But wind farms--which substitute for coal as a fuel for electricity--have little to do with oil prices.

FORBES: The Oilmen Cometh

Cheap US gas is already driving down the price of the biggest substitute for generating electricity, coal, freeing it up for export to Europe, where it is displacing Europe's relatively highly-priced gas.

BBC: Burning issues for the world's future

China is already investing billions of dollars to substitute hydropower (which counts as a renewable energy source) for coal and gas in electricity generation.

FORBES: Pollution And Prosperity