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Source: U.S. Energy Information Administration, Annual and Monthly Electric Generator Report. 
Note: Click to enlarge. 
Note: Data for 2012 planned additions are based on industry data submissions and monthly updates on planned wind facilities. Left-hand axis plots current capacity of existing generators by their initial date of operation. Capacity may change over time as generators are altered. For recent years, these data are synonymous with capacity additions. Early in the time period, this data series may be missing generators that have since retired.

windcaplarge

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