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Changes in Capital Structure (Tables)
9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Changes in NRG's Preferred Stock and Commons Shares Issued and Outstanding The following table reflects the changes in NRG's preferred and common stock issued and outstanding:
PreferredCommon
Issued and OutstandingIssuedTreasuryOutstanding
Balance as of December 31, 2022— 423,897,001 (194,335,971)229,561,030 
Shares issued under LTIPs— 1,011,448 — 1,011,448 
Shares issued under ESPP— — 86,516 86,516 
Issuance of Series A Preferred Stock 650,000 — — — 
Shares repurchased — — (1,322,141)(1,322,141)
Balance as of September 30, 2023650,000 424,908,449 (195,571,596)229,336,853 
Shares issued under LTIPs— 55,507 — 55,507 
Shares issued under ESPP— — 104,733 104,733 
Shares repurchased— — (3,732,657)(3,732,657)
Balance as of October 31, 2023
650,000 424,963,956 (199,199,520)225,764,436