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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - TEXAS-NEW MEXICO POWER COMPANY AND SUBSIDIARIES - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash Flows From Operating Activities:    
Net earnings $ 251,396 $ 175,114
Adjustments to reconcile net earnings to net cash flows from operating activities:    
Depreciation and amortization 379,835 361,095
Deferred income tax expense 37,342 19,901
Allowance for equity funds used during construction and other, net (17,284) (11,319)
Changes in certain assets and liabilities:    
Accounts receivable and unbilled revenues (94,175) (76,923)
Materials and supplies (20,100) (6,125)
Other current assets (76,017) (13,584)
Other assets (61,557) (27,568)
Accounts payable (7,402) 3,007
Accrued interest and taxes 32,078 28,770
Other current liabilities 24,906 (2,620)
Other liabilities 496 2,053
Net cash flows from operating activities 452,533 426,790
Cash Flows From Investing Activities:    
Utility plant additions (903,010) (886,111)
Net cash flows used in investing activities (908,067) (890,520)
Cash Flows From Financing Activities:    
Short-term borrowings 2,912,050 1,910,600
Repayments of short-term borrowings (2,857,450) (2,206,100)
Long-term borrowings 945,000 3,153,600
Repayment of long-term debt (602,303) (2,990,507)
Transmission interconnection and security deposit arrangements 152,889 33,936
Refunds paid under transmission interconnection and security deposit arrangements (65,021) (102,811)
Debt issuance costs and other, net (7,234) (17,590)
Net cash flows from financing activities 458,262 481,629
Change in Cash, Cash Equivalents, and Restricted Cash 2,728 17,899
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 31,953 22,085
Cash, Cash Equivalents, and Restricted Cash at End of Period 34,681 39,984
Supplemental Cash Flow Disclosures:    
Interest paid, net of amounts capitalized 189,934 161,677
Income taxes paid, net 2,048 2,350
Supplemental schedule of noncash investing activities:    
Decrease (increase) in accrued plant additions 43,844 53,059
Texas-New Mexico Power Company    
Cash Flows From Operating Activities:    
Net earnings 124,653 84,381
Adjustments to reconcile net earnings to net cash flows from operating activities:    
Depreciation and amortization 114,998 114,648
Deferred income tax expense 26,018 11,779
Allowance for equity funds used during construction and other, net (9,202) (5,539)
Changes in certain assets and liabilities:    
Accounts receivable and unbilled revenues (26,378) (23,284)
Materials and supplies (21,977) (6,239)
Other current assets (54,350) (10,908)
Other assets (19,037) (8,711)
Accounts payable 950 3,985
Accrued interest and taxes 4,533 5,757
Other current liabilities 7,432 13,330
Other liabilities (878) 14,130
Net cash flows from operating activities 146,762 193,329
Cash Flows From Investing Activities:    
Utility plant additions (369,202) (400,769)
Net cash flows used in investing activities (369,202) (400,769)
Cash Flows From Financing Activities:    
Short-term borrowings 741,400 349,600
Repayments of short-term borrowings (741,400) (501,200)
Long-term borrowings 150,000 2,308,600
Repayment of long-term debt 0 (2,168,600)
Equity contribution from parent 0 250,000
Transmission interconnection and security deposit arrangements 124,061 22,450
Refunds paid under transmission interconnection and security deposit arrangements (42,321) (20,750)
Debt issuance costs and other, net (2,351) (11,141)
Net cash flows from financing activities 229,389 228,959
Change in Cash, Cash Equivalents, and Restricted Cash 6,949 21,519
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 15,251 233
Cash, Cash Equivalents, and Restricted Cash at End of Period 22,200 21,752
Supplemental Cash Flow Disclosures:    
Interest paid, net of amounts capitalized 60,766 48,477
Income taxes paid, net 2,048 2,350
Supplemental schedule of noncash investing activities:    
Decrease (increase) in accrued plant additions $ 24,738 $ 38,519