Solar Panel Stocks have fallen off a cliff in 2011 driven by a massive oversupply in solar modules.The 2010 boom in solar energy demand led to rapid expansion by hundreds of established as well as new solar panel suppliers.This has led to a big increase in solar cell capacity.The demand in 2011 has not been enough to compensate for the massive increase in supply.Many of the higher cost companies in Western markets have already closed down operations with the news of a solar company closing down becoming a daily affair.The last time the wave of solar bankruptcies occured was during the 2008 Lehman crisis.At that time a few of the thin film companies had gone belly up as polysilicon prices had crashed.The sharp drop in solar panel stock provides a good time to enter the solar space as the valuations are at a historical low.Many of the solar panel stocks currently are being priced at a fraction of their sales and book value as the market expects almost every company to shut down.However solar demand is growing as the declining costs of solar energy is its biggest advantage.Also solar power growth is being vastly underestimated by policymakers and analysts.This short term pain is great as it provides a once in a lifetime oppurtunity to buy the solar panel leaders.