Explosive growth in the number of renewable energy generators continues with 14,723 renewable generators connected to the grid in the PJM power pool, the world's largest wholesale power market. See http://www.pjm-eis.com/. Many of the renewable generators connected to the grid and feeding power into it are residential solar systems, while others are large, utility-scale wind, hydro, landfill gas, and biomass.
How quickly is the number of renewable energy generators increasing? Doubling in about 1 year.
At the end of 2009, PJM had 6,700 renewable generators in its system.
As distributed generation proliferates the electric industry is seeing now its future.