Thursday, February 14th 2013, 4:50 PM EST
This graph shows the problem with wind power: the wind doesn't blow when we need it most.
This is why the cost estimates for wind in cent/kWh need to take into account the price of energy storage and/or backup. That easily doubles the real price.
The graph from Texas in August 2009, but similar graphs abound.
http://www.faqs.org/sec-filings/100301/Energy-Future-Holdings-Corp-TX-_8-K/dex991.htm#b
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