By 2015, Clean Edge reports, solar-generated electricity will reach grid parity for residential customers in 11 states.

FORBES: Solar Power: Ready, Set, Grow

It has brought solar panel costs down dramatically over just a few years, bringing grid parity within sight in a number of markets, and kicking off what many see as a potential long-term energy revolution.

FORBES: Low Carbon Economies And Smart Grids: Watch Out For China