# 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

.0625                              0.51                 0.51                   0.45                        0.56

Air-to-Air Heat Pump 200% Efficient

.0625                             0.76                 0.77                    0.68                      0.84

Electric Resistance 100% Efficient

.0625                              1.53                1.54                    1.37                      1.68

 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