The National Renewable Energy Laboratory has published "A Historical Analysis of Investment in Solar Energy Technologies (2000-2007)." This paper explores the private and public investment in solar energy and how it has fueled industry growth. It shows that investment in solar technologies increased at an annual rate of 145% from 2004 to 2007. At the same time, government support as a share of total investment dropped from 50% to 4% of the total.
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