Русско-англо-русский юридический словарь

A power station, also referred to as a power plant or powerhouse and sometimes generating station or generating plant, is an industrial facility for the generation of electric power. (Wikipedia)

A power plant or power station both describes the facility for the generation of electricity. Thus, there is no difference between both the terms and can be used interchangeably. In America, people prefer to use the term power plant, while elsewhere any term can be used. A ‘power plant’ may also be used to refer to the engines in vehicles like aircrafts and ships. (Quora)