Terawatts to horsepower (metric) conversion calculator above calculates how many horsepower (metric) are in 'X' terawatts (where 'X' is the number of terawatts to convert to horsepower (metric)). In order to convert a value from terawatts to horsepower (metric) (from TW to hp) just type the number of TW to be converted to hp and then click on the 'convert' button.