The Petaluma and Santa Rosa Railway Power House is a historic building in Sebastopol, California, U.S., built to serve the Petaluma and Santa Rosa Railroad, an electric interurban railway of Sonoma County. It is also known as the Hogan Building and the P&SR Substation. The Petaluma and Santa Rosa Railway Power House is located on Petaluma Avenue in Sebastopol, adjacent to the P&SR Depot on South Main Street. The building has been listed on the National Register of Historic Places.