I was reading an interesting article about Evergreen Solar the other day, and what caused its downfall. When the company was first formed, it succeeded because it invented a way to harvest solar power that avoided using expensive silicon and used cheaper alternative materials instead. But since then, the cost of using silicon in solar panels has fallen dramatically, and Evergreen's manufacturing process became a liability rather than an asset. That sucks for them, but it hardly indicates problems with solar power in general. Quite the opposite. We should be celebrating the fact that the cost of producing solar energy is dropping rapidly, on a Moore's Law-like trajectory. It's quite possible that some time within the next decade, it will reach price parity with dirtier forms of energy like coal/oil.