| (In millions) | Membership Interest | Undistributed (Losses)/Gains | Total Member's Equity |
|---|
| Balance at December 31, 2022 | $11,582 | $(352) | $11,230 |
|---|
| Net income | — | 590 | 590 |
|---|
| Distribution to member | — | (513) | (513) |
|---|
| Contributions from member | 475 | — | 475 |
|---|
| Balance at December 31, 2023 | $12,057 | $(275) | $11,782 |
|---|
| Net income | — | 741 | 741 |
|---|
| Distribution to member | — | (706) | (706) |
|---|
| Contributions from member | 505 | — | 505 |
|---|
| Balance at December 31, 2024 | $12,562 | $(240) | $12,322 |
|---|
| Net income | — | 799 | 799 |
|---|
| Distribution to member | — | (710) | (710) |
|---|
| Contributions from member | 568 | — | 568 |
|---|
| Balance at December 31, 2025 | $13,130 | $(151) | $12,979 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Operating revenues |
|---|
| Electric operating revenues | $3,497 | $3,017 | $2,793 |
|---|
| Revenues from alternative revenue programs | (49) | 15 | 22 |
|---|
| Operating revenues from affiliates | 6 | 7 | 9 |
|---|
| Total operating revenues | 3,454 | 3,039 | 2,824 |
|---|
| Operating expenses |
|---|
| Purchased power | 1,262 | 1,055 | 974 |
|---|
| Operating and maintenance | 379 | 283 | 336 |
|---|
| Operating and maintenance from affiliates | 246 | 251 | 236 |
|---|
| Depreciation and amortization | 433 | 407 | 441 |
|---|
| Taxes other than income taxes | 455 | 424 | 390 |
|---|
| Total operating expenses | 2,775 | 2,420 | 2,377 |
|---|
| Gain (loss) on sales of assets | 1 | (1) | 9 |
|---|
| Operating income | 680 | 618 | 456 |
|---|
| Other income and (deductions) |
|---|
| Interest expense, net | (214) | (195) | (165) |
|---|
| Interest income from affiliates, net | — | 3 | — |
|---|
| Other, net | 41 | 54 | 66 |
|---|
| Total other income and (deductions) | (173) | (138) | (99) |
|---|
| Income before income taxes | 507 | 480 | 357 |
|---|
| Income taxes | 106 | 90 | 51 |
|---|
| Net income | $401 | $390 | $306 |
|---|
| Comprehensive income | $401 | $390 | $306 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Cash flows from operating activities |
|---|
| Net income | $401 | $390 | $306 |
|---|
| Adjustments to reconcile net income to net cash flows provided by operating activities: |
|---|
| Depreciation, amortization, and accretion | 435 | 407 | 441 |
|---|
| (Gain) loss on sales of assets | (1) | 1 | (9) |
|---|
| Deferred income taxes and amortization of investment tax credits | 51 | 24 | (15) |
|---|
| Other non-cash operating activities | 111 | 33 | 53 |
|---|
| Changes in assets and liabilities: |
|---|
| Accounts receivable | (121) | (26) | (29) |
|---|
| Receivables from and payables to affiliates, net | 4 | 6 | (3) |
|---|
| Inventories | (4) | (10) | (24) |
|---|
| Accounts payable and accrued expenses | 1 | 67 | 6 |
|---|
| Collateral received (paid), net | 12 | — | (25) |
|---|
| Income taxes | (33) | (30) | 60 |
|---|
| Regulatory assets and liabilities, net | (93) | (85) | (45) |
|---|
| Pension and non-pension postretirement benefit contributions | (9) | (9) | (12) |
|---|
| Other assets and liabilities | (29) | (84) | (5) |
|---|
| Net cash flows provided by operating activities | 725 | 684 | 699 |
|---|
| Cash flows from investing activities |
|---|
| Capital expenditures | (957) | (929) | (957) |
|---|
| Proceeds from sale of long-lived assets | 2 | — | 10 |
|---|
| Other investing activities | — | — | 8 |
|---|
| Net cash flows used in investing activities | (955) | (929) | (939) |
|---|
| Cash flows from financing activities |
|---|
| Changes in short-term borrowings | 103 | 68 | (167) |
