Duke Asks South Carolina to Approve 50 GW by 2041, With 14 GW of Gas Against 13 GW of Storage
- Policy & Markets Regulatory State & Local Regulation
Marin Holt
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- New solar by 2041: 18.5 GW
- New energy storage: 13 GW
- New natural gas: 14 GW
- New nuclear: 4.5 GW
- Winter peak growth: more than 10 GW
Duke Energy has asked South Carolina regulators to approve a new resource plan. It adds about 50 GW of generating capacity across the Carolinas by 2041. The utility announced the filing on August 17, 2026, with the Public Service Commission of South Carolina. The plan calls for 18.5 GW of solar and 13 GW of energy storage. It adds 14 GW of natural gas and roughly 4.5 GW of new nuclear. Duke’s winter peak is forecast to rise by more than 10 GW over the same period, a cumulative increase of about 30 percent.
The gas number is the one to watch. Duke’s 14 GW splits into 8.2 GW of combined cycle plants and 5.8 GW of combustion turbines. That total edges out the 13 GW of storage in the same plan.
Fifty gigawatts of nameplate for ten gigawatts of peak
The ratio deserves attention. Duke proposes roughly five units of nameplate capacity for each unit of winter peak growth. Solar carries most of that gap. A solar fleet in the Carolinas produces nothing at the winter morning peak. So 18.5 GW of panels answers summer afternoons, not January mornings. Storage and gas cover the hours solar does not.
That arithmetic explains the shape of the portfolio. It also explains why the storage figure sits so high. A 13 GW battery fleet shifts afternoon solar into the evening, and combustion turbines handle the rest.
Parts of the plan are already moving
Regulators have already approved a 1,400 MW combined cycle plant in Anderson County, South Carolina. Duke has an open request for proposals for 400 MW of standalone storage in the state. The company keeps a target of at least 1 percent annual energy efficiency savings.
On nuclear, Duke wants to run its existing fleet for up to 80 years. Two of its six nuclear sites hold subsequent renewed operating licenses, covering four of the fleet’s 11 units. Both sites are in South Carolina. For new capacity the company has named two candidate sites. They sit in Cherokee County, South Carolina and Stokes County, North Carolina.
Duke Energy’s operations hold about 55,700 MW of capacity in total. The Carolinas plan would add close to a further 50 GW in one 15-year block.
Why It Matters
Storage developers and solar bidders in the Carolinas now have a numbered target to size their pipelines against. The 400 MW standalone storage RFP is the near-term opening, while Duke’s 13 GW figure sets the ceiling for the decade ahead. Intervenors have a clear line of attack in the 14 GW of gas. A plan that builds more gas than storage invites an obvious question. What does the storage displace? Watch the hearing set for April 2027 and the order expected in June 2027. Duke filed in South Carolina first. The North Carolina proceeding will test the same numbers against a different commission and statute.
Critical Perspective
The headline number is the least useful one in this plan. Duke’s binding constraint is the winter peak, and it expects that peak to rise by more than 10 GW. A solar fleet contributes almost nothing at a January morning peak in the Carolinas. So 18.5 GW of panels does little for the problem the plan says it solves.
The firm capacity here is the 14 GW of gas and the 4.5 GW of nuclear. Add whatever the 13 GW of storage still holds at seven in the morning, after a long winter night. Four-hour batteries do not cover a multi-hour winter peak. That is why gas outweighs storage in the portfolio, and it deserves naming plainly.
The nuclear line invites the most scrutiny. Duke names 4.5 GW by 2041 with two candidate sites and no reactor technology chosen. Two of its six existing sites already hold subsequent renewed licenses, which is real progress on the fleet it owns today. New build is a different proposition. Of every figure in this filing, 4.5 GW has the least behind it.
