Mother Nature Network: Cheaper solar power is something that most environmentalists dream about. Indeed prices have been coming down dramatically in recent years. And though it may sound counterintuitive, getting too cheap, too soon can be a major problem. Manufacturers need reliable projections of future costs. Installers have to remain profitable despite diminishing returns on the hardware they sell. And quality can become compromised if all we care about is the price of panels. That's why many in the solar industry...