San Onofre 1, 2 & 3

Basic Facts:

  • Location: San Clemente, California
  • Owner: Southern Californian Edison (majority owner)
  • Operator: Southern California Edison
  • Total Construction Cost: $12B (2018$)
  • Total Plant Output: 2,700 MW
  • Property Size: 84 acres
  • Status: Decommissioning
  • Current DTF Balance: $2.0 (2018$)
  • Decommissioning Cost Estimate: $2.0 (2018$)
  • Spent Nuclear Fuel on Site: 1,609 metric tons
San Onofre 1, 2 & 3 Photo


Facility construction began in 1964. Unit 1 was a pressurized water reactor that operated from 1968 to 1992. It has since been dismantled. Units 2 and 3 were commissioned in 1983 and 1984 respectively and were shut down in 2012 due to premature wear within the steam generators. In 2013, the plant owners announced the permanent retirement of both units.


In 2016, plant owners announced it had selected a joint venture of AECOM and Energy Solutions as the plant’s decommissioning general contractor. The decommissioning process is expected to be complete in the 2050 timeframe. Additional decommissioning information is available at the San Onofre Decommissioning Website.


San Onofre is located in Orange County, California. As of 2016:

  • Population: 3,200,000
  • Per Capita Annual Income: $62,000
  • Unemployment rate (not seasonally adjusted): 3.5%

The San Onofre nuclear facility decommissioning effort is forecast to generate an estimated $4.1B of economic output for the state of California, with the single greatest impact of $1.2B in Orange County.

Contact Information

Economic Development Administration Representative:

  • Wilfered Marshall, Los Angeles Regional Office, t: (310) 348-5386, e: [email protected]

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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