TVA gets a permit to build a BWRX-300 small reactor, the first in the U.S., GE Vernova and TVA say

September 2026 — The Nuclear Regulatory Commission issued construction permit CPAR-2 to the Tennessee Valley Authority for Clinch River Nuclear Unit 1, a BWRX-300 small modular reactor in Tennessee. Here's what happened, what it cost, and what went wrong.

Cost and outcome (as of October 5, 2026)

Outcome: an immediately effective construction permit, issued Sept. 28, 2026. (Federal Register notice)
Reactor: one GE Vernova Hitachi BWRX-300, which GE Vernova describes as a 300-MW design. (GE Vernova release)
Cost: not disclosed. TVA says it is still negotiating cost sharing with industry partners. (TVA release)
Start date: none announced. (TVA release)
Construction only. The permit authorizes TVA to construct the facility; it doesn't cover operation. (Federal Register notice)

What the NRC found

The permit authorizes TVA to build a power reactor facility in Roane County, Tennessee. The NRC found "reasonable assurance" that safety questions will be "satisfactorily resolved by the completion of construction" and that the plant can be built and run at the site "without undue risk to public health and safety," subject to the permit's conditions. (Federal Register notice)

It also found TVA technically and financially qualified to construct the facility, and that the conditions of TVA's early site permit, ESP-006, had been met apart from those carried into the construction permit. (Federal Register notice)

Why TVA calls it a first

TVA says it is now "the first U.S. utility permitted to construct the BWRX‑300 SMR" and that this is "only the second advanced reactor construction permit ever issued in the nation." It said the NRC issued the permit ahead of schedule. (TVA release)

"This construction permit is more than a regulatory achievement – it's foundational for America's nuclear future," said Mike Skaggs, TVA's interim president and CEO. (TVA release)

GE Vernova said TVA filed its application in April 2025, building on the existing early site permit, and that the site sits near the Energy Department's Oak Ridge National Laboratory. (GE Vernova release)

What an SMR is, per TVA

TVA describes SMRs as reactors that generate up to 300 megawatts of electricity, about one-third the size of traditional units, with major components built in factories and shipped to the site. It says that cuts construction time, cost and complexity. Those are the utility's descriptions, not results from Clinch River. (TVA release)

TVA's chief nuclear officer, Matt Rasmussen, thanked the NRC for its "leadership, transparency, and commitment to safe, effective nuclear development." (TVA release)

The fleet pitch

"Fleet deployment is essential to scaling nuclear energy in the United States," said Jason Cooper, CEO of GE Vernova Hitachi Nuclear Energy, arguing that a standard design lets lessons carry from one project to the next. (GE Vernova release)

GE Vernova linked the permit to Ontario Power Generation's Darlington project, where it said nuclear construction is underway, and said Blue Energy filed the first part of a BWRX-300 permit application in September 2026 for a gas-plus-nuclear project in Texas. (GE Vernova release)

Who pays

TVA says it "continues negotiations with industry partners to ensure responsible cost sharing and financial accountability throughout design and construction." Skaggs said the priority is "ensuring the people of the Valley do not shoulder the costs of first‑of‑a‑kind technology." (TVA release)

TVA describes itself as a corporate agency of the United States that receives no taxpayer funding and gets virtually all its revenue from electricity sales, serving more than 10 million people in seven states. (TVA release)

What went wrong

No start date. TVA says "no construction date has been announced." (TVA release)
Cost sharing is unsettled. TVA is still negotiating with partners so ratepayers don't carry the first-of-a-kind cost. (TVA release)
Construction only. The permit authorizes TVA to construct the facility; it doesn't cover operation. (Federal Register notice)
What we don't know yet: the reactor's cost estimate. Neither release gives one.

Our follow-up question for Tennessee Valley Authority

What is the cost estimate for Clinch River Unit 1, and when do you expect to settle the cost-sharing terms?

Sources

Federal Register, “Tennessee Valley Authority; Clinch River Nuclear Unit 1; Construction Permit and Record of Decision,” Doc. 2026-20345, Oct. 5, 2026. federalregister.gov
Tennessee Valley Authority via PR Newswire, “TVA First U.S. Utility to Receive Construction Permit for BWRX-300 Advanced Nuclear Reactor,” Sept. 29, 2026. prnewswire.com
GE Vernova, “NRC issues first U.S. construction permit for a BWRX-300 small modular reactor at Tennessee Valley Authority's Clinch River site,” Sept. 29, 2026. gevernova.com

Disclosure: [not in copy] Editor placeholder