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Nuclear Power Uprating

  • [ GWh of Electricity Added: ]

  • [ Jobs Impact: ]

    • Low
    • Medium
    • High
  • [ Budget Impact:]

    • Low
    • Medium
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  • [ Conventional Pollutants Reduced: ]

    7,575 tons
    6,253 tons
    .102 tons
    1,161 tons
  • [ Megatons of GHG Reduced: ]



With the promise of the “nuclear renaissance” in the U.S. slowed by high capital costs, cheap natural gas, and low demand growth for electricity some focus has shifted from building new reactors to making our existing nuclear fleet more efficient.1 Already nuclear uprates have increased the average capacity of U.S. nuclear plants and created 6 GW at existing installations.2 New federal policies could further add more than 7 GW of new generation capacity to the grid.3 That is roughly the equivalent of 7 large reactors coming online4 and could be called the “hidden nuclear renaissance.”


Reactors at nuclear power plants create electricity by producing heat that turns water into steam, turning turbines that generate electricity. Many reactors generate less heat– therefore less electricity– than they are safely capable of producing. Increasing generation through higher heat is called “uprating.”5 Yet industry is currently struggling to undertake certain uprating projects. Low natural gas prices create less interest in nuclear generation, especially in competitive electricity markets.6 Also, finding certain efficiencies may require modeling and simulation capabilities that are available only at U.S. national labs.7 While individual utilities are responsible for uprates, a joint industry-government effort to provide low-interest capital and access to government expertise could dramatically increase the electricity generated from uprates.

Adding another GW of nuclear energy to the grid could create enough electricity to power at least 5.25 million homes.8 That is more homes than in the state of Ohio.9 Assuming the uprates replaced coal, 7 GW of uprates would eliminate as much as 52 megatons of greenhouse gas emissions.10 And nuclear produces no conventional pollutants so uprating could remove as much nitrogen and sulfur oxides, mercury, and particulate matter as produced by about 23 average-size coal plants every year.11


Uprates both create thousands of jobs while at the same time providing low-cost electricity competitive with the price of coal. Providing industry with access to the technical capabilities of our national lab and research infrastructure and creating a low-interest loan program, could result in significant increases in uprating projects.

Fund the Nuclear Modeling and Simulation Hub

Adding significant new capacity through uprating can require sophisticated simulations and data that only government labs can provide. Congress should enable the completion of the Nuclear Modeling and Simulation Hub, already in progress at Oak Ridge National Laboratory.12 Scientists at Oak Ridge are using its Jaguar and Kraken super computers and other capabilities to calculate optimal operations for future uprating.13 The low cost of the nuclear modeling project makes it an extraordinarily good deal for the identification of substantial plant efficiencies. If the lessons from this project are applied across the nuclear fleet, it could result in a 5-7 GW increase in nuclear capacity.14

Provide Low Interest Loans for Uprates

Uprates often require a large amount of project financing, though far less than the construction of a new plant.15 The financial risks for operating plants with proven track records and existing customers are often outweighed by the need of utilities to find access to cheap sources of electric generation.16 Yet utilities operating in competitive markets and those in regulated markets alike are cautious about undertaking uprating projects while nuclear generation remains at a disadvantage to natural gas.17 To incentivize uprating, the federal government should make low-interest loans available to utilities seeking to implement uprate projects. The risk to the government of default on those loans would be small. And once the uprates are operational, utilities would service this debt with revenues from total power sales to customers.

Extend the Nuclear Production Tax Credit

The 2005 Energy Policy Act authorized a production tax credit for new nuclear plants put in service before 2020.18 Congress should extend the tax credit to capacity additions from nuclear uprating projects of existing plants, and it should extend tax credit eligibility until all remaining credits are claimed. Although the original credit allowed 6 GW of new capacity, but since few new plants are under construction or on the books, only 4.4 GW of new capacity will currently be able to use it.19 This change would make existing plants more efficient and could help to avoid future uprating cancellation. In 2013, this happened five times — and the U.S. only has about a hundred reactors.20

