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Energy Costs

Comparing Energy Costs

 
   Electricity                 Fuel Oil           Propane           Natural Gas        Natural Gas
Water/Air HP              Regular            Regular               Regular         Super Efficient
   (COP 3)                  (60% Eff.)      (92% Eff.)          (75% Eff.)           (92%) Eff.)
(Cents/kWh)                ($/gal.)            ($/gal.)               ($/therm.)              ($/therm.)
 
Geothermal or Ground-Source heat Pump 300% Efficient
 
   .06                              0.49                 0.49                   0.44                        0.54
 
 Air-to-Air Heat Pump 200% Efficient
 
    .06                             0.73                 0.74                     0.66                      0.80
 
Electric Resistance 100% Efficient
 
    .06                              1.47                 1.48                     1.32                      1.62
                                                                                               
             
 

Fuel Btu Heat Content Annual Season Operating Efficency
Electricity  3,413  Btu/kWh    100%, 200%, 300%
#2 Fuel Oil   140,000  Btu/gallon 60%
Propane  91,600 Btu/gallon 92%
Natural Gas 100,000 Btu/thermal  75%, 92%
Wood   16,000,000 Btu/ton  60%


Formulas:
Alternate fuel price to electric rate conversion formula:
            (Fuel Price) / (Fuel Eff.) x (3413 x Elec. Eff.) / (BTU Content) = Electric Rate
           
            Example of $1.48/gallon propane to electricity with a super-efficient furnace:
                        (1.48) / (0.9) x (3413x100) / (91,600) = 6 cents per kWh
 
Electricity rate to alternate fuel price conversion formula:
            (Electric Rate) x (Fuel Eff.) x (Btu Content)  /(3413xElec. Eff.) = Fuel Price
 
            Example of 6.4 cents/kWh Electric Rate to #2 Fuel Oil with a regular furnace:
                        (6) x (0.6) x (140,000) / (3413x100) = $1.47 per gallon

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