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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Utilities can get more electricity from an existing nuclear plant by raising its maximum licensed power level, a project known as a power uprate. The increase is specific to each reactor: it can depend on measurement accuracy, plant design and operating margins, equipment capability, fuel assumptions, and the analyses regulators require. A planned increase is not the same as an approved or operating one.
How do nuclear plants produce more power?
A nuclear plant produces heat in its reactor, uses that heat to make steam, and drives a turbine-generator to produce electricity. A power uprate raises the maximum power level at which the plant is licensed to operate. Depending on the project, that can involve more accurately measuring how much heat the reactor is producing, changes to plant systems, or new analyses of how equipment and fuel perform at the higher level.
The U.S. Nuclear Regulatory Commission (NRC) describes uprates by their scale and method. One approach, a measurement-based stretch uprate, uses more precise feedwater-flow measurement to calculate reactor power. Better measurement can support a higher licensed limit without implying that every plant needs the same hardware changes or can achieve the same increase.
Why there is no standard percentage
The potential increase depends on margins built into a plant’s design and on its particular operating limits. A utility must analyze relevant plant factors in its license-amendment request. The NRC says an increase may require modifications and analyses involving systems that support reactor power and electricity production. The scope therefore varies by plant; the available project information does not establish a single equipment package that applies to all reactors.
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- Measurement: More precise readings can change how power is calculated and may support a stretch uprate.
- Plant design and margins: The reactor and supporting systems determine what additional output is feasible.
- Fuel and operating assumptions: These must be addressed in the plant-specific technical analysis.
- Licensing: The proposed limit and supporting analyses must be reviewed before the plant can operate under the new limit.
That is why a plant’s age alone does not establish how much more power it can generate. The relevant question is whether the plant’s design, equipment, measurements, operating limits, and safety analyses support a specific increase.
What has to happen before an uprate can raise output?
An uprate changes the maximum power level in a plant’s operating license and technical specifications. Under the NRC’s licensing process, a licensee may change those documents only after the agency approves the application. Approval authorizes operation up to a new limit; it does not, by itself, show that the utility has completed the work or that the plant is already delivering the additional electricity.
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- Develop a plant-specific proposal. The utility identifies the requested increase and assesses how its plant’s measurement methods, equipment, fuel assumptions, and operating limits relate to that proposal.
- Submit a license-amendment application. The request includes analyses of the relevant plant factors and any proposed changes to licensed limits or technical specifications.
- Complete NRC review. The NRC must approve the amendment before the plant can use the higher licensed power limit.
- Implement the authorized changes. If changes or further work are part of the project, their completion is a separate milestone from the license decision.
- Operate and measure the result. Actual output depends on plant operation; it should not be inferred from a planned capacity figure or an approval alone.
These milestones matter when comparing projects. The NRC’s historical approved-uprates record includes plant, percentage, thermal output, approval date, and uprate type. It also illustrates that approval and implementation can diverge: Fort Calhoun’s operator submitted an amendment to return its licensed thermal-power limit to its pre-uprate level before implementing its measurement-uncertainty-recapture uprate.
| Milestone | What it establishes | What it does not establish |
|---|---|---|
| Announced or proposed | A utility, agency, or other party has described a possible project or target. | That the NRC approved it, that work is complete, or that extra output is being delivered. |
| NRC-approved | The license amendment authorizes operation up to the revised licensed power level. | That the utility has implemented the project or is operating at that level. |
| Implemented | The utility has completed the changes it identifies as necessary for the project. | That the plant continuously produces the full additional capacity. |
| Operating output | The electricity actually being generated under real operating conditions. | That a one-time or maximum figure represents typical output over time. |
What is planned at Hatch, Vogtle, and Farley?
On March 12, 2026, the U.S. Department of Energy (DOE) announced the Utility Power Reactor Incremental Scaling Effort, or UPRISE. DOE said six uprates were planned at Hatch, Vogtle, and Farley, together representing 345 megawatts (MW) of additional baseload capacity. That is a combined planned figure, not a measured result. DOE did not provide a plant-by-plant allocation in the announcement, so the 345 MW should not be divided among the sites by inference.
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DOE also set broader UPRISE goals of 2.5 gigawatts (GW) of additional nuclear capacity by 2027 and 5 GW total by 2029. These are program targets, not reported capacity already operating. UPRISE covers more than uprates: DOE describes work that also includes restarts, stalled projects, operating efficiency, advanced fuel technologies, license renewals, and financing partnerships. The overall goals therefore should not be attributed to uprates alone.
DOE said near-term work would assess supply-chain readiness, plant equipment, and economic models to inform investment decisions. The announcement does not identify contractors or suppliers for the six Hatch, Vogtle, and Farley plans. Without project-specific confirmation, it would be misleading to name a company as responsible for their equipment or engineering work.
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How could NRC review affect project schedules?
In a February 2026 summary of NRC-industry meetings held December 11–12, 2025, the Nuclear Energy Institute (NEI) described draft and proposed approaches intended to streamline reviews. NEI said NRC staff had developed a draft risk-informed method that groups technical review areas according to the expected level of review. The summary also discussed linked applications, in which review periods can overlap, and bundled applications that combine related requests.
NEI reported that these strategies were expected to accelerate implementation by years and that NRC staff considered them aligned with expectations. It also described a proposed 12-month NRC review timeline for extended uprates. Those are process expectations reported by an industry association, not a guarantee that a particular application will be reviewed or implemented on that schedule. The approaches described include draft and proposed elements.
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The NRC’s expected-applications table has listed a Constellation extended-uprate filing window for the fourth quarter of 2026 and Southern Nuclear’s Hatch 1 extended uprate for the second quarter of 2027. These are anticipated filing windows, not approvals or changes in plant output; schedules can change, and a filing date is only one step in the licensing process.
How to compare an uprate announcement with a completed project
Capacity figures are easiest to interpret when their status and basis are stated alongside them. For a project-by-project comparison, look for:
- the uprate type and the proposed increase, expressed as a percentage or a capacity figure;
- the plant-specific measurement, equipment, and fuel requirements;
- the status and scope of the NRC license-amendment review;
- the proposed review and implementation schedule, with the source of any timing estimate identified; and
- whether the figure describes a proposal, an NRC-approved limit, completed changes, or actual delivered output.
For the six UPRISE uprates, DOE has published an aggregate planned capacity but not the individual contributions by plant. The available announcements also do not establish named project contractors or suppliers. Those details require confirmation in plant filings or company announcements rather than inference from ownership or general industry capabilities.
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