High Quality Content by WIKIPEDIA articles! Switzerland has four nuclear power plants, with five reactors in operation as of 2008. These plants produced 26.3 TWh in 2007 (up 19.5% from 2005, when 22.0 TWh were produced). Nuclear power accounts for 39.9% of the total production of electricity (65.9 TWh) in the country; the rest was produced by hydroelectric plants (55.2%) and conventional thermal or other plants (4.9%).