Green energy is the least predictable kind. Nobody can say for certain when the wind will blow or the sun will shine. A field of solar panels might be cranking out huge amounts of energy one minute and a tiny amount the next if a thick cloud arrives. In many cases, renewable resources exist where transmission lines don't.
"The grid was not built for renewables," said Trieu Mai, senior analyst at the National Renewable Energy Laboratory.
http://www.latimes.com/nation/la-na-grid-renewables-20131203,0,1019786.story#ixzz2mPTWMb00
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