May 24 (Reuters) - Xcel Energy Inc :
* Company expects wind to make up 24 percent of its electricity supply by 2020
* Expects to triple solar energy on its system by 2020
* Also ended coal operations at Black Dog plant in Minnesota and Cherokee unit 3 in Colorado
* Ended coal operations at Black Dog plant as company works to reduce 25 percent of coal-fueled capacity it owns by 2018 Source text for Eikon: Further company coverage:
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