This trend continued and increases in the production of hydroelectric power are directly related to industrial development. In 2005, Landsvirkjun produced 7,143 GWh of electricity total of which 6,676 GWh or 93% was produced via hydroelectric power plants. 5,193 GWh or 72% was used for power-intensive industries like aluminum smelting. In 2009 Iceland built its biggest hydroelectric project to date, the Kárahnjúkar Hydropower Plant, a 690 MW hydroelectric plant to provide energy for another aluminum smelter. This project was opposed strongly by environmentalists.