Hmmm I thought this post might attract firm opinion. I thought the US grid was at about 1 TW now. I think it's more about setting bold goals so they can work more aggressively toward them, even though it might seem rather unlikely to occur in reality. And of course Al has been out of the spotlight for a while, so he now gets spend his time in the sun again.
Having said that at current growth rates for Solar PV, I think it might have been shown that before 2025 this could perhaps occur, of course we can't predict such strong growth that far into the future with certainty. However stranger things in the world have happened. I suspect the reality is though that no single energy source will be reliable enough to be solely depended upon.
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