TransAlta Corp. engages in the generation and distribution of electricity through wind, hydro, gas and coal power plants. It operates through the following business segments: Canadian Coal, U.S. Coal, Canadian Gas, Australian Gas, Wind & Solar, Hydro, Energy Marketing and Corporate. The Canadian Coal, U.S. Coal, Canadian Gas, Australian Gas, Wind and Solar, and Hydro segments are responsible for constructing, operating and maintaining its electrical generation. The Energy Marketing segment engages in marketing its production through short-term and long-term contracts. The Corporate segment deals with its central financial, legal, administrative, and investing functions. The company was founded by William Maxwell Aitken in 1909 and is headquartered in Calgary, Canada.