Alternative Energy vs Scalability

I am 100% all about using alternative energy to it's full beneficial potential. But I feel that such enthusiasm for the concept should not preclude hard, sometimes challenging facts about the nitty gritty and details. If we're going to do it, we need to do it right.

Robert Bryce has a great piece in the WSJ that brings some such facts to the forefront of the debate.

For the sake of convenience, let's convert the energy produced by U.S. wind and solar installations into oil equivalents.

The conversion of electricity into oil terms is straightforward: one barrel of oil contains the energy equivalent of 1.64 megawatt-hours of electricity. Thus, 45,493,000 megawatt-hours divided by 1.64 megawatt-hours per barrel of oil equals 27.7 million barrels of oil equivalent from solar and wind for all of 2008.

Now divide that 27.7 million barrels by 365 days and you find that solar and wind sources are providing the equivalent of 76,000 barrels of oil per day. America's total primary energy use is about 47.4 million barrels of oil equivalent per day.

Of that 47.4 million barrels of oil equivalent, oil itself has the biggest share -- we consume about 19 million barrels per day. Natural gas is the second-biggest contributor, supplying the equivalent of 11.9 million barrels of oil, while coal provides the equivalent of 11.5 million barrels of oil per day. The balance comes from nuclear power (about 3.8 million barrels per day), and hydropower (about 1.1 million barrels), with smaller contributions coming from wind, solar, geothermal, wood waste, and other sources.

Here's another way to consider the 76,000 barrels of oil equivalent per day that come from solar and wind: It's approximately equal to the raw energy output of one average-sized coal mine.