[5][6] NRG serves over 7 million retail customers in 24 US states including Texas, Connecticut, Delaware, Illinois, Maryland, Massachusetts, New Jersey, New York, Pennsylvania, Ohio; the District of Columbia, and eight provinces in Canada.

By 2002, the debt had reached $9.4 billion, and NRG Energy sold its power plants in Hungary and the Czech Republic.

After GenOn's exit in 2018,[20] the NRG fleet shrunk to 23 GW but retained 2.9 million retail customers.

[21] In a partnership with Cypress Creek Renewables, NRG is offering a long-term, fixed price, consumer solar energy project in June 2018.

Cypress Creek Renewables will build, own, and operate three solar gardens in Texas that will have a combined power capacity of 25 MW.

[22] The solar installations are expected to provide 10 percent of Sysco's electricity nationwide by generating 25 megawatts of power.

[28] In 2006, NRG Energy bought Texas Genco from a group of private equity firms for roughly $5.9 billion.

In August 2013, NRG acquired Energy Curtailment Specialists, a Buffalo, New York-based Demand response company.

RDS headquarters remained in Wall Township, New Jersey while they operated under NRG Residential Solar Solutions.

The plant consumes 525,000 tons of logging debris and municipal wood waste annually and can produce 50 MW of power.

Antelope Elk Energy Center is also a natural gas facility located in Abernathy that creates 744 MW of power.

[51] NRG Energy partnered with Cummins in December 2017 to offer backup generators to run as part of an asset-backed demand response system.

The Cummins natural-gas-fired genset would be used when the grid is down, and it could shave 10 to 15 percent off energy bills by running it as part of an aggregated fleet of an "estimated hundreds of megawatts capacity".

The backup generators help gas stations, supermarkets, ATMs, and other everyday life necessities during power outages from hurricanes or other natural disasters.

The analytics engine found the best combination of distributed resources for every building in a given territory and showed what it was worth to each customer.

NRG tested SpaceTag to gather "60 megawatts of flexible clean energy capacity for key parts of SCE's [Southern California Edison] Orange County and Los Angeles power grid".

The platform, developed by NRG's Station A research team in San Francisco, was originally intended to help with customer acquisition but has since evolved.

[54] After the GenOn merger in 2012, NRG had 47,000 MW of total generation capacity, enough to power approximately 40 million homes.

[55] Its nearly 100 power plants were located in 18 states in the Northeast, Chicago area, Gulf Coast, Southwest, Nevada, and California.

NRG Yield had a diverse portfolio of energy generation including wind, solar, and natural gas, with a total operating capacity of 5,100 MW.

Cleco Corporate Holdings purchased NRG's South Central business for $1 billion in price and cash proceeds.

[62] In 2016, NRG sold the EVgo charging network to Vision Ridge Partners, a Colorado-based sustainable-energy investment firm, for an undisclosed amount.

[68] In March 2021, EVgo announced plans to install chargers at midwest retail chain Meijer's superstores.

[71][72] In 2012, NRG Energy partnered with the DLR Group to design an open-air, solar system for Patriot Place in Massachusetts.

[73] The solar panel canopies also offer weather protection and reduce carbon emissions by an estimated 800 metric tons a year.

The stadium received power from 600 solar panels and used only LEDs to light up the field, using 60% less energy than previously.

[76] NRG Energy installed 11,000 solar panels and 14 wind turbines at the Eagles’ Lincoln Financial Field stadium.

[77] New York State Assemblywoman Aravella Simotas has been chair of a coalition to support the utility in their plan to replace its power plant in Astoria with a newer generator.

For example, at 6.40 ($/kW – Month), the 12 actively listed facilities would produce an annual capacity market revenue of $42.8 million for NRG.

The filing states that since the proposed capacity is not 25 MW greater than the existing facility, Article 10 regulation is not required.