Green Mountain Energy
A U.S. retail electricity brand that provides renewable-energy plans and related clean-energy products through renewable energy credits and other programs.
Last updated October 17, 2026
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Overview
Green Mountain Energy is a United States retail electricity brand focused on renewable and lower-emissions energy products. Founded in Vermont in 1997 by Sam Wyly as an offshoot of Green Mountain Power, the company was established during the early development of competitive electricity markets in the United States. Its original strategic rationale was to use electricity-market deregulation, particularly the opening of the Texas market, to give customers an alternative to conventional utility supply. The company moved its headquarters to Austin, Texas, in September 2000 and began serving Texas customers in January 2002. It was the first retail supplier to offer alternative energy in the Texas market, according to the company’s historical account. Rather than generally owning and operating all of the generation associated with each customer account, Green Mountain markets electricity products supported by renewable energy credits and related clean-energy arrangements. This model enables customers to select renewable electricity options while remaining connected to the broader regional electricity grid. Green Mountain subsequently expanded beyond Texas. In August 2009 it entered New York City within the Con Edison service territory, and in June 2012 it expanded into Pennsylvania through the PECO and PPL service territories. Its residential activities have also included retail and utility-partner offerings in states with competitive or otherwise eligible electricity markets, including Maryland, Illinois, Massachusetts, New Jersey, New York, Pennsylvania, and Texas. In regulated markets, the brand has worked with utilities such as Portland General Electric in Oregon to make renewable-energy products available without requiring customers to change their underlying distribution utility. The brand’s commercial and industrial business began in 2004 and has served business customers in markets including Texas, New York, and Pennsylvania. Green Mountain Energy Solutions was introduced in 2011 as a separate division for broader commercial clean-energy needs. The company has also developed programs beyond standard electricity supply, including customer solar-generation credits, residential solar leasing, electric-vehicle-oriented electricity products, and the Sun Club initiative, which supports nonprofit organizations with solar and renewable-energy installations or related resources. Green Mountain launched its Renewable Rewards buy-back program in May 2009. The program provided credits to eligible customers with renewable-generation systems when they sent excess electricity back to the grid. In April 2011 the company introduced a residential solar-panel leasing program and announced Pollution Free EV, a wind-electricity product aimed at electric-vehicle owners. Its business-to-business visibility increased through a 2011 agreement to supply the Empire State Building with 100% renewable energy for two years. In 2012 it partnered with the National Football League to provide renewable electricity for Super Bowl XLVI. NRG Energy acquired Green Mountain Energy in November 2010 for a reported $350 million. The brand initially continued as a standalone NRG subsidiary and subsequently became one of NRG’s consumer-facing brands. Green Mountain Energy remains positioned around renewable electricity, customer choice, and practical clean-energy participation rather than around a single generation asset or technology. Its principal customer proposition is the ability to select renewable-backed electricity plans, with additional offerings for businesses, solar customers, electric-vehicle users, and organizations seeking visible sustainability initiatives.
History
Green Mountain Energy was founded in Vermont in 1997 by Sam Wyly as an offshoot of Green Mountain Power. The company emerged during the development of competitive electricity markets, with the objective of selling renewable electricity options to customers who could choose an electricity supplier other than the incumbent utility. Its early strategy was closely associated with the anticipated deregulation of the Texas electricity market. In September 2000, Green Mountain moved its headquarters to Austin, Texas. The relocation placed the company near the market that became its principal early growth opportunity. In January 2002, it began serving Texas customers and became the first supplier in the state to offer alternative energy products. The company’s retail model generally relied on renewable energy credits and related contractual arrangements, allowing customers to purchase renewable-backed electricity while using the existing power grid. Green Mountain expanded its portfolio and geographic reach during the following decade. Its commercial and industrial division began in 2004, extending the brand beyond residential electricity customers. In May 2009, the company introduced Renewable Rewards, a buy-back program that offered credits to qualifying customers who generated renewable electricity at home and exported surplus power to the grid. In August of the same year, it entered New York City in the Con Edison service area. The company launched additional clean-energy products in 2011. These included a residential solar-panel leasing program and Pollution Free EV, a wind-electricity product marketed to electric-vehicle owners. Green Mountain also created Green Mountain Energy Solutions as a commercial division in 2011. Its institutional profile grew through a two-year agreement to supply the Empire State Building with 100% renewable energy. In February 2012, it worked with the National Football League to provide 15 million kWh of renewable energy for Super Bowl XLVI. In June 2012, Green Mountain entered Pennsylvania through the PECO and PPL service territories. NRG Energy acquired Green Mountain Energy in November 2010 for a reported $350 million. After the acquisition, the company operated initially as a standalone subsidiary, while later becoming one of NRG Energy’s brands. The transaction gave NRG an established consumer renewable-energy identity and allowed Green Mountain to continue marketing specialized electricity products under its own name. Green Mountain’s market presence has included residential customers in U.S. states with unregulated or competitive electricity markets, including Maryland, Illinois, Massachusetts, New Jersey, New York, Pennsylvania, and Texas. It has also partnered with utilities in regulated markets, including Portland General Electric in Oregon, to offer renewable products through utility programs. Its commercial business has focused on Texas, New York, and Pennsylvania. A further element of the brand’s community and sustainability positioning is Sun Club, through which Green Mountain supports nonprofit organizations with solar and renewable-energy resources. Across its history, the company has combined retail electricity supply with renewable energy credits, customer-generation programs, solar offerings, electric-vehicle products, commercial procurement, and sustainability partnerships. It is now best understood as an NRG-owned renewable electricity brand operating within selected U.S. retail and utility-partner markets.
