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Seems like every time we turn around, the Department of Energy is making another announcement about our nation's energy future (if you believe that most cars will eventually be electric, these announcements are about our automotive future as well). Just a few days ago, we told you about the DOE's promising investment of $62 million into concentrating solar technology. Good news. Then we told you about the DOE's request for commentary on squeezing the last precious drops of fossil fuels from the

In order for electric vehicles to make any actual impact on greenhouse gas emissions, a great deal of progress will need to be made on renewable sources of power generation. Wind power generation has been expanding rapidly, and solar is growing in some areas. Another source with huge potential is geothermal. If the natural heat energy held within the planet can be tapped, it could be almost limitless. That's easier said than done in most places but there are some areas where it could be very pra