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Segment Information
 9 Months Ended
Sep. 30, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
Operating segments are determined based on information used by the CODM in deciding how to evaluate performance and allocate resources. We have five reportable segments consisting of the Mid-Atlantic, Midwest, New York, ERCOT, and all other power regions referred to collectively as “Other Power Regions.”
The basis for our reportable segments is the integrated management of our electricity business that is located in different geographic regions, and largely representative of the footprints of ISO/RTO and/or NERC regions, which utilize multiple supply sources to provide electricity through various distribution channels (wholesale and retail). Our hedging strategies and risk metrics are also aligned to these same geographic regions. Descriptions of each of our five reportable segments are as follows:
•Mid-Atlantic represents operations in the eastern half of PJM, which includes New Jersey, Maryland, Virginia, West Virginia, Delaware, the District of Columbia, and parts of Pennsylvania and North Carolina.
•Midwest represents operations in the western half of PJM and the United States footprint of MISO, excluding MISO’s Southern Region.
•New York represents operations within NYISO.
•ERCOT represents operations within Electric Reliability Council of Texas that covers a majority of the state of Texas.
•Other Power Regions:
•New England represents operations within ISO-NE.
•South represents operations in FRCC, MISO’s Southern Region, and the remaining portions of SERC not included within MISO or PJM.
•West represents operations in WECC, which includes CAISO.
•Canada represents operations across the entire country of Canada and includes AESO, OIESO, and the Canadian portion of MISO.
The CODM evaluates the performance of our electric business activities and allocates resources based on Operating revenues net of Purchased power and fuel expense (RNF). We believe this is a useful measurement of operational performance, although it is not a presentation defined under GAAP and may not be comparable to other companies’ presentations or deemed more useful than the GAAP information provided elsewhere in this report. Our operating revenues include all sales to third parties as well as government assistance. Purchased power costs include all costs associated with the procurement and supply of electricity including capacity, energy, and ancillary services. Fuel expense includes the fuel costs for our owned generation and fuel costs associated with tolling agreements. The results of our other business activities are not regularly reviewed by the CODM and are therefore not classified as operating segments or included in the regional reportable segment amounts. These activities include wholesale and retail sales of natural gas, energy-related sales in the United Kingdom, as well as sales of other energy-related products and sustainable solutions that are not significant to our overall results of operations. Further, our unrealized mark-to-market gains and losses on economic hedging activities and our amortization of certain intangible assets and liabilities relating to commodity contracts recorded at fair value from mergers and acquisitions are also excluded from the regional reportable segment amounts. The CODM does not use a measure of total assets in making decisions regarding allocating resources to or assessing the performance of these reportable segments.
The following tables disaggregate the revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The disaggregation of revenues reflects our two primary products of power sales and natural gas sales, with further disaggregation of power sales provided by geographic region.
The following tables also show the reconciliation of reportable segment revenues and RNF to our total revenues and RNF for the three and nine months ended September 30, 2024 and 2023.
