Example:
15 GW = 20115331.343925 horsepower (550 ft·lbf/s)
1 GW = 1341022.089595 horsepower (550 ft·lbf/s) | 1 horsepower (550 ft·lbf/s) = 7.456999e-7 GW
Conversion Steps:
15 × (1e+9 / 745.699871582) = 20115331.343924616