v3.25.2
Cover
Jul. 22, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 22, 2025
Entity File Number 001-15891
Entity Registrant Name NRG ENERGY, INC.
Entity Central Index Key 0001013871
Entity Tax Identification Number 41-1724239
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 910 Louisiana Street
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77002
City Area Code 713
Local Phone Number 537-3000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.01
Trading Symbol NRG
Security Exchange Name NYSE
Entity Emerging Growth Company false