OKG AB (Oskarshamns Kraftgrupp AB) is a Swedish corporation who owns and operates the Oskarshamn Nuclear Power Plant. It is majority owned by Sydkraft.
The three reactors, Oskarshamn 1–3, manufactured by ASEA Atom, were put into operation in 1972, 1974, and 1985, respectively. At the reactor site, some 30 km north of Oskarshamn, OKG used to operate CLAB – Sweden's central interim storage facility for radioactive waste. From 2006-10-01, however, CLAB was transferred to SKB (Svensk Kärnbränslehantering AB or Swedish Nuclear Fuel and Waste Management Co).