As a world leading power company, InterGen was established in 1995, headquartered in Boston, Massachusetts, USA. InterGen is mainly engaged in development and operation of power plants. At present, InterGen owns 11 power plants, 2 compressor stations and gas pipelines, distributed in three countries, namely the UK, Mexico and Australia. There are 8 gas-fired power stations, 2 coal-fired power plants and 1 wind mill, with total installed capacity of 6,798MW and net equity capacity of 5,163MW.
On April 11, 2011, China Huaneng Group and Guangdong Yudean Group Co., Ltd. announced that Overseas International Industrial Co., Ltd (the joint venture of the two companies) successfully acquired 50% stake of InterGen from India-based GMR Group with a bid of USD 1.232 billion.