Measurements, abbreviations, and acronyms used in this subpart and subparts BB through II are defined as follows:
    
    Btu—British thermal unit.
    
        
            Code of Federal Regulations
        
        CO2—carbon dioxide
    
    
        
            Code of Federal Regulations
        
        H2O—water
    
    Hg—mercury
    hr—hour
    kW—kilowatt electrical
    kWh—kilowatt hour
    lb—pound
    mmBtu—million Btu
    MWe—megawatt electrical
    MWh—megawatt hour
    
        
            Code of Federal Regulations
        
        NOX—nitrogen oxides
    
    O2—oxygen
    ppm—parts per million
    scfh—standard cubic feet per hour
    
        
            Code of Federal Regulations
        
        SO2—sulfur dioxide
    
    yr—year
    
        
            Code of Federal Regulations
        
        [71 FR 25381, Apr. 28, 2006]