v3.26.1
Segment Information (Tables)
 6 Months Ended
Jun. 30, 2026
Segment Reporting [Abstract]  
Schedule Of Segment Reporting Information By Segment
The following tables present revenues, specified items reflected in net income attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2026 and 2025. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount. For additional information about our segments, see Note 16 – Segment Information under Part II, Item 8, of the Form 10-K.
Ameren
Reportable Segments
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Three Months 2026:
External revenues$1,111 $629 $176 $176 $— $— $2,092 
Intersegment revenues13 — — 53 — (66)— 
Revenue1,124 629 176 229 — (66)2,092 
Fuel and purchased power(a)
(318)(238)— — — 49 (507)
Natural gas purchased for resale(a)
(7)— (32)— — — (39)
Other operations and maintenance expenses(a)
(282)(165)(67)(21)(3)17 (521)
Other segment items
Depreciation and amortization(234)(98)(33)(52)(3)— (420)
Taxes other than income taxes(101)(21)(17)(3)(4)— (146)
Other income (expense), net60 18 4 6 33 (3)118 
Interest charges(83)(28)(17)(32)(52)3 (209)
Income taxes (benefit)(1)(26)(5)(31)11 — (52)
Noncontrolling interests – preferred stock dividends(1)(1)— — — — (2)
Net income (loss) attributable to Ameren common shareholders$157 $70 $9 $96 $(18)$— $314 
Interest income$2 $5 $— $— $3 $(3)$7 
Capital expenditures680 180 58 166 2 (7)1,079 
Three Months 2025:
External revenues$1,332 $570 $158 $161 $— $— $2,221 
Intersegment revenues8 3 — 47 — (58)— 
Revenue1,340 573 158 208 — (58)2,221 
Fuel and purchased power(a)
(614)(223)— — — 43 (794)
Natural gas purchased for resale(a)
(9)— (30)— — — (39)
Other operations and maintenance expenses(a)
(238)(156)(55)(18)(8)15 (460)
Other segment items
Depreciation and amortization(209)(93)(33)(49)(2)— (386)
Taxes other than income taxes(89)(20)(16)(3)(3)— (131)
Other income (expense), net47 23 5 10 12 (1)96 
Interest charges(70)(26)(16)(29)(47)1 (187)
Income taxes (benefit)(7)(13)(3)(33)13 — (43)
Noncontrolling interests – preferred stock dividends(1)(1)— — — — (2)
Net income (loss) attributable to Ameren common shareholders$150 $64 $10 $86 
(b)
$(35)$— $275 
Interest income$2 $8 $— $— $1 $(1)$10 
Capital expenditures667 153 88 158 3 (3)1,066 
Reportable Segments
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionOtherIntersegment EliminationsAmeren
Six Months 2026:
External revenues$2,031 $1,272 $612 $353 $— $— $4,268 
Intersegment revenues23 — — 103 — (126)— 
Revenue2,054 1,272 612 456 — (126)4,268 
Fuel and purchased power(a)
(532)(504)— — — 96 (940)
Natural gas purchased for resale(a)
(41)— (169)— — — (210)
Other operations and maintenance expenses(a)
(546)(325)(124)(40)(7)30 (1,012)
Other segment items
Depreciation and amortization(448)(194)(67)(105)(4)— (818)
Taxes other than income taxes(196)(43)(46)(5)(7)— (297)
Other income (expense), net113 37 7 13 42 (4)208 
Interest charges(165)(56)(33)(62)(101)4 (413)
Income (taxes) benefit(4)(50)(49)(63)54 — (112)
Noncontrolling interests – preferred stock dividends(2)(1)— — — — (3)
Net income (loss) attributable to Ameren common shareholders$233 $136 $131 $194 $(23)$— $671 
Interest income$5 $11 $— $— $4 $(4)$16 
Capital expenditures1,771 376 130 370 3 3 2,653 
Six Months 2025:
External revenues$2,282 $1,140 $569 $327 $— $— $4,318 
Intersegment revenues15 5 — 91 — (111)— 
Revenue2,297 1,145 569 418 — (111)4,318 
Fuel and purchased power(a)
(944)(435)— — — 83 (1,296)
Natural gas purchased for resale(a)
(39)— (169)— — — (208)
Other operations and maintenance expenses(a)
(488)(322)(110)(37)(16)28 (945)
Other segment items
Depreciation and amortization(403)(184)(65)(97)(4)— (753)
Taxes other than income taxes(178)(41)(45)(4)(7)— (275)
Other income (expense), net90 46 10 17 20 (2)181 
Interest charges(130)(52)(31)(58)(93)2 (362)
Income (taxes) benefit(11)(29)(41)(64)52 — (93)
Noncontrolling interests – preferred stock dividends(2)(1)— — — — (3)
