KEPCO's involvement in the nuclear energy sector ranges from design and engineering of the nuclear power plant to nuclear fuel, commissioning and operation, maintenance and decommissioning. Construction of KEPCO nuclear power plants is undertaken by major Korean construction companies, while the manufacture of key elements of a nuclear power plant is done by companies including Doosan Heavy Industries & Construction and Westinghouse Electric Company. In 2009, KEPCO won a bid to construct four units of the APR-1400 reactor in the United Arab Emirates at Barakah.