NRG Energy (NRG) - Market capitalization

Market cap: £15.94 Billion

As of September 2026 NRG Energy has a market cap of £15.94 Billion. This makes NRG Energy the world's 1120th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of NRG Energy from 2003 to 2026

End of year Market Cap

Year	Marketcap	Change
2026	£15.94 B	-31.02%
2025	£23.10 B	55.68%
2024	£14.84 B	62.01%
2023	£9.16 B	51.19%
2022	£6.05 B	-22.45%
2021	£7.81 B	16.14%
2020	£6.72 B	-10.86%
2019	£7.54 B	-14.7%
2018	£8.84 B	32.62%
2017	£6.67 B	112.89%
2016	£3.13 B	25.6%
2015	£2.49 B	-57.18%
2014	£5.82 B	3.37%
2013	£5.63 B	22.85%
2012	£4.58 B	71.16%
2011	£2.68 B	-14.32%
2010	£3.12 B	-15.57%
2009	£3.70 B	-0.1%
2008	£3.70 B	-28.17%
2007	£5.16 B	47.65%
2006	£3.49 B	58.62%
2005	£2.20 B	34.91%
2004	£1.63 B	-32.88%
2003	£2.43 B

End of Day market cap according to different sources

On Sep 27th, 2026 the market cap of NRG Energy was reported to be:

£15.94 Billion

by Nasdaq

£15.94 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
AES AES	£8.01 B	-49.72%	🇺🇸 USA
Edison International EIX	£15.30 B	-3.97%	🇺🇸 USA
Exelon Corporation EXC	£31.39 B	96.98%	🇺🇸 USA
Sempra SRE	£38.49 B	141.52%	🇺🇸 USA
Southern Company SO	£72.03 B	351.88%	🇺🇸 USA
Nextera Energy NEE	£119.89 B	652.18%	🇺🇸 USA
Duke Energy DUK	£66.77 B	318.88%	🇺🇸 USA
Entergy ETR	£35.57 B	123.21%	🇺🇸 USA
OGE Energy OGE	£6.99 B	-56.13%	🇺🇸 USA

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of NRG Energy (NRG)

Market cap: £15.94 Billion