Regulatory Matters	6 Months Ended
Jun. 30, 2026
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters Environmental regulatory matters are discussed within Note 16, Environmental Matters. NRG operates in a highly regulated industry and is subject to regulation by various federal, state and provincial agencies. As such, NRG is affected by regulatory developments at the federal, state and provincial levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG’s wholesale and retail operations. In addition to the regulatory proceeding noted below, NRG and its subsidiaries are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management’s opinion, the disposition of these ordinary course matters will not materially adversely affect NRG’s consolidated financial position, results of operations, or cash flows. NYSPSC – Order to Show Cause — The NYSPSC issued an order referred to as the Retail Reset Order in December 2019 that limited the offers of ESCOs for electric and natural gas to three compliant products: guaranteed savings from the utility default rate, a fixed rate commodity product that is priced at no more than 5% greater than the trailing 12-month average utility supply rate or New York-sourced renewable energy that is at least 50% greater than the prevailing New York Renewable Energy Standard for load serving entities. Subsequently, the NYSPSC issued an order referred to as the Clarification Order on September 18, 2020 stating the Retail Reset Order applies only to prospective customer contracts. NRG took action to comply with the order when it became effective April 16, 2021. On January 8, 2024, the NYSPSC notified eight of NRG’s retail energy suppliers (serving both electricity and natural gas) of alleged non-compliance with New York regulatory requirements. NRG responded to the notices in February 2024 and on September 23, 2025, the NYSPSC issued a follow-up order further alleging separately that the NRG retail supplier responsible for selling natural gas to commercial and industrial customers had been improperly serving residential customers. On April 16, 2026, the NYSPSC approved a settlement agreement which resolved all outstanding claims and permitted NRG to maintain its eligibility to serve customers. The agreement requires NRG to: (i) establish a $50 million fund for distribution to certain legacy customers; (ii) offer those same customers a one-time opportunity to enroll on a special discounted 12-month rate; and (iii) distribute approximately $920 thousand to certain low-income customers. This matter was accrued for as of June 30, 2026.

NRG operates in a highly regulated industry and is subject to regulation by various federal, state and provincial agencies. As such, NRG is affected by regulatory developments at the federal, state and provincial levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG’s wholesale and retail operations.

In addition to the regulatory proceeding noted below, NRG and its subsidiaries are parties to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management’s opinion, the disposition of these ordinary course matters will not materially adversely affect NRG’s consolidated financial position, results of operations, or cash flows.

NYSPSC – Order to Show Cause — The NYSPSC issued an order referred to as the Retail Reset Order in December 2019 that limited the offers of ESCOs for electric and natural gas to three compliant products: guaranteed savings from the utility default rate, a fixed rate commodity product that is priced at no more than 5% greater than the trailing 12-month average utility supply rate or New York-sourced renewable energy that is at least 50% greater than the prevailing New York Renewable Energy Standard for load serving entities. Subsequently, the NYSPSC issued an order referred to as the Clarification Order on

September 18, 2020 stating the Retail Reset Order applies only to prospective customer contracts. NRG took action to comply with the order when it became effective April 16, 2021. On January 8, 2024, the NYSPSC notified eight of NRG’s retail energy suppliers (serving both electricity and natural gas) of alleged non-compliance with New York regulatory requirements. NRG responded to the notices in February 2024 and on September 23, 2025, the NYSPSC issued a follow-up order further alleging separately that the NRG retail supplier responsible for selling natural gas to commercial and industrial customers had been improperly serving residential customers. On April 16, 2026, the NYSPSC approved a settlement agreement which resolved all outstanding claims and permitted NRG to maintain its eligibility to serve customers. The agreement requires NRG to: (i) establish a $50 million fund for distribution to certain legacy customers; (ii) offer those same customers a one-time opportunity to enroll on a special discounted 12-month rate; and (iii) distribute approximately $920 thousand to certain low-income customers. This matter was accrued for as of June 30, 2026.