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Primary Source: http://www.ercot.com/content/wcm/lists/172485/DemandandEnerg... (Excel file)

You can find the data they're referencing in the "Energy by Fuel Type" tab.

I don't think this will get you all of the wind power in Texas as the panhandle of Texas has at least one major utility participating in the SPP market as well which is next door.

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