The first hydropower plant was built in 1904 by a local entrepreneur. It was located in a small town outside of Reykjavík and produced 9 kW of power. The first municipal hydroelectric plant was built in 1921, and it could produce 1 MW of power. This plant single-handedly quadrupled the amount of electricity in the country. The 1950s marked the next evolution in hydroelectric plants. Two plants were built on the Sog River, one in 1953 which produced 31 MW, and the other in 1959 which produced 26.4 MW. These two plants were the first built for industrial purposes and they were co-owned by the Icelandic government. This process continued in 1965 when the national power company, Landsvirkjun, was founded. It was owned by both the Icelandic government and the municipality of Reykjavík. In 1969, they built a 210 MW plant on the Þjórsá River that would supply the southeastern area of Iceland with electricity and run an aluminum smelting plant that could produce 33,000 tons of aluminum a year.