You have to use other sources to guarantee capacity, because the wind doesn't always blow when you need it.In addition, there is a need of new capacity because of adding a significant amount of wind to the system.
RPS
Colorado: 20% of electricity from wind and solar means 18% new nonrenewables, to
Video-- Green Collar Jobs: Why Renewable Energy & Energy Efficiency are Economic Powerhouses
The Environmental and Energy Study Institute and the American Solar Energy Society unveil a new study that finds that "green collar" jobs in renewable energy and energy efficiency generate nearly $1 trillion today and that figure could grow to $4.5 trillion by 2030. Presenters present the case study of the state of Ohio as an incubator of such jobs.
Video -- Renewable Portfolio Standards Create New Wind Market
Eric Thumma of the Spanish wind turbine provider Iberdrola outlines the market for wind power, particularly as states have enacted their Renewable Portfolio Standard mandates that attracted the firm to the U.S.
Video: NY Public Service Commission Considers Renewable Portfolio Standard During Meeting
The New York State Public Service Commission considers proposal Regarding a Retail Renewable Portfolio Standard.