The sampling of 13 power-purchase agreements (PPAs) totalling 1.768GW was mainly from the country’s interior, which has the best wind resource and most productive operating assets. It also is where most new capacity is being built.
In 2013, primary report authors Ryan Wiser and Mark Bollinger of the department's Lawrence Berkeley Laboratory sampled 26 PPAs totalling 3.647GW. Prices averaged about 2.5
