btu = ft-lbf
btu = kWh
btu = quad
btu = calorie
btu = Joule, J or N*m
kWh = Joule, J or N*m
calorie = hp-hr
calorie = Joule, J, N*m
GigaJoule, GJ = MegaWatt Hour, MWh
Million BTU, MMBtu = MWh