Net income (loss) attributable to Ameren common shareholders$192 $127 $118 $175 
(b)
$(48)$— $564 
Interest income$4 $16 $— $1 $2 $(2)$21 
Capital expenditures1,325 320 147 331 5 2 2,130 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
(b)Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent)
Ameren Illinois
Reportable Segments
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2026:
External revenues$629 $176 $123 $— $928 
Intersegment revenues— — 45 (45)— 
Revenue629 176 168 (45)928 
Purchased power(a)
(238)— — 45 (193)
Natural gas purchased for resale(a)
— (32)— — (32)
Other operations and maintenance expenses(a)
(165)(67)(16)— (248)
Other segment items
Depreciation and amortization(98)(33)(41)— (172)
Taxes other than income taxes(21)(17)(1)— (39)
Other income, net18 4 4 — 26 
Interest charges(28)(17)(24)— (69)
Income taxes(26)(5)(22)— (53)
Noncontrolling interests – preferred stock dividends(1)— — — (1)
Net income available to common shareholder70 9 68 — 147 
Interest income5 — — — 5 
Capital expenditures180 58 80 — 318 
Three Months 2025:
External revenues$573 $158 $112 $— $843 
Intersegment revenues— — 40 (40)— 
Revenue573 158 152 (40)843 
Purchased power(a)
(223)— — 40 (183)
Natural gas purchased for resale(a)
— (30)— — (30)
Other operations and maintenance expenses(a)
(156)(55)(14)— (225)
Other segment items
Depreciation and amortization(93)(33)(37)— (163)
Taxes other than income taxes(20)(16)(1)— (37)
Other income, net23 5 9 — 37 
Interest charges(26)(16)(21)— (63)
Income taxes(13)(3)(25)— (41)
Noncontrolling interests – preferred stock dividends(1)— — — (1)
Net income available to common shareholder64 10 63 — 137 
Interest income8 — — — 8 
Capital expenditures153 88 138 — 379 
Reportable Segments
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Six Months 2026:
External revenues$1,272 $612 $243 $— $2,127 
Intersegment revenues— — 89 (89)— 
Revenue1,272 612 332 (89)2,127 
Purchased power(a)
(504)— — 89 (415)
Natural gas purchased for resale(a)
— (169)— — (169)
Other operations and maintenance expenses(a)
(325)(124)(31)— (480)
Other segment items
Depreciation and amortization(194)(67)(81)— (342)
Taxes other than income taxes(43)(46)(2)— (91)
Other income, net37 7 11 — 55 
Interest charges(56)(33)(48)— (137)
Income taxes(50)(49)(45)— (144)
Noncontrolling interests – preferred stock dividends(1)— — — (1)
Net income available to common shareholder$136 $131 $136 $— $403 
Interest income$11 $— $— $— $11 
Capital expenditures376 130 200 — 706 
Six Months 2025:
External revenues$1,145 $569 $229 $— $1,943 
Intersegment revenues— — 77 (77)— 
Revenue1,145 569 306 (77)1,943 
Purchased power(a)
(435)— — 77 (358)
Natural gas purchased for resale(a)
— (169)— — (169)
Other operations and maintenance expenses(a)
(322)(110)(29)— (461)
Other segment items
Depreciation and amortization(184)(65)(73)— (322)
Taxes other than income taxes(41)(45)(2)— (88)
Other income, net46 10 15 — 71 
Interest charges(52)(31)(42)— (125)
Income taxes(29)(41)(47)— (117)
Noncontrolling interests – preferred stock dividends(1)— — — (1)
Net income available to common shareholder$127 $118 $128 $— $373 
Interest income$16 $— $1 $— $17 
Capital expenditures320 147 275 — 742 
(a)Significant segment expense that is regularly provided to the CODMs. Intersegment expenses are included within the amounts shown.
Disaggregation of Revenue
The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and six months ended June 30, 2026 and 2025. Economic factors affect the nature, timing, amount, and uncertainty of revenues and cash flows in a similar manner across customer classes. Revenues from alternative revenue programs have a similar distribution among customer classes as revenues from contracts with customers. Other revenues not associated with contracts with customers are presented in the Other customer classification, along with electric transmission, off-system sales, and capacity revenues.
