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Consolidated Statements of Earnings - TNMP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Electric Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Operating Expenses:      
Administrative and general 247,116 227,900 227,149
Regulatory disallowances 8,980 71,923 832
Depreciation and amortization 384,925 319,503 304,853
Transmission and distribution costs 98,380 98,721 94,684
Taxes other than income taxes 100,580 95,940 92,989
Total operating expenses 1,517,713 1,707,858 1,855,795
Operating income 453,486 231,340 393,760
Other Income and Deductions:      
Other income 28,621 24,204 21,601
Other (deductions) (24,189) (15,869) (13,881)
Net other income and (deductions) 54,820 49,544 (54,542)
Interest Charges 228,066 190,355 127,908
Earnings before Income Taxes 280,240 90,529 211,310
Income Taxes 21,518 (16,350) 26,130
TNMP      
Electric Operating Revenues 592,111 535,250 482,730
Operating Expenses:      
Cost of energy and production costs 149,066 138,647 123,928
Administrative and general 54,711 53,963 49,592
Regulatory disallowances 0 1,173 0
Depreciation and amortization 125,915 113,142 98,316
Transmission and distribution costs 37,078 36,996 36,406
Taxes other than income taxes 44,441 41,311 38,521
Total operating expenses 411,211 385,232 346,763
Operating income 180,900 150,018 135,967
Other Income and Deductions:      
Other income 12,305 10,127 10,641
Other (deductions) (3,580) (1,759) (1,988)
Net other income and (deductions) 8,725 8,368 8,653
Interest Charges 58,983 46,152 37,192
Earnings before Income Taxes 130,642 112,234 107,428
Income Taxes 27,114 17,297 15,161
Net earnings $ 103,528 $ 94,937 $ 92,267