| Schedule of Long-Term Debt Instruments |
The table below presents a summary of our long-term debt outstanding for the periods indicated:
| | | | | | | | | | | | | | June 30, | December 31, | | Interest Rate | 2025 | 2024 | | | (Thousands of dollars) | | Senior Notes due: | | | | | April 2029 | 5.100% | $ | 550,000 | | $ | 550,000 | | | May 2030 | 2.000% | 300,000 | | 300,000 | | | September 2032 | 4.250% | 300,000 | | 300,000 | | | February 2044 | 4.658% | 600,000 | | 600,000 | | | November 2048 | 4.500% | 400,000 | | 400,000 | | | Total Senior Notes | | 2,150,000 | | 2,150,000 | | | KGSS-I Securitized Utility Tariff Bonds | 5.486% | 272,798 | | 287,345 | | | Unamortized discounts, net of premiums, on long-term debt | | (3,725) | | (3,624) | | | Debt issuance costs (a) | | (19,664) | | (20,691) | | | Other | 8.000% | 1,218 | | 1,226 | | | Total long-term debt, net | | 2,400,627 | | 2,414,256 | | | Less: current maturities of KGSS-I securitized utility tariff bonds, net | | 29,750 | | 28,956 | | | Less: current maturities of other long-term debt, net | | 14 | | 14 | | | Noncurrent portion of long-term debt, net | | $ | 2,370,863 | | $ | 2,385,286 | |
(a) Includes issuance costs and discounts for the KGSS-I Securitized Utility Tariff Bonds of $4.5 million and $4.8 million, at June 30, 2025 and December 31, 2024, respectively.
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