Ameren
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2026:
Residential$426 $350 $— $— $— $776 
Commercial381 198 — — — 579 
Industrial94 52 — — — 146 
Other193 29 
(a)
— 229 (65)386 
Total electric revenues$1,094 $629 $— $229 $(65)$1,887 
Residential$16 $— $113 $— $— $129 
Commercial7 — 29 — — 36 
Industrial1 — 2 — — 3 
Other6 — 32 — (1)37 
Total natural gas revenues$30 $— $176 $— $(1)$205 
Total revenues(b)
$1,124 $629 $176 $229 $(66)$2,092 
Three Months 2025:
Residential$405 $321 $— $— $— $726 
Commercial344 181 — — — 525 
Industrial84 48 — — — 132 
Other482 23 
(a)
— 208 (58)655 

Total electric revenues$1,315 $573 $— $208 $(58)$2,038 
Residential$13 $— $107 $— $— $120 
Commercial5 — 28 — — 33 
Industrial1 — 3 — — 4 
Other6 — 20 — — 26 
Total natural gas revenues$25 $— $158 $— $— $183 
Total revenues(b)
$1,340 $573 $158 $208 $(58)$2,221 
Six Months 2026:
Residential$825 $699 $— $— $— $1,524 
Commercial683 393 — — — 1,076 
Industrial166 107 — — — 273 
Other271 73 
(a)
— 456 (125)675 
Total electric revenues$1,945 $1,272 $— $456 $(125)$3,548 
Residential$64 $— $425 $— $— $489 
Commercial27 — 115 — — 142 
Industrial3 — 8 — — 11 
Other15 — 64 — (1)78 
Total natural gas revenues$109 $— $612 $— $(1)$720 
Total revenues(b)
$2,054 $1,272 $612 $456 $(126)$4,268 
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Six Months 2025:
Residential$781 $663 $— $— $— $1,444 
Commercial617 361 — — — 978 
Industrial150 98 — — — 248 
Other660 23 
(a)
— 418 (111)990 
Total electric revenues$2,208 $1,145 $— $418 $(111)$3,660 
Residential$56 $— $416 $— $— $472 
Commercial24 — 105 — — 129 
Industrial3 — 7 — — 10 
Other6 — 41 — — 47 
Total natural gas revenues$89 $— $569 $— $— $658 
Total revenues(b)
$2,297 $1,145 $569 $418 $(111)$4,318 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and six months ended June 30, 2026 and 2025:
Ameren MissouriAmeren Illinois Electric DistributionAmeren Illinois Natural GasAmeren TransmissionIntersegment EliminationsAmeren
Three Months 2026:
Revenues from alternative revenue programs$— $26 $10 $(3)$— $33 
Other revenues not from contracts with customers2 2 1 — (2)3 
Three Months 2025:
Revenues from alternative revenue programs$1 $(8)$1 $(8)$— $(14)
Other revenues not from contracts with customers2 5 1 — (4)4 
Six Months 2026:
Revenues from alternative revenue programs$(3)$72 $27 $(7)$— $89 
Other revenues not from contracts with customers4 5 2 — (2)9 
Six Months 2025:
Revenues from alternative revenue programs$(4)$13 $4 $(9)$— $4 
Other revenues not from contracts with customers3 8 2 — (4)9 
Ameren Illinois
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionIntersegment EliminationsAmeren Illinois
Three Months 2026:
Residential$350 $113 $— $— $463 
Commercial198 29 — — 227 
Industrial52 2 — — 54 
Other29 
(a)
32 168 (45)184 
Total revenues(b)
$629 $176 $168 $(45)$928 
Three Months 2025:
Residential$321 $107 $— $— $428 
Commercial181 28 — — 209 
Industrial48 3 — — 51 
Other23 
(a)
20 152 (40)155 
Total revenues(b)
$573 $158 $152 $(40)$843 
Six Months 2026:
Residential$699 $425 $— $— $1,124 
Commercial393 115 — — 508 
Industrial107 8 — — 115 
Other73 
(a)
64 332 (89)380 
Total revenues(b)
$1,272 $612 $332 $(89)$2,127 
Six Months 2025:
Residential$663 $416 $— $— $1,079 
Commercial361 105 — — 466 
Industrial98 7 — — 105 
Other23 
(a)
41 306 (77)293 
Total revenues(b)
$1,145 $569 $306 $(77)$1,943 
(a)Includes over-recoveries of various riders.
(b)The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and six months ended June 30, 2026 and 2025:
Ameren Illinois Electric DistributionAmeren Illinois Natural GasAmeren Illinois TransmissionAmeren Illinois
Three Months 2026:
Revenues from alternative revenue programs$26 $10 $(3)$33 
Other revenues not from contracts with customers2 1 — 3 
Three Months 2025:
Revenues from alternative revenue programs$(8)$1 $(7)$(14)
Other revenues not from contracts with customers5 1 — 6 
Six Months 2026:
Revenues from alternative revenue programs$72 $27 $(6)$93 
Other revenues not from contracts with customers5 2 — 7 
Six Months 2025:
Revenues from alternative revenue programs$13 $4 $(8)$9 
Other revenues not from contracts with customers8 2 — 10