Three Months Ended September 30, 2024
Revenues from external customers
Contracts with customers
Other(a)
TotalIntersegment RevenuesTotal Revenues
Mid-Atlantic$1,504 $97 $1,601 $2 $1,603 
Midwest958 316 1,274 1 1,275 
New York472 39 511 (4)507 
ERCOT307 215 522 1 523 
Other Power Regions1,213 230 1,443 — 1,443 
Total Reportable Segment Power Revenues
4,454 897 5,351 — 5,351 
Total Natural Gas Revenues
184 349 533 — 533 
Total Other Revenues(b)
135 531 666 — 666 
Total Consolidated Operating Revenues$4,773 $1,777 $6,550 $— $6,550 
Three Months Ended September 30, 2023
Revenues from external customers
Contracts with customers
Other(a)
TotalIntersegment RevenuesTotal Revenues
Mid-Atlantic$1,493 $(78)$1,415 $(4)$1,411 
Midwest1,160 (43)1,117 — 1,117 
New York522 (14)508 4 512 
ERCOT489 69 558 1 559 
Other Power Regions1,284 309 1,593 (1)1,592 
Total Reportable Segment Power Revenues
4,948 243 5,191 — 5,191 
Total Natural Gas Revenues
220 385 605 — 605 
Total Other Revenues(b)
145 170 315 — 315 
Total Consolidated Operating Revenues$5,313 $798 $6,111 $— $6,111 
 Nine Months Ended September 30, 2024
Revenues from external customers
 Contracts with customers
Other(a)
TotalIntersegment RevenuesTotal Revenues
Mid-Atlantic$4,154 $(10)$4,144 $4 $4,148 
Midwest2,951 584 3,535 2 3,537 
New York1,428 102 1,530 4 1,534 
ERCOT819 378 1,197 4 1,201 
Other Power Regions 3,673 593 4,266 (14)4,252 
Total Reportable Segment Power Revenues13,025 1,647 14,672 — 14,672 
Total Natural Gas Revenues1,024 1,252 2,276 — 2,276 
Total Other Revenues(b)
389 849 1,238 — 1,238 
Total Consolidated Operating Revenues$14,438 $3,748 $18,186 $— $18,186 
 Nine Months Ended September 30, 2023
Revenues from external customers
 Contracts with customers
Other(a)
TotalIntersegment RevenuesTotal Revenues
Mid-Atlantic$4,140 $(241)$3,899 $(45)$3,854 
Midwest3,707 (231)3,476 3 3,479 
New York1,424 53 1,477 41 1,518 
ERCOT979 73 1,052 4 1,056 
Other Power Regions 3,766 732 4,498 (3)4,495 
Total Reportable Segment Power Revenues14,016 386 14,402 — 14,402 
Total Natural Gas Revenues1,394 1,352 2,746 — 2,746 
Total Other Revenues(b)
435 1,539 1,974 — 1,974 
Total Consolidated Operating Revenues$15,845 $3,277 $19,122 $— $19,122 
__________
(a)Includes revenues from nuclear PTCs beginning in 2024 as well as derivatives and leases in all periods presented.
(b)Represents activities not allocated to a region. See text above for a description of included activities. Includes unrealized mark-to-market gains of $516 million and $177 million for the three months ended September 30, 2024 and 2023, respectively, and unrealized mark-to-market gains of $769 million and $1,317 million for the nine months ended September 30, 2024 and 2023, respectively. See Note 10 — Derivative Financial Instruments for additional information on mark-to-market derivatives.

Three Months Ended September 30, 2024Three Months Ended September 30, 2023
RNF from external customers
Intersegment RNF
Total RNF
RNF from external customers
Intersegment RNF
Total RNF
Mid-Atlantic$806 $3 $809 $747 $(3)$744 
Midwest881 3 884 776 2 778 
New York361 (4)357 311 6 317 
ERCOT404 (1)403 211 (4)207 
Other Power Regions441 (8)433 434 (3)431 
Total RNF for Reportable Segments2,893 (7)2,886 2,479 (2)2,477 
Other(a)
538 7 545 265 2 267 
Total RNF$3,431 $— $3,431 $2,744 $— $2,744 
 Nine Months Ended September 30, 2024Nine Months Ended September 30, 2023
 
RNF from external customers
Intersegment RNF
Total RNF
RNF from external customers
Intersegment RNF
Total RNF
Mid-Atlantic$2,235 $7 $2,242 $2,202 $(44)$2,158 
Midwest2,345 7 2,352 2,439 2 2,441 
New York1,070 4 1,074 851 46 897 
ERCOT836 (10)826 429 (6)423 
Other Power Regions 1,126 (31)1,095 909 (8)901 
Total RNF for Reportable Segments7,612 (23)7,589 6,830 (10)6,820 
Other(a)
1,746 23 1,769 309 10 319 
Total RNF$9,358 $— $9,358 $7,139 $— $7,139 
__________
(a)Other represents activities not allocated to a region. See text above for a description of included activities. See Note 10 — Derivative Financial Instruments for additional information on mark-to-market derivatives.