In January 2002, Green Mountain began serving the Texas market and was the first to offer alternative energy in the state.

[3] In August 2009 Green Mountain Energy expanded to New York City, serving those in the Con Edison service territory.

[9] In February 2012, the company partnered with the National Football League (NFL) to power Super Bowl XLVI with 15 million kWh of renewable energy.

[11][12] Green Mountain Energy also partners with utilities in regulated markets in the U.S., such as Portland General Electric (PGE) in Oregon, to offer their products.

[citation needed] Green Mountain's commercial and industrial division offers products to customers in Texas, New York, and Pennsylvania.