  1. The Energy Information Administration has detailed the potential to increase U.S. nuclear capacity via uprating. See United States, Department of Energy, Energy Information Administration, “Uprates Can Increase U.S. Nuclear Capacity Substantially Without Building New Reactors,” July 17, 2012. Accessed April 4, 2013. Available at:
  2. United States, Nuclear Regulatory Commission, “Power Uprates for Nuclear Plants,” February 4, 2011. Accessed April 4, 2013. Available at:
  3. Based on goals provided by the Consortium for Advanced Simulation of Light Water Reactors and possible uprates enabled by low-interest financing. See United States, Department of Energy, Office of Nuclear Energy, “CASL: The Consortium for Advanced Simulation of Light Water Reactors,” Presentation, p.11, August 1, 2011. Accessed April 4, 2013. Available at:
  4. Calculations based on deployment of seven AP 1000 reactors with a nameplate capacity of 1117 MW. See Westinghouse, “AP1000: Simple, Safe, Innovative,” Report, 2007, p. 3. Accessed April 2, 2013. Available at:
  5. Definition of uprating from NRC. See “Power Uprates for Nuclear Plants.”
  6. See “UPDATE2-Exelon Cuts Nuclear Upgrade Spending Amid Low Gas Prices,” Reuters, February 7, 2013. Accessed April 4, 2013. Available at:
  7. Consortium for Advanced Simulation of Light Water Reactors, “CASL: A Project Summary,” Report, July 18, 2011, p. 9. Accessed April 4, 2013. Available at:
  8. According to the Electric Power Supply Association, 1 MW of electricity is enough to power 750–1,000 homes. As such, 7 GW can power between 5.25 million and 7 million homes. See Electric Power Supply Association (EPSA), “Electricity Primer: The Basics of Power and Wholesale Markets,” Accessed May 14, 2012. Available at:
  9. Housing unit figures based on 2010 census data. See United States, Department of Commerce, U.S. Census Bureau, “State & County QuickFacts.” Accessed May 14, 2012. Available at:
  10. Calculations based on data from the Energy Information Administration on capacity factor of energy, and peer reviewed analysis of GHG output by energy source. See United States, Department of Energy, Energy Information Administration, “Levelized Cost of New Generation Resources in the Annual Energy Outlook 2012,” Report, Table 1, July 12, 2012.Accessed March 4, 2013. Available at:; See also, Benjamin Sovacool, “Valuing Greenhouse Gas Emissions from Nuclear Power: A Critical Survey,” Energy Policy, June 2, 2008, p. 2950, Print.
  11. Analysis based on conventional pollutants of a 550 MW subcritical bituminous pulverized coal plant, assumed to be average sized for the PowerBook. See United States, Department of Energy, National Energy Technology Laboratory, “Subcritical Pulverized Bituminous Coal Plant,” Report. Accessed March 4, 2013. Available at:
  12. A more detailed description of the Modeling and Simulation hub is available at the Consortium for Advanced Simulation of Light Water Reactors website:
  13. Ibid.
  14. According to both researchers and industry, the benefits on modeling and simulation could be massive and potential increases in capacity could rise to as many as 20 GW. See Nuclear Energy Institute, “Release the Kraken: Energy Hubs and Simulation,” NEI Nuclear Notes, June 4, 2010. Print; See also “CASL: The Consortium for Advanced Simulation of Light Water Reactors.”
  15. For example, the Turkey Point plant in Florida is spending $766 million for its uprate project. This is expected to yield a 14% increase in power production, or 100MW in capacity. See “Turkey Point Brings 5,000 Construction Jobs, Business to South Florida,” Nuclear Street, November 23, 2011. Accessed April 4, 2013. Available at:
  16. “The economic incentives for low-cost electricity will continue to drive more and more utilities to identify safe and reliable methods of increasing the electrical power output of a nuclear power plant. Power uprate provides such a method for many operating NPPs.” “Power uprate in Nuclear Plants: Guidelines and Experience,” Report, International Atomic Energy Agency, 2011, p. 31. Accessed April 4, 2013. Available at:
  17. Recent cost and scheduling overruns have added to the challenge presented by natural gas. See Dan O’Loughlin, “A Strategic Approach to Improved EPU Implementation,” Nuclear News, February, 2013, p. 33. Accessed April 4, 2013. Available at:,d.dmg.
  18. United States, Congress, House of Representatives, Committee on Ways and Means, “Statement for the Record for the Energy Tax Reform Working Group,” Statement by the Nuclear Energy Institute, 113th Congress, 1st Session, April 15, 2013, p. 3. Accessed April 4, 2014. Available at:
  19. Ibid, p. 3.
  20. Cancelled upratings include: Prairie Island in Minnesota, two reactors at LaSalle in Illinois, and two reactors at Limerick in Pennsylvania. See Mark Cooper, “Cooper: Entergy Surrender On Vermont Yankee Reactor Is Latest Evidence Of "Rapid-Fire Downsizing" Of Nuclear Power In U.S.”, PR Newswire, August 27, 2013. Accessed September 23, 2014. Available at: