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Changes in Capital Structure (Tables)
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Changes in NRG's common shares issued and outstanding
As of March 31, 2021 and December 31, 2020, the Company had 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's common stock issued and outstanding:
IssuedTreasuryOutstanding
Balance as of December 31, 2020423,057,848 (178,825,915)244,231,933 
Shares issued under LTIPs461,273 — 461,273 
Balance as of March 31, 2021423,519,121 (178,825,915)244,693,206 
Shares issued under LTIPs790 — 790 
Shares issued under ESPP— 59,967 59,967 
Balance as of May 6, 2021
423,519,911 (178,765,948)244,753,963