In most places, coal is the cheapest. It’s abundant and we have many, many plants to process it in. If you consider energy efficiency a fuel, some argue that it is the cheapest: http://solveclimate.com/blog/20090930/2-5-cents-kilowatt-hour-americas-cheapest-cleanest-fuel-holds-steady. There is hope that in the future, renewable sources like wind and solar will become cheaper than coal, as the technology and transmission for these energy sources gets better.
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