Measurements, abbreviations, and acronyms used in this part are defined as follows:
Btu - British thermal unit.
hr - hour.
Kwh - kilowatt hour.
lb - pounds.
mmBtu - million Btu.
MWe - megawatt electrical.
ton - 2000 pounds.
CO2 - carbon dioxide.
NOX - nitrogen oxides.
O2 - oxygen.