|---|
| Issuance of long-term debt | 275 | 675 | 350 |
|---|
| Retirement of long-term debt | — | (400) | — |
|---|
| Dividends paid on common stock | (327) | (359) | (252) |
|---|
| Contributions from parent | 193 | 260 | 308 |
|---|
| Other financing activities | (10) | (20) | (26) |
|---|
| Net cash flows provided by financing activities | 234 | 224 | 213 |
|---|
| Increase (decrease) in cash, restricted cash, and cash equivalents | 4 | (21) | (27) |
|---|
| Cash, restricted cash, and cash equivalents at beginning of period | 51 | 72 | 99 |
|---|
| Cash, restricted cash, and cash equivalents at end of period | $55 | $51 | $72 |
|---|
| Supplemental cash flow information |
|---|
| Increase (decrease) in capital expenditures not paid | $56 | $30 | $(55) |
|---|
| December 31, |
|---|
| (In millions) | 2025 | 2024 |
|---|
| ASSETS |
|---|
| Current assets |
|---|
| Cash and cash equivalents | $22 | $30 |
|---|
| Restricted cash and cash equivalents | 33 | 21 |
|---|
| Accounts receivable |
|---|
| Customer accounts receivable | 484 | 395 |
|---|
| Customer allowance for credit losses | (69) | (59) |
|---|
| Customer accounts receivable, net | 415 | 336 |
|---|
| Other accounts receivable | 154 | 142 |
|---|
| Other allowance for credit losses | (26) | (27) |
|---|
| Other accounts receivable, net | 128 | 115 |
|---|
| Receivables from affiliates | — | 1 |
|---|
| Inventories, net | 174 | 169 |
|---|
| Regulatory assets | 182 | 157 |
|---|
| Prepaid renewable energy credits | 171 | 165 |
|---|
| Other | 59 | 55 |
|---|
| Total current assets | 1,184 | 1,049 |
|---|
| Property, plant, and equipment (net of accumulated depreciation and amortization of $4,784 and $4,522 as of December 31, 2025 and 2024, respectively) | 10,747 | 10,097 |
|---|
| Deferred debits and other assets |
|---|
| Regulatory assets | 405 | 446 |
|---|
| Investments | 141 | 135 |
|---|
| Prepaid pension asset | 194 | 222 |
|---|
| Other | 57 | 51 |
|---|
| Total deferred debits and other assets | 797 | 854 |
|---|
| Total assets | $12,728 | $12,000 |
|---|
| December 31, |
|---|
| (In millions) | 2025 | 2024 |
|---|
| LIABILITIES AND SHAREHOLDER'S EQUITY |
|---|
| Current liabilities |
|---|
| Short-term borrowings | $303 | $200 |
|---|
| Long-term debt due within one year | 6 | 6 |
|---|
| Accounts payable | 418 | 360 |
|---|
| Accrued expenses | 173 | 201 |
|---|
| Payables to affiliates | 37 | 37 |
|---|
| Customer deposits | 61 | 55 |
|---|
| Regulatory liabilities | 13 | 17 |
|---|
| Merger related obligation | 20 | 22 |
|---|
| Renewable energy credit obligations | 174 | 169 |
|---|
| Other | 64 | 51 |
|---|
| Total current liabilities | 1,269 | 1,118 |
|---|
| Long-term debt | 4,626 | 4,356 |
|---|
| Deferred credits and other liabilities |
|---|
| Deferred income taxes and unamortized investment tax credits | 1,604 | 1,509 |
|---|
| Regulatory liabilities | 268 | 310 |
|---|
| Asset retirement obligations | 45 | 49 |
|---|
| Other | 214 | 223 |
|---|
| Total deferred credits and other liabilities | 2,131 | 2,091 |
|---|
| Total liabilities | 8,026 | 7,565 |
|---|
| Commitments and contingencies |
|---|
| Shareholder's equity |
|---|
| Common stock ($0.01 par value, 200 shares authorized, 0 shares(a) outstanding as of December 31, 2025 and 2024) | 3,528 | 3,335 |
|---|
| Retained earnings | 1,174 | 1,100 |
|---|
| Total shareholder's equity | 4,702 | 4,435 |
|---|
| Total liabilities and shareholder's equity | $12,728 | $12,000 |
|---|
(a)In millions, shares round to zero. Number of shares is 100 outstanding as of December 31, 2025 and 2024.
