The race to the bottom is more applicable to the panel manufacturers. The lowest cost producers are mostly Chinese companies, and the financial performance for these companies (ReneSola, Yingli Green Energy, Trina Solar, etc.) has been pretty terrible so far. Probably the best way to invest in solar through the stock market is to invest in a developer of solar projects. The best of these in my opinion in terms of scale and expertise is SunEdison (ticker: SUNE), and incidentally, the stock has been in free fall for various reasons over the past couple weeks, so this is probably a reasonable entry point.
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