“Because wind energy is intermittent, there always must be conventional generation, primarily natural gas or coal, ready to supplement electricity when the wind either dies down or blows so hard wind generators cannot operate. Electric generation is also needed to provide what are called “ancillary” transmission services, such as maintaining proper voltage throughout the transmission grid.” —Texas Co-op Power, August 2008
https://www.wind-watch.org/quotes.php?t=176
