Changes in Capital Structure (Tables)

9 Months Ended

Sep. 30, 2012

Changes in Capital Structure Disclosure [Abstract]

Changes in NRG's common shares issued and outstanding

The following table reflects the changes in NRG's common shares issued and outstanding:

	Issued	Treasury		Outstanding
Balance as of December 31, 2011	304,183,720	(76,664,199	)	227,519,521
Shares issued under LTIP	608,128	—		608,128
Shares issued under ESPP	—	158,481		158,481
Balance as of September 30, 2012	304,791,848	(76,505,718	)	228,286,130