Chinese margin of error

China's declared goal is to generate 15 percent of its electricity by 2020 from non-fossil sources.

If China meets half of its target, it will command half of the world's market for wind and solar energy.

If China meets its entire target, it will still need to add more new coal generation capacity than the entire U.S. coal fleet.

The margin of error in projections for China's electricity demand for 2030 is larger than the entire generation capacity of the United States.