 Also referred to as the TransAlta Centralia Mining (TCM) operation, the coal mine is located approximately northeast of the city of Centralia, in Lewis County, in the US state of Washington.Together with Centralia Power Plant, it was bought in May 2000 by TransAlta for $554 million – $101 million for the mine and $453 million for the power plant.The Centralia Coal Mine was Washington state's largest coal mine.