Comparison of nine conservation supply curves for electricity shows that fully implementing a series of energy efficiency measures will result in annual saving of 734 billion kWh (BkWh). This is 45 percent of 1989 U.S. building sector electricity use of 1627 BkWh and represents a $29 billion saving. When translated to units of conserved carbon dioxide (CC CO 2 ), this annual saving is 514 megatonnes, which is 10 percent of the total 1989 U.S. carbon dioxide (CO 2 ) emissions from all sources. Implementing additional fuel efficiency measures would result in further potential saving of 5·2 quads of fuel (natural gas and oil) per year, or another 300 megatonnes of CO 2 , at a net savings of $20 billion. Fuel switching (replacing electric resistance heat with on-site natural gas combustion) would produce annual saving of another 74 megatonnes of CO 2 at a net saving of $6·8 billion. Thus, total CO 2 saving from these combined efficiency measures are 890 megatonnes at a net saving of $56 billion per year. Copyright 1993 Western Economic Association International.
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