I don't see any of those methods ever getting implemented beyond boutique levels- they aren't practical for widespread use.
I think britian was aiming for something like 20% by 2012, i think it at least something like 5% of our energy production already... i will need to go figure hunting...
But britian is an island so easy access to water and wind energy, the us is huge so probably not too difficult for them to get a decent percentage either...
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