Terawatts to BTU (IT) per second converter on this page calculates how many BTU (IT) per second are in 'X' terawatts (where 'X' is the number of terawatts to convert to BTU (IT) per second). In order to convert a value from terawatts to BTU (IT) per second (from TW to BTU/s) type the number of TW to be converted to BTU/s and then click on the 'convert' button.