| (In millions) | Common Stock | Retained Earnings | Total Shareholder's Equity |
|---|
| Balance at December 31, 2022 | $2,767 | $1,015 | $3,782 |
|---|
| Net income | — | 306 | 306 |
|---|
| Common stock dividends | — | (252) | (252) |
|---|
| Contributions from parent | 308 | — | 308 |
|---|
| Balance at December 31, 2023 | $3,075 | $1,069 | $4,144 |
|---|
| Net income | — | 390 | 390 |
|---|
| Common stock dividends | — | (359) | (359) |
|---|
| Contributions from parent | 260 | — | 260 |
|---|
| Balance at December 31, 2024 | $3,335 | $1,100 | $4,435 |
|---|
| Net income | — | 401 | 401 |
|---|
| Common stock dividends | — | (327) | (327) |
|---|
| Contributions from parent | 193 | — | 193 |
|---|
| Balance at December 31, 2025 | $3,528 | $1,174 | $4,702 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Operating revenues |
|---|
| Electric operating revenues | $1,747 | $1,602 | $1,460 |
|---|
| Natural gas operating revenues | 231 | 180 | 205 |
|---|
| Revenues from alternative revenue programs | (16) | (2) | 15 |
|---|
| Operating revenues from affiliates | 9 | 7 | 8 |
|---|
| Total operating revenues | 1,971 | 1,787 | 1,688 |
|---|
| Operating expenses |
|---|
| Purchased power | 766 | 694 | 639 |
|---|
| Purchased fuel | 95 | 66 | 98 |
|---|
| Operating and maintenance | 213 | 196 | 193 |
|---|
| Operating and maintenance from affiliates | 178 | 181 | 171 |
|---|
| Depreciation and amortization | 252 | 245 | 244 |
|---|
| Taxes other than income taxes | 88 | 79 | 75 |
|---|
| Total operating expenses | 1,592 | 1,461 | 1,420 |
|---|
| Operating income | 379 | 326 | 268 |
|---|
| Other income and (deductions) |
|---|
| Interest expense, net | (102) | (94) | (74) |
|---|
| Interest income from affiliates, net | — | 1 | — |
|---|
| Other, net | 16 | 25 | 18 |
|---|
| Total other income and (deductions) | (86) | (68) | (56) |
|---|
| Income before income taxes | 293 | 258 | 212 |
|---|
| Income taxes | 69 | 49 | 35 |
|---|
| Net income | $224 | $209 | $177 |
|---|
| Comprehensive income | $224 | $209 | $177 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Cash flows from operating activities |
|---|
| Net income | $224 | $209 | $177 |
|---|
| Adjustments to reconcile net income to net cash flows provided by operating activities: |
|---|
| Depreciation and amortization | 252 | 245 | 244 |
|---|
| Deferred income taxes and amortization of investment tax credits | 32 | 16 | 4 |
|---|
| Other non-cash operating activities | 57 | 40 | 13 |
|---|
| Changes in assets and liabilities: |
|---|
| Accounts receivable | (70) | (46) | 6 |
|---|
| Receivables from and payables to affiliates, net | (3) | 2 | 2 |
|---|
| Inventories | (14) | (20) | (5) |
|---|
| Accounts payable and accrued expenses | 20 | 22 | (7) |
|---|
| Collateral received (paid), net | 2 | 2 | (121) |
|---|
| Income taxes | 16 | (24) | 26 |
|---|
| Regulatory assets and liabilities, net | (35) | (51) | 25 |
|---|
| Pension and non-pension postretirement benefit contributions | (1) | (3) | (4) |
|---|
| Other assets and liabilities | 6 | 16 | 13 |
|---|
| Net cash flows provided by operating activities | 486 | 408 | 373 |
|---|
| Cash flows from investing activities |
|---|
| Capital expenditures | (534) | (556) | (562) |
|---|
| Net cash flows used in investing activities | (534) | (556) | (562) |
|---|
| Cash flows from financing activities |
|---|
| Changes in short-term borrowings | 17 | 81 | (52) |
|---|
| Issuance of long-term debt | 125 | 175 | 650 |
|---|
