Korea Electric Power Corporation (NYSE: KEP, KRX: 015760), better known as KEPCO (Hangul: 켑코), is the largest electric utility in South Korea, responsible for the generation, transmission and distribution of electricity and the development of electric power projects including those in nuclear power, wind power and coal. KEPCO is responsible for 93% of Korea's electricity generation. The South Korean government (directly and indirectly) owns a 51.11% share of KEPCO. Together with its affiliates and subsidiaries, KEPCO has an installed capacity of 65,383 MW. On the 2011 Fortune Global 500 ranking of the world's largest companies, KEPCO was ranked 271. KEPCO is a member of the World Energy Council, the World Nuclear Association and the World Association of Nuclear Operators. As of August 2011, KEPCO possesses an A+ credit rating with Fitch Ratings, while Moody's has assigned KEPCO an A1 stable rating.

Currently located in Samseong-dong, Seoul, KEPCO headquarters is scheduled to relocate to the city of Naju in South Jeolla Province in August 2014 as part of a government decentralization program. The move, which has been in the works for years has been controversial Hwan-Ik Cho is the president and CEO of KEPCO.

KEPCO traces its origins to Hanseong Jeongi Hoesa (Seoul Electric Company), founded in 1898 during the Joseon Dynasty. The announcement of the Chosun Electricity Control Decree by the Colonial Korean government in March 1943 saw the integration of several electric companies into the Korea Electric Power Company. The Korea Electric Company (KECO), established through the integration of the Korea Electric Power Company and two distribution companies, Gyeongsung Electric Company and South Korea Electric Company, opened on July 1, 1961. In 1982, KECO became a wholly government owned entity and was renamed the Korea Electric Power Corporation (KEPCO).

KEPCO was listed on the Korea Composite Stock Price Index (KOSPI) on August 10, 1989 and later in 1994 on the New York Stock Exchange. In 1996, KEPCO was named the prime contractor for the multinational Korean Peninsula Energy Development Organization (KEDO) project to construct a light water reactor nuclear power plant in North Korea, a project which was eventually abandoned in 2006. Following a push by the Korean government to restructure Korea's power industry which began in the mid-1990s, the Act on the Promotion of Restructuring the Electric Power Industry was proclaimed on December 23, 2000, after which the electricity generation business was split up into Korea Hydro & Nuclear Power, a subsidiary responsible for nuclear & hydro power generation, and five thermal power generation companies: Korea South-East Power, Korea Midland Power, Korea Western Power, Korea Southern Power, and Korea East-West Power.

In October 2012, Korea Deposit Insurance Corporation sold its 3.6% of its stake in KEPCO for a fee of around $550 million.

KEPCO comprises six power generation companies and four subsidiaries in related business areas. It also owns a stake in four affiliated companies.

In Korea, KEPCO primarily provides electricity to include industrial, commercial, residential, educational and agricultural customers. As of December 31, 2011, KEPCO had a total installed generating capacity of 67,001MW produced by 503 generation units including nuclear, oil, coal, liquified natural gas, hydro, wind and solar sources. The length of KEPCO's transmission lines stood at 31,249 circuit kilometers as of end-2011.

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.

In October 2013 a vice-president of KEPCO, amongst about 100 people, was indicted for falsifying safety documents.

In 2017 KEPCO showed interest in taking a stake in the Moorside Nuclear Power Station in the UK.

KEPCO's overseas forays started in 1993 when the company was awarded a technical consulting contract for maintenance on the Guangdong nuclear power plant in China. At present, KEPCO is involved in projects in 13 countries around the world. In 1996, KEPCO entered the Philippines power market when it was awarded the contract for the refurbishment and operation of the Malaya thermal power plant. In 1996, KEPCO won the bid to construct the Ilijan gas-fired combined cycle power plant, a 1,200MW build-operate-transfer project. Today, KEPCO operates four power plants in the Philippines, including the Naga Power Plant Complex and the Cebu Circulating Fluidized Bed Combustion Power Plant, while the company's operations account for 12% of the country's installed generation capacity. In April 2012 KEPCO contracted ICPO to raise $400m to buy into Boutique Coal in Australia to benefit from cheap coal briquettes which improved burn efficiency by up to 30% reduced SO
x and NO
x by >80% and reduced CO
2. KEPCO scientists tried to get IP details and reverse engineer the product for their own use. BC cancelled all association with KEPCO due to an attempt to circumvent and declared KEPCO less than reputable.

In the area of transmission and distribution consultation, KEPCO has undertaken projects in Myanmar, Cambodia, Vietnam, Indonesia, Libya, Ukraine, Paraguay and Egypt. KEPCO entered the wind power industry in China with its involvement in the Gansu wind project, on which the first stage of construction began in 2007. KEPCO also holds an equity share in wind projects in Inner Mongolia and Riaoning, as well as in China's Shanxi Province. In 2010, a KEPCO-led consortium including Samsung C&T and Korean firm Techint was awarded a contract to build and operate the Norte II combined cycle gas power plant in the Mexican state of Chihuahua. In 2005, KEPCO began supplying electricity to the Kaesong Industrial Region in North Korea.

In order to raise its fuel self-sufficiency rate to 60% by 2020, in 2010, KEPCO acquired the Bylong Coal Mine in Australia from Anglo American PLC. Also in 2010, KEPCO bought a 20% stake in Bayan Resources in Indonesia, thus allowing the company to raise its coal self-sufficiency rate by 7 million tons annually from 2015. In 2009, KEPCO bought a 1.5% stake in Indonesia's Adaro Energy, thus securing 3 million tons of coal annually. Regarding uranium procurement, in 2009, KEPCO acquired a 17% share of Denison Mines Corp. in Canada, as well as a 10% stake in Areva SA's Imouraren uranium mine in Niger. In 2010, KEPCO signed an agreement with Areva to jointly develop uranium mines.

In early 2010, KEPCO announced it would invest over US$7 billion in its smart grid business by 2030 to make electricity distribution more efficient and decrease Korea's greenhouse gas emissions. KEPCO is one of the 168 Korean and foreign companies taking part in the Jeju Smart Grid Demonstration Project, begun following the announcement of Korea's National Smart Grid Roadmap in 2009. In June 2011, it was announced that KEPCO would collaborate with IBM to build a Total Operations Center at the Jeju Smart Grid Test-Bed Demonstration Complex.