Ringhals consists of four reactors and is one of few nuclear power plants to have both boiling water and pressurised water reactors.
The first reactor (R1) is a boiling water reactor, built by Asea-Atom, and has an installed electrical capacity of 881 MW. It began operating commercially in January 1976.
The three remaining reactors (R2, R3 and R4) are pressurised water reactors manufactured by Westinghouse. R2 has an installed electrical capacity of 865 MW and went commercial in May 1975. R3 has an installed electrical capacity of 1,063 MW and began commercial operation in September 1981 and R4 – with an installed electrical capacity of 1,123 MW – went commercial in November 1983.
The history of Ringhals dates back to 1965, when Vattenfall began buying land in the Väröhalvön peninsula area. Requests for tender regarding a boiling water reactor and a pressurised water reactor were issued in the following years. In 1968, the construction and operation of a nuclear power plant were approved by His Majesty the King, and one reactor of each kind was purchased from Asea-Atom and Westinghouse, the selected suppliers. In 1970 construction began at Ringhals and in 1972 the site was one of the largest workplaces in Europe, employing about 3,200 people. Commercial operation of Ringhals started with the second reactor in 1975 and in the following years the other reactors were connected to the grid.
In 1998 Ringhals reached a milestone, having generated 400 TWh of electricity, which at the time amounted to 10% of all electricity consumed in Sweden since the introduction of the light bulb at the beginning of the century. In 2004 Ringhals reached an all-time-high in electricity generation, supplying 28 TWh of electricity to Sweden.