| Retirement of long-term debt | — | (33) | (500) |
|---|
| Dividends paid on common stock | (202) | (220) | (133) |
|---|
| Contributions from parent | 107 | 160 | 99 |
|---|
| Other financing activities | (10) | (8) | (11) |
|---|
| Net cash flows provided by financing activities | 37 | 155 | 53 |
|---|
| (Decrease) increase in cash, restricted cash, and cash equivalents | (11) | 7 | (136) |
|---|
| Cash, restricted cash, and cash equivalents at beginning of period | 23 | 16 | 152 |
|---|
| Cash, restricted cash, and cash equivalents at end of period | $12 | $23 | $16 |
|---|
| Supplemental cash flow information |
|---|
| Increase (decrease) in capital expenditures not paid | $13 | $41 | $(6) |
|---|
| December 31, |
|---|
| (In millions) | 2025 | 2024 |
|---|
| ASSETS |
|---|
| Current assets |
|---|
| Cash and cash equivalents | $9 | $21 |
|---|
| Restricted cash and cash equivalents | 3 | 2 |
|---|
| Accounts receivable |
|---|
| Customer accounts receivable | 253 | 210 |
|---|
| Customer allowance for credit losses | (19) | (17) |
|---|
| Customer accounts receivable, net | 234 | 193 |
|---|
| Other accounts receivable | 75 | 63 |
|---|
| Other allowance for credit losses | (10) | (9) |
|---|
| Other accounts receivable, net | 65 | 54 |
|---|
| Receivables from affiliates | 2 | — |
|---|
| Inventories, net |
|---|
| Fossil fuel | 9 | 6 |
|---|
| Materials and supplies | 107 | 95 |
|---|
| Prepaid utility taxes | 29 | 26 |
|---|
| Regulatory assets | 72 | 60 |
|---|
| Prepaid renewable energy credits | 30 | 29 |
|---|
| Other | 13 | 16 |
|---|
| Total current assets | 573 | 502 |
|---|
| Property, plant, and equipment, (net of accumulated depreciation and amortization of $2,241 and $2,075 as of December 31, 2025 and 2024, respectively) | 5,855 | 5,540 |
|---|
| Deferred debits and other assets |
|---|
| Regulatory assets | 214 | 215 |
|---|
| Other | 147 | 164 |
|---|
| Total deferred debits and other assets | 361 | 379 |
|---|
| Total assets | $6,789 | $6,421 |
|---|
| December 31, |
|---|
| (In millions) | 2025 | 2024 |
|---|
| LIABILITIES AND SHAREHOLDER'S EQUITY |
|---|
| Current liabilities |
|---|
| Short-term borrowings | $161 | $144 |
|---|
| Long-term debt due within one year | 53 | 130 |
|---|
| Accounts payable | 218 | 187 |
|---|
| Accrued expenses | 70 | 55 |
|---|
| Payables to affiliates | 25 | 26 |
|---|
| Customer deposits | 36 | 34 |
|---|
| Regulatory liabilities | 42 | 42 |
|---|
| Renewable energy credit obligations | 49 | 48 |
|---|
| Other | 22 | 22 |
|---|
| Total current liabilities | 676 | 688 |
|---|
| Long-term debt | 2,291 | 2,090 |
|---|
| Deferred credits and other liabilities |
|---|
| Deferred income taxes and unamortized investment tax credits | 996 | 946 |
|---|
| Regulatory liabilities | 316 | 325 |
|---|
| Asset retirement obligations | 12 | 13 |
|---|
| Other | 127 | 117 |
|---|
| Total deferred credits and other liabilities | 1,451 | 1,401 |
|---|
| Total liabilities | 4,418 | 4,179 |
|---|
| Commitments and contingencies |
|---|
| Shareholder's equity |
|---|
| Common stock ($2.25 par value, 0 shares(a) authorized, 0 shares(a) outstanding as of December 31, 2025 and 2024, respectively) | 1,722 | 1,615 |
|---|
| Retained earnings | 649 | 627 |
|---|
| Total shareholder's equity | 2,371 | 2,242 |
|---|
| Total liabilities and shareholder's equity | $6,789 | $6,421 |
|---|
(a)In millions, shares round to zero. Number of shares is 1,000 authorized and outstanding as of December 31, 2025 and 2024.
