: $10 billion. That is what the utility says ratepayers and its own balance sheet save if the state drops greenhouse-gas limits for power plants, a claim CEO Harry Sideris made after the EPA repealed the 2024 Biden-era carbon rules 1. The number is doing heavy lifting: it is the build-side argument for a $103 billion capital plan that has to serve 7.8 gigawatts of signed data-center deals with Microsoft+2.65% — Microsoft, up 2.65 percent today, Amazon+2.85% — Amazon, up 2.85 percent today, Digital Realty and QTS 3. But the claim has a problem: it does not appear in any of Duke's public filings to state regulators, and the analysts who read those filings say they cannot find where it comes from 1.
The plan sizes the build for the machines, and the caps are in the way
Duke's 2026 Carolinas Resource Plan, filed with the Carolina regulators this summer, is the build sheet: 18.5 GW of new solar, 14 GW of gas (8.2 combined cycle, 5.8 combustion turbines), 13 GW of storage and about 4.5 GW of nuclear through 2041, sized for a winter peak growing more than 10 GW 5. Under the old EPA limits, Duke's own models would have added 9.7 GW more solar, 2.4 GW of offshore wind and 500 MW of batteries, and skipped two gas plants totaling 1.8 GW; without the caps, three coal plants stay open about two years longer 1.
Dropping the carbon caps cuts 12.6 GW of clean build but keeps two gas plants and coal alive
Data
| Value | |
|---|---|
| Solar forgone | 9.7 GW |
| Offshore wind forgone | 2.4 GW |
| Batteries forgone | 0.5 GW |
| Gas plants skipped | -1.8 GW |
That is the trade in one picture: renewables and two gas plants out, coal life extended in. Duke still builds solar, storage and wind under the new path 1.
The $10 billion is unaudited, and the repeal is contested
"It's frustrating to try and understand where Duke is pulling these numbers from. Even in their resource plan, it doesn't appear anywhere," said Sue Sturgis of the Energy and Policy Institute 1. Duke representatives told The News & Observer the figure is an estimate of reduced resource spending, with no detailed breakdown 1. The EPA repeal itself is under legal challenge from North Carolina Attorney General Jeff Jackson and 20 other state AGs, who argue it violates the Clean Air Act 1. Duke University's Martin Ross warns that if carbon rules return, utilities that pivoted hard to fossil generation pay a "pretty significant price tag" to pivot back 1.
The other half of the deal
The companion to the caps fight is the pay-side: an Oct 7 settlement with the NC Public Staff, Amazon, Google, Meta−0.27% — Meta, down 0.27 percent today, Microsoft and the Department of Defense requiring large loads of 50 MW or more at an 80% load factor to pay upfront, nonrefundable, for grid connections, with NCUC approval expected by mid-November 4. That shifts connection costs off existing customers. What it does not settle is the fuel-path question: whether the resource plan's gas-and-coal lean survives a contested docket, and whether the load shows up. Duke's 2026 adjusted EPS guidance of $6.55 to $6.80, raised in February on data-center demand, assumes the capital converts to rate-base earnings on Duke's timeline 3. The commissions' rulings, by November and through 2027, decide whether it does.
Deepdive
AI-generated from this story and its cited sources. Not investment advice.
