What is the customer service number for green mountain energy? The customer support phone number of Green Mountain Energy is +1 512-691-6100, 888-380-9410 (Click phone number to call).Who is green mountain power? Green Mountain Energy began in Vermont in August 1997 as an offshoot of Green Mountain Power to take advantage of electricity deregulation around the country. The company moved its headquarters to its current location in Austin, Texas, in September 2000.Who owns green mountain power company? Gaz Métro is the titular owner of Green Mountain Power, and Vermont Gas Systems, Inc., the only natural gas company in the state. The Montreal-based company acquired Green Mountain Power in 2007 and Vermont Gas Systems in 1986.
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