From earlier this week:

Google...announced a new strategic initiative to develop electricity from renewable energy sources that will be cheaper than electricity produced from coal. The newly created initiative, known as RE<C, will focus initially on advanced solar thermal power, wind power technologies, enhanced geothermal systems and other potential breakthrough technologies.

Many prefab companies incorporate solar power and other environmentally friendly features into their housing solutions. eSolar (a Google partner) incorporate prefab features into their solar solutions:

By leveraging established commercial suppliers to mass manufacture thousands of small heliostats, eSolar realizes economy-of-scale benefits at much smaller power plant sizes than traditional solar generation techniques. Our heliostats are designed to fit efficiently into shipping containers to keep transportation costs low, and they are pre-assembled at the factory to minimize on-site labor....

By employing a repeating frame structure and a revolutionary calibration system, eSolar has eliminated the need for high-precision surveying, delicate installation, and individual alignment of mirrors. Minimal skilled labor is needed to build the solar field, allowing for mirror deployment efficiencies that scale with project size and deadlines.

Very interesting: prefab meet solar; solar meet prefab.