Palo Verde Nuclear Generating Generation Units 1, 2 and 3 are located in Wintersburg, Arizona approximately 50 miles west of Phoenix, Arizona. The Combustion Engineering PWRs are operated and owned (29.1%) by Arizona Public Service Company, a wholly owned subsidiary of Pinnacle West Capital Corp. The remaining owners of Palo Verde are: Salt River Project (17.5%); El Paso Electric Co. (15.8%); Southern California Edison Company (15.8%), a wholly owned subsidiary of Edison International; Public Service Co. of New Mexico (10.2%), a wholly owned subsidiary of PNM Resources, Inc.; Southern California Public Power Authority (5.9%); and Los Angeles Department of Water & Power (5.7%). Unit 1 is licensed to operate until June 1, 2045. Unit 2 is licensed to operate until April 24, 2046. Unit 3 is licensed to operate until November 25, 2047.
The ISFSI began accepting SNF from Unit 2 in March 2003, from Unit 1 in July 2003, and from Unit 3 in January 2004 pursuant to a general license. The ISFSI is located outside the security perimeter for the plant approximately 1,500 feet southeast of the reactor building for Unit 3; however, it has its own security fences. The ISFSI consists of 12 concrete storage pads each capable of holding 28 casks. As of early March 2012, there were 2,256 SNF assemblies stored in 94 dry casks (the upper photo only shows 53 casks and the lower photo only shows 47 casks). The cask manufacturer is NAC International — the NAC-UMS cask system and the UMS-24 canister type. As of the end of 2010, there was 2,070 metric tons of SNF stored at Palo Verde.