- 2012
Pennsylvania market entry
[1]The company expanded into the PECO and PPL service territories.
- 2011
Solar and electric-vehicle products expand
[1]Green Mountain launched residential solar leasing and announced Pollution Free EV.
- 2010
Acquisition by NRG Energy
[1]NRG Energy acquired Green Mountain Energy for a reported $350 million.
- 2009
Renewable Rewards launches
[1]Green Mountain introduced a program that credited eligible customers for surplus renewable electricity sent to the grid.
- 2009
New York City expansion
[1]The company began serving customers in the Con Edison territory in New York City.
- 2004
Commercial and industrial division begins
[1]The company expanded beyond residential supply by establishing commercial and industrial electricity activities.
- 2002
Texas retail service begins
[1]Green Mountain began serving Texas customers and became the first supplier in the state to offer alternative energy.
- 2000
Headquarters move to Austin
[1]The company moved its headquarters from Vermont to Austin, Texas, in preparation for growth in competitive electricity markets.
- 1997
Green Mountain Energy is founded
[1]Sam Wyly founded the company in Vermont as an offshoot of Green Mountain Power.
Products and positioning
An environmentally focused retail electricity brand offering renewable-backed power choices and complementary clean-energy programs to residential, commercial, and institutional customers.
Residential electricity
Renewable electricity plans
Green Mountain’s core offering is retail electricity backed by renewable energy credits and related renewable-energy arrangements. Plans are marketed to residential customers who want renewable electricity attributes associated with their consumption while remaining connected to the regional grid. Availability varies by state, electricity market, and utility territory.
Distributed generation · 2009
Renewable Rewards
Renewable Rewards is a customer-generation buy-back program launched in 2009. It provides credits to eligible customers with renewable facilities, such as residential systems, when excess electricity from those facilities is delivered to the electric grid.
Solar energy · 2011
Residential solar leasing
Introduced in 2011, the residential solar leasing program was designed to give homeowners access to solar panels through a leasing arrangement rather than requiring an outright equipment purchase. The available terms and present status are not specified in the supplied reference material.
Electric-vehicle electricity · 2011
Pollution Free EV
Pollution Free EV was announced in 2011 as a wind-electricity product for electric-vehicle owners. It linked the brand’s renewable-energy proposition with the growing use of electric transportation.
Business electricity · 2004
Commercial and industrial renewable electricity
Green Mountain’s commercial and industrial division serves business customers with renewable electricity products and related procurement solutions. The division began in 2004 and has operated in markets including Texas, New York, and Pennsylvania.
Community renewable energy
Sun Club
Sun Club is a community-oriented initiative through which Green Mountain supports nonprofit organizations with solar and renewable-energy resources. It extends the brand beyond electricity retailing into sustainability partnerships and charitable clean-energy projects.
Marketing campaigns
- 2012Super Bowl XLVI renewable-energy partnership
United States
Green Mountain partnered with the National Football League to provide 15 million kWh of renewable energy for Super Bowl XLVI.
Outcome. The partnership associated the brand with a major national sporting event and its renewable-energy supply.
- 2011Empire State Building renewable-energy agreement
New York City
Green Mountain signed a two-year agreement to provide 100% renewable energy to the Empire State Building.
Outcome. The agreement was described as New York City’s largest commercial green-power purchase at that time.
Brand decisions
2011
Solar leasing and Pollution Free EVProduct launchBackground
The company sought to connect its renewable electricity brand with residential solar adoption and electric-vehicle use.
Action taken
Green Mountain introduced a residential solar leasing program and announced Pollution Free EV, a wind-electricity product for electric-vehicle owners.
Aftermath
These initiatives expanded the brand into adjacent clean-energy categories beyond conventional retail electricity plans.
2010
NRG Energy acquisitionM&ABackground
Green Mountain had developed a recognizable renewable-electricity retail business across several U.S. markets, while NRG Energy sought to expand its consumer and clean-energy brand portfolio.
Action taken
NRG Energy acquired Green Mountain Energy in November 2010 for a reported $350 million.
Aftermath
Green Mountain initially operated as a standalone subsidiary and later became one of NRG Energy’s brands.
Acquisition price. $350 million (November 2010)
2009
Renewable Rewards buy-back programProduct launchBackground
Residential renewable generation created an opportunity for customers to export surplus electricity to the grid.
Action taken
The company launched Renewable Rewards, providing credits to eligible customers for excess renewable electricity sent to the grid.
Aftermath
The program broadened Green Mountain’s proposition from renewable electricity supply to customer-owned generation.
Sources1 sources
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