Rancho Seco

Basic Facts:

  • Location: Herald, California
  • Owner: Sacramento Municipal Utility District
  • Construction Cost: $1.9B (2018$)
  • Plant Output: 900 MW
  • Property Size: 2,500 acres
  • Status: Decommissioned
  • Current DTF Balance: $8M (2018$)
  • Decommissioning Completion Estimate: $6M (2018$)
  • Spent Nuclear Fuel On Site: 228 metric tons
Rancho Seco Photo


Rancho Seco was commissioned in 1975 and operated its one pressurized water reactor until 1989 when the plant was closed by public vote.


Rancho Seco has been undergoing decommissioning since 1997. All nuclear power related equipment has been removed from the site and in 2009, the NRC released the majority of the plant site for unrestricted use. In 2018, the NRC officially terminated the plant’s license. Site redevelopment has included a 500 MW natural gas plant and approximately 100 MW of solar power.


Rancho Seco is located within Sacrament County, California. As of 2016:

  • Population: 1,500,000
  • Per Capita Annual Income: $48,100
  • Unemployment rate (not seasonally adjusted): 4.6%

Contact Information

Economic Development Administration Representative:

University Center

Nuclear Regulatory Commission

Unless specific costing information has been provided, decommissioning costs were derived from 2017 Decommissioning Funding Status Report.
Information herein obtained from public sources. Corrections are welcome and may be directed to [email protected].

(802) 345-7044




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