Cutting costs has been the key to solar’s rapid expansion this decade. The lion’s share of cost reductions in the solar industry has come from reductions in module prices. The $4 per watt you’d have paid in 2006 for modules alone gets you the entire residential solar system installed today.
And then along came third party financing, which made solar available to all. The $20,000 or $30,000 a homeowner once needed to pay for a solar system can now be afforded through a car-like low monthly payment.
So what's next for the industry's next big cost breakthrough?