Table 1. Proportion of cumulative energy produced from 2012 to 2040 in the United States for four scenarios.

Energy Product	Energy Source		Reference	Low cost renewable	High resource	GHG Tax
Electricity	Nuclear		12.4%	12.4%	11.6%	13.5%
	Coal		32.9%	32.5%	27.0%	29.2%
	Natural Gas	Shale Gas	22.9%	22.7%	27.1%	23.5%
		Tight Gas	11.8%	11.8%	14.3%	12.3%
		Coalbed Methane	3.1%	3.1%	2.7%	3.3%
	Renewables	Conventional	9.2%	9.2%	10.6%	9.7%
		Wind	2.6%	3.0%	2.3%	3.1%
		Geothermal	0.5%	0.5%	0.4%	0.6%
		Solar Photovoltaic	0.3%	0.5%	0.2%	0.5%
		Hydropower	4.1%	4.2%	3.9%	4.4%
		Solar Thermal	0.038%	0.038%	0.036%	0.040%
		Biomass	0.004%	0.011%	0.001%	0.005%
		Total Kwhrs	204,917	204,806	216,603	195,351
Liquid Fuel	Oil	Tight Oil	47%	46%	62%	47%
		Conventional	45%	44%	33%	45%
	Biofuels		9%	10%	5%	9%
		Total Kwhrs	28,597	29,180	42,851	28,570