| (In millions) | Common Stock | Retained Earnings | Total Shareholder's Equity |
|---|
| Balance at December 31, 2022 | $1,356 | $594 | $1,950 |
|---|
| Net income | — | 177 | 177 |
|---|
| Common stock dividends | — | (133) | (133) |
|---|
| Contributions from parent | 99 | — | 99 |
|---|
| Balance at December 31, 2023 | $1,455 | $638 | $2,093 |
|---|
| Net income | — | 209 | 209 |
|---|
| Common stock dividends | — | (220) | (220) |
|---|
| Contributions from parent | 160 | — | 160 |
|---|
| Balance at December 31, 2024 | $1,615 | $627 | $2,242 |
|---|
| Net income | — | 224 | 224 |
|---|
| Common stock dividends | — | (202) | (202) |
|---|
| Contributions from parent | 107 | — | 107 |
|---|
| Balance at December 31, 2025 | $1,722 | $649 | $2,371 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Operating revenues |
|---|
| Electric operating revenues | $1,712 | $1,638 | $1,493 |
|---|
| Revenues from alternative revenue programs | 2 | (12) | 27 |
|---|
| Operating revenues from affiliates | 4 | 2 | 2 |
|---|
| Total operating revenues | 1,718 | 1,628 | 1,522 |
|---|
| Operating expenses |
|---|
| Purchased power | 808 | 698 | 637 |
|---|
| Operating and maintenance | 173 | 206 | 233 |
|---|
| Operating and maintenance from affiliates | 155 | 162 | 153 |
|---|
| Depreciation and amortization | 248 | 278 | 283 |
|---|
| Taxes other than income taxes | 9 | 9 | 8 |
|---|
| Total operating expenses | 1,393 | 1,353 | 1,314 |
|---|
| Gain on sale of assets | 2 | — | — |
|---|
| Operating income | 327 | 275 | 208 |
|---|
| Other income and (deductions) |
|---|
| Interest expense, net | (82) | (74) | (72) |
|---|
| Interest expense to affiliates, net | — | (5) | — |
|---|
| Other, net | 10 | 14 | 20 |
|---|
| Total other income and (deductions) | (72) | (65) | (52) |
|---|
| Income before income taxes | 255 | 210 | 156 |
|---|
| Income taxes | 67 | 55 | 36 |
|---|
| Net income | $188 | $155 | $120 |
|---|
| Comprehensive income | $188 | $155 | $120 |
|---|
| For the Years Ended December 31, |
|---|
| (In millions) | 2025 | 2024 | 2023 |
|---|
| Cash flows from operating activities |
|---|
| Net income | $188 | $155 | $120 |
|---|
| Adjustments to reconcile net income to net cash flows provided by operating activities: |
|---|
| Depreciation and amortization | 248 | 278 | 283 |
|---|
| Gain on sales of assets | (2) | — | — |
|---|
| Deferred income taxes and amortization of investment tax credits | 47 | 39 | 27 |
|---|
| Other non-cash operating activities | 38 | 70 | — |
|---|
| Changes in assets and liabilities: |
|---|
| Accounts receivable | (14) | (35) | (57) |
|---|
| Receivables from and payables to affiliates, net | (3) | (8) | (4) |
|---|
| Inventories | (13) | (8) | (12) |
|---|
| Accounts payable and accrued expenses | (8) | (18) | 27 |
|---|
| Collateral received (paid), net | 5 | — | (50) |
|---|
| Income taxes | 9 | (5) | — |
|---|
| Regulatory assets and liabilities, net | (62) | (88) | (47) |
|---|
| Pension and non-pension postretirement benefit contributions | (4) | (9) | (3) |
|---|
| Other assets and liabilities | (1) | (44) | (83) |
|---|
| Net cash flows provided by operating activities | 428 | 327 | 201 |
|---|
| Cash flows from investing activities |
|---|
| Capital expenditures | (390) | (373) | (460) |
|---|
| Proceeds from sale of long-lived assets | 2 | — | — |
|---|
| Net cash flows used in investing activities | (388) | (373) | (460) |
|---|
| Cash flows from financing activities |
|---|
| Changes in short-term borrowings | (38) | (13) | 199 |
|---|
| Issuance of long-term debt | 250 | 250 | 75 |
|---|
| Retirement of long-term debt | (150) | (150) | — |
|---|
| Dividends paid on common stock | (183) | (127) | (126) |
|---|
| Contributions from parent | 98 | 85 | 65 |
|---|
| Other financing activities | (7) | (6) | (5) |
|---|
| Net cash flows (used in) provided by financing activities | (30) | 39 | 208 |
|---|
| Increase (decrease) in cash, restricted cash, and cash equivalents | 10 | (7) | (51) |
|---|
| Cash, restricted cash, and cash equivalents at beginning of period | 14 | 21 | 72 |
|---|
| Cash, restricted cash, and cash equivalents at end of period | $24 | $14 | $21 |
|---|
| Supplemental cash flow information |
|---|
| Increase (decrease) in capital expenditures not paid | $11 | $4 | $(47) |
|---|