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Segment Reporting
 12 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
The Company’s segment structure reflects how management makes financial decisions and allocates resources. The Company manages its operations based on the combined results of the retail, wholesale and generation businesses with a geographical focus except for Vivint Smart Home operations which are reported within the Vivint Smart Home segment. Corporate represents the corporate business activities, and corporate shared services, to support the Company’s operating segments. Beginning in the fourth quarter of 2024, Corporate now includes interest expense related to its consolidated debt financing activities and income tax expense related to its consolidated U.S. federal, foreign and state income taxes conforming to the way the Company internally manages and monitors the business. Prior periods amounts have been recast for comparative purposes to reflect this change, which had no impact on the Company’s consolidated financial position, results of operations, and cash flows. The accounting policies of the segments are the same as those applied in the consolidated financial statements as disclosed in Note 2, Summary of Significant Accounting Policies.
NRG's chief operating decision maker ("CODM"), its chief executive officer, uses more than one measure to evaluate the performance of its segments and allocate resources, including net income/(loss) and various non-GAAP financial measures such as adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA. Net income/(loss) and Adjusted EBITDA are used to review business performance and allocate resources as it provides a clearer view of segment profitability by focusing on operational performance. Additionally, operating expenses’ impact on each operating segment results are analyzed. On a monthly basis, Adjusted EBITDA is compared against the budget, latest forecast, and prior period.
The Company had no customer that comprised more than 10% of the Company's consolidated revenues during the years ended December 31, 2024, 2023 and 2022.
Intersegment sales are accounted for at market.
For the Year Ended December 31, 2024
(In millions)TexasEastWest/Services/OtherVivint Smart Home
Corporate(a)
Eliminations
Total
Revenue(a)
$10,653 $11,707 $3,886 $1,932 $— $(48)$28,130 
Operating Expenses9,785 9,746 3,874 1,037 81 (48)24,475 
Depreciation and amortization323 158 114 767 41 — 1,403 
Impairment losses7 — 29 — — — 36 
Total operating cost and expenses10,115 9,904 4,017 1,804 122 (48)25,914 
(Loss)/gain on sale of assets(4)3 209 — — — 208 
Operating income/(loss)534 1,806 78 128 (122)— 2,424 
Equity in earnings of unconsolidated affiliates— — 20 — — — 20 
Impairment losses on investments— — (7)— — — (7)
Other income, net— (1)6 (15)54 — 44 
Loss on debt extinguishment— — — — (382)— (382)
Interest expense— — — — (651)— (651)
Income/(loss) before income taxes534 1,805 97 113 (1,101)— 1,448 
Income tax expense— — — — 323 — 323 
Net income/(loss) $534 $1,805 $97 $113 $(1,424)$— $1,125 
Balance sheet
Equity investments in affiliates$— $— $45 $— $— $— $45 
Capital expenditures369 3 16 23 61 — 472 
Goodwill643 721 153 3,494 — — 5,011 
Total assets$6,925 $8,021 $2,254 $6,624 $15,543 $(15,345)$24,022 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$22 $— $18 $8 $— $— $48 
 For the Year Ended December 31, 2023
(In millions)TexasEastWest/Services/Other
Vivint Smart Home(a)
Corporate(b)
Eliminations
Total
Revenue(b)
$10,476 $12,547 $4,281 $1,549 $— $(30)$28,823 
Operating Expenses8,353 14,361 5,021 858 133 (30)28,696 
Depreciation and amortization348 167 99 645 36 — 1,295 
Impairment losses2 4 20 — — — 26 
Total operating cost and expenses8,703 14,532 5,140 1,503 169 (30)30,017 
Gain on sale of assets1,319 259 — — — — 1,578 
Operating income/(loss)3,092 (1,726)(859)46 (169)— 384 
Equity in earnings of unconsolidated affiliates— — 16 — — — 16 
Impairment losses on investments— — (102)— — — (102)
Other income, net 2 (1)1 (15)60 — 47 
Gain on debt extinguishment— — — — 109 — 109 
Interest expense— — — — (667)— (667)
Income/(loss) before income taxes3,094 (1,727)(944)31 (667)— (213)
Income tax benefit— — — — (11)— (11)
Net income/(loss) $3,094 $(1,727)$(944)$31 $(656)$— $(202)
Balance sheet
Equity investments in affiliates$— $— $42 $— $— $— $42 
Capital expenditures495 5 27 18 53 — 598 
Goodwill643 721 221 3,494 — — 5,079 
Total assets(c)
$8,236 $13,712 $3,612 $6,619 $20,357 $(26,498)$26,038 
(a) Includes results of operations following the acquisition date of March 10, 2023
(b) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$5 $9 $16 $— $— $— $30 
(c) Tax related balances have been recast to Corporate for comparative purposes
 For the Year Ended December 31, 2022
(In millions)TexasEastWest/Services/Other
Corporate(a)
Eliminations Total
Revenue(a)
$10,057 $16,763 $4,706 $— $17 $31,543 
Operating Expenses8,444 15,998 4,106 86 17 28,651 
Depreciation and amortization361 241 87 31 — 720 
Impairment losses— 206 — — — 206 
Total operating cost and expenses8,805 16,445 4,193 117 17 29,577 
Gain/(loss) on sale of assets10 — 45 (3)— 52 
Operating income1,262 318 558 (120)— 2,018 
Equity in (losses)/earnings of unconsolidated affiliates(2)— 8 — — 6 
Other income, net4 1 1 50 — 56 
Interest expense— — — (417)— (417)
Income/(loss) before income taxes1,264 319 567 (487)— 1,663 
Income tax expense— — — 442 — 442 
Net income/(loss)$1,264 $319 $567 $(929)$— $1,221 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$4 $(26)$5 $— $— $(17)