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Calculating how to replace all coal in electricity generation

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Source: EIA, Net Generation by Energy Source by Type of Producer, 1995 through 2006

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Electricity energy source, 2006Thousand Megawatt hours% of 2006

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Coal1,990,92648.98%

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Petroleum64,3641.58%

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Natural Gas813,04420.00%

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Other Gases16,0600.40%

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Nuclear787,21919.37%

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Hydroelectric289,2467.12%

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Other Renewable96,4232.37%

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Hydro pumped storage-6,558-0.16%

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Other13,9770.34%

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Total4,064,702100.00%

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% of electricity used for space and water heating and cooling30%

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# thousand megawatt hours not needed by coal if heating and cooling all done by geothermal exchange1,219,411"=B17*B15"

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Above, expressed as % of coal61%"=B18/B6"

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% of natural gas used for space and water heating and cooling32%

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% of natural gas used to generate 20% of electricity29%

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# thousand megawatt hours that could be used for replacing coal if natural gas not used for heating/cooling905,268"=(B21/B22)*B8"

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Above, expressed as % of coal45%"=B23/B6"

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Therefore, all coal could be replaced by building-provided power plus the natural gas that wouldn't be needed anymore for heating/cooling.

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Now, what about electricity for ground-source heat pump units?

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annual kwhrs for 2000 sq ft3,300

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number of households in US100,000,000

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total kwhrs for residences330,000,000,000

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kwhrs per day provided by PV9.04