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LONG-TERM DEBT (Notes)
 3 Months Ended
Mar. 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:
Interest Rate
March 31, 2024December 31, 2023
(Thousands of dollars)
Senior Notes due:
February 20243.610%$— $300,000 
March 20241.100%— 473,000 
April 20295.100%300,000 300,000 
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 Notes1,900,000 2,673,000 
KGSS-I Securitized Utility Tariff Bonds5.486%301,503 315,284 
Other8.000%1,235 1,238 
Unamortized discounts on long-term debt(7,487)(7,615)
Debt issuance costs (a)(20,693)(21,092)
Total long-term debt, net2,174,558 2,960,815 
Less: current maturities of securitized utility tariff bonds, net28,183 27,430 
Less: current maturities of other long-term debt, net13 772,984 
Noncurrent portion of long-term debt, net$2,146,362 $2,160,401 
(a) Includes issuance costs for the KGSS-I Securitized Utility Tariff Bonds of $5.2 million and $5.3 million, at March 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 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.

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.
Securitized Utility Tariff Bonds - The KGSS-I Securitized Utility Tariff Bonds are governed by an indenture between KGSS-I and the indenture trustee. The indenture contains certain covenants that restrict KGSS-I’s ability to sell, transfer, convey, exchange, or otherwise dispose of its assets. KGSS-I’s assets cannot be used to settle ONE Gas’ obligations and the holders of the Securitized Utility Tariff Bonds have no recourse against ONE Gas. See Note 14 for additional discussion of the Kansas securitization transaction.