TransAlta Corporation operates as a non-regulated electricity generation and energy marketing company in Canada, the United States, and Australia. The company engages in the generation and wholesale trade of electricity and other energy-related commodities and derivatives. It owns, operates, and manages a portfolio of assets and utilize a range of generation fuels, including coal, natural gas, hydro, wind, and geothermal. As of December 31, 2012, it had a net ownership interest of 7,858 megawatts of generating capacity in operation. TransAlta Corporation has a strategic partnership with MidAmerican Energy Holdings Company to develop, build, and operate new natural gas-fired electricity generation projects in Canada. The company was founded in 1909 and is headquartered in Calgary, Canada.