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Intermountain Gas Company
RS-1 Residential Cost Comparison
Space Heat Only

The following cost comparisons for Natural Gas space heating vs. electric are based on 565 therms per year consumed by the average Intermountain Gas Company residential customer using natural gas for space heating.

All Prices Approved 10/01/09
Energy Source Efficiency Annual Energy Cost Monthly Energy Cost Savings
With Gas
IGC Natural Gas Space Heat 82% $536.76 $44.73
Idaho Power Space Heat 100% $1,103.32 $91.94

51%
City of Idaho Falls Space Heat 100% $726.93 $60.58

26%
Rocky Mountain Power Space Heat 100% $1,136.82 $94.74

53%
Oil Space Heat @ $2.22/Gal 80% $918.47 $76.54

42%
Propane Space Heat @ $2.07/Gal 82% $1,277.57 $106.46

58%

Intermountain Gas Company
RS-2 Residential Cost Comparison
Space Heat and Water Heat

The following cost comparisons for Natural Gas space and water heating vs. electric are based on 808 therms per year consumed by the average IGC residential customer using natural gas for both space and water heating.

Energy Source Efficiency Annual Energy Cost Monthly Energy Cost Savings
With Gas
IGC Natural Gas Space Heat 82%
IGC Natural Gas Water Heat 62%
Total $682.93 $56.91
Idaho Power Space Heat 100%
Idaho Power Water Heat 90%
Total $1,447.60 $120.63

53%
City of Idaho Falls Space Heat 100%
City of Idaho Falls Water Heat 90%
Total $989.78 $82.48

31%
Rocky Mountain Power Space Heat 100%
Rocky Mountain Power Water Heat 90%
Total $1,588.84 $132.40

57%
Oil Space Heat @ $2.22/Gal 80%
Oil Water Heat 59%
Total $1,322.74 $110.23

48%
Propane Space Heat @ $2.07/Gal 82%
Propane Water Heat 62%
Total $1,826.23 $152.19

63%
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