Folsom State Prison (FSP) is a California State Prison in Folsom, California, U.S., approximately 20 mi northeast of the state capital of Sacramento. It is one of 33 prisons operated by the California Department of Corrections and Rehabilitation. Opened 137 years ago in 1880, Folsom is the state's second-oldest prison, after San Quentin, and the first in the United States to have electricity.