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VARIABLE INTEREST ENTITES (Tables)
12 Months Ended
Dec. 31, 2025
Variable Interest Entity [Line Items]  
Schedule of Finite-Lived Intangible Assets
The following table summarizes the amortization expense related to the securitized intangible asset expected to be recognized in our consolidated statements of income:

December 31,
Future amortization expense related to securitized intangible asset2025
(Thousands of dollars)
2026$30,271 
202731,996 
202833,818 
202935,740 
203037,770 
Thereafter64,191 
 Total amortization expense$233,786 
Kansas Gas Service Securitization I LLC  
Variable Interest Entity [Line Items]  
Schedule of Variable Interest Entities
The following table summarizes the impact of KGSS-I on our consolidated balance sheets:

December 31,
20252024
(Thousands of dollars)
Restricted cash and cash equivalents$23,107 $20,542 
Accounts receivable4,463 4,659 
Securitized intangible asset, net233,786 265,951 
Total assets$261,356 $291,152 
Current maturities of securitized utility tariff bonds, net of issuance costs30,566 28,956 
Accounts payable136 319 
Accrued interest5,894 6,568 
Securitized utility tariff bonds, excluding current maturities, net of discounts and issuance costs $4.3 million and $4.8 million, as of December 31, 2025 and December 31, 2024, respectively
223,020 253,568 
Paid-in capital 1,680 1,681 
Retained earnings60 60 
Total liabilities and equity$261,356 $291,152 

The following table summarizes the impact of KGSS-I on our consolidated statements of income:

Year Ended December 31,
202520242023
(Thousands of dollars)
Operating revenues$47,446 $44,390 $48,677 
Operating expense(442)(443)(440)
Amortization expense(32,164)(27,668)(30,219)
Interest income551 671 696 
Interest expense(15,246)(16,806)(18,552)
 Income before income taxes145 144 162 
Income taxes (26)26 
 Net income$145 $118 $188