Since its founding in 1995, InterGen has had a successful track record of developing, constructing, and operating power projects around the world.
- International Generating Company “InterGen” was officially incorporated on March 20, 1995 when Bechtel and Pacific Gas & Electric (PG&E) jointly purchased J. Makowski Company, one of the first independent power producers when power generation was deregulated in the US.
- In 1997, Shell Generating Ltd. acquired PG&E’s stake in InterGen. The partnership between Shell and Bechtel enabled InterGen to become one of the world’s fastest-growing developers of greenfield energy projects.
- In 1998, under Carlos Riva’s leadership as InterGen’s first president and CEO, the first InterGen power plant was built in Runcorn, England.
- InterGen has developed, financed, constructed, and operated a portfolio of more than 20 power plants, pipelines, compression stations and other energy-related infrastructure assets in more than 15 countries and six continents with a combined generating capacity of greater than 18 gigawatts.
- In 2005, InterGen was sold to Ontario Teachers’ Pension Plan and AIG Highstar.
- GMR acquired AIG Highstar's 50 percent stake in InterGen in 2009.
- In 2011, China Huaneng Group and Guandong Yudean Group purchased GMR's 50 percent stake in InterGen.
- InterGen closed a $1.8 billion refinancing of its corporate debt facilities in 2013.
- In 2015, InterGen embarked on its first renewable energy project through an investment with IEnova in the Energía Sierra Juárez wind farm in Tecate, Baja California, Mexico; the first cross-border renewable energy facility between Mexico and the US.
- On August 3, 2015, InterGen's San Luis de la Paz power plant began commercial operations near the municipality of San Luis de la Paz, Guanajuato, Mexico. The 205 megawatt (MW) combined-cycle natural gas power project was built adjacent to InterGen's Bajio power plant.
In February 2018, InterGen closed on the financing for its new Welland Power Station in Spalding, Lincolnshire (UK), a 300-megawatt open-cycle gas turbine project.