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LONG-TERM DEBT (Notes)
 12 Months Ended
Dec. 31, 2024
Long-Term Debt, Unclassified [Abstract]  
Long-term Debt [Text Block] LONG-TERM DEBT
The table below presents a summary of our long-term debt outstanding for the periods indicated:

December 31,
Interest Rate
20242023
(Thousands of dollars)
Senior Notes due:
February 20243.610%$— $300,000 
March 20241.100%— 473,000 
April 20295.100%550,000 300,000 
May 20302.000%300,000 300,000 
September 20324.250%300,000 300,000 
February 20444.658%600,000 600,000 
November 20484.500%400,000 400,000 
Total Senior Notes2,150,000 2,673,000 
KGSS-I Securitized Utility Tariff Bonds5.486%287,345 315,284 
Unamortized discounts, net of premiums, on long-term debt(3,624)(7,615)
Debt issuance costs (a)(20,691)(21,092)
Other8.000%1,226 1,238 
Total long-term debt, net2,414,256 2,960,815 
Less: current maturities of KGSS-I securitized utility tariff bonds, net28,956 27,430 
Less: current maturities of other long-term debt, net14 772,984 
Noncurrent portion of long-term debt, net$2,385,286 $2,160,401 
(a) Includes issuance costs and discounts for the KGSS-I Securitized Utility Tariff Bonds of $4.8 million and $5.3 million, at December 31, 2024 and December 31, 2023 respectively.
Senior Notes - The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in aggregate principal amount of the outstanding Senior Notes to declare those Senior Notes immediately due and payable in full.

Depending on the series, we may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months or six months before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective Senior Note plus accrued and unpaid interest to the redemption date. Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.

In December 2023, we issued $300 million of 5.10 percent senior notes due April 2029. The proceeds from the issuance were used to repay amounts outstanding under our commercial paper program and for general corporate purposes.

We repaid our $300 million of 3.61 percent senior notes due February 2024 and our $473 million of 1.10 percent senior notes due March 2024 upon maturity with commercial paper.

In August 2024, we reopened our outstanding 5.10 percent senior notes due 2029 and issued an additional $250 million. After the completion of this offering, the aggregate principal amount of the outstanding 5.10 percent senior notes due 2029 is $550 million.