Better UK wind prediction means less conventional power needed.

May 25, 2011 Clean Energy 

National Grid upgrades wind prediction from 85 to 87%, meaning more 1.5 GW fossil-fuel capacity can be saved.

Renewables are being added to the US grid at almost no cost.

May 19, 2011 Clean Energy 

So studies say: a fraction of one percent in most states. Intermittency costs are more than compensated by protection from volatile gas prices and coal-plant EPA compliance costs.