Good question, david.
The statistics for renewable energy outputs of the US are interesting. Energy output for the year is measured in quadrillion btus. A quadrillion is one thousand million million, and a btu is a British thermal unit, or the amount of energy it takes to heat one pound of water one degree.
According to the statistics that I found, renewable energy production has remained fairly constant. Between 1989 and 2007, it has fluctuated between about 6 and 7 quadrillion btus, with the most recent data from 2007 being 6.813 quadrillion btus.
Hope this helps!
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