Solar and Wind Just Passed Another Big Turning Point
http://www.bloomberg.com/news/articles/2015-10-06/solar-wind-reach-a-big-renewables-turning-point-bnef
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https://en.wikipedia.org/wiki/Capacity_factor
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http://www.businessspectator.com.au/article/2015/9/11/energy-markets/how-do-power-generator-capacity-factors-vary-across-world
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Solar, Wind Now Cheapest Electricity to Generate in Germany and UK
http://www.sustainablebrands.com/news_and_views/cleantech/mike_hower/solar_wind_now_cheapest_electricity_generate_germany_uk
Utility-scale solar costs down by half in last five years alone
http://arstechnica.com/science/2015/10/utility-scale-solar-costs-down-by-half-in-last-five-years-alone/
Utility-Scale Solar 2014: An Empirical Analysis of Project Cost, Performance, and Pricing Trends in the United Stateshttps://emp.lbl.gov/sites/all/files/lbnl-1000917.pdf
https://emp.lbl.gov/sites/all/files/lbnl-1000917%20presentation.pdf
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http://marketrealist.com/2015/09/capacity-factors-continue-indicate-shift-coal-natural-gas/
Utility-Scale Solar 2014: An Empirical Analysis of Project Cost, Performance, and Pricing Trends in the United Stateshttps://emp.lbl.gov/sites/all/files/lbnl-1000917.pdf
https://emp.lbl.gov/sites/all/files/lbnl-1000917%20presentation.pdf
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http://marketrealist.com/2015/09/capacity-factors-continue-indicate-shift-coal-natural-gas/