AECL issued the development deal in 1969 for the first BHWP device (BHWP A). Commissioning of BHWP A was completed by Ontario Hydro from 1971 via 1973, Together with the plant coming into company on 28 June 1973, and structure generation potential currently being reached in April 1974. Due to success of BHWP A and the large volume of large drinking