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From a practical standpoint, there is no cheaper source of dependable energy then coal. This ignores environmental impacts and mining accidents though.

Wind and solar have very high up front costs and require other sources of energy to maintain the steady stream supply, thus they are still not practical for more then small portion of power. Many of these systems never return the initial investment of the generators.

Nuclear energy is actually very cheap, from a operating standpoint, but ecological and waste storage costs increase the overall costs. Adding the cost of creating massive waste lands is hard to quantify, but is certainly expensive/

Oil is also a possible energy source, but major deposits in the United States have no been exploited as of yet and political stability in other regions raise transporting costs and creates wars.

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