Remember that when Obama signed the American Recovery and Reinvestment Act of 2009, over $75 billion was earmarked for renewable energy investments. So despite an uptick in spending by the big boys, there is a lot more to go. But the real opportunity is still in the overlooked, and under-appreciated small-cap companies that have the potential to see their sales explode as federal incentives spur investment, and demand.

This includes A-Power Energy Generation Systems (Nasdaq: APWR), a Chinese wind turbine manufacturer that recently announced plans to build a manufacturing facility here in the U.S. to supply turbines to North American projects. A-Power’s stock has traded off its recent high of $20.55 and is now trading at only $12.21 a share and with a forward PE of less than 10. This is a great value for a company expected to increase EPS by 53% next year on a 77% increase in revenue.