| 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 | 2026 | 2025 | | | | (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 | | | | Unsecured Term Loan (a) | 4.480% | 250,000 | | 250,000 | | | | KGSS-I Securitized Utility Tariff Bonds | 5.486% | 242,496 | | 257,852 | | | | Unamortized discounts, net of premiums, on long-term debt (b) | | (3,939) | | (3,830) | | | | Debt issuance costs (b) | | (17,636) | | (18,955) | | | | Other | 8.000% | 1,204 | | 1,211 | | | | Total long-term debt, net | | 2,622,125 | | 2,636,278 | | | | Less: current maturities of KGSS-I securitized utility tariff bonds, net | | 31,404 | | 30,566 | | | | Less: current maturities of other long-term debt, net | | 249,918 | | 249,674 | | | | Noncurrent portion of long-term debt, net | | $ | 2,340,803 | | $ | 2,356,038 | | |
(a) Bears interest at a variable rate based on Term SOFR, initially set using the 6-month Term SOFR at closing. The interest rate resets at months six and twelve, each based on the prevailing 6-month Term SOFR and the 1-month Term SOFR, respectively. (b) Includes issuance costs and discounts for the KGSS-I Securitized Utility Tariff Bonds of $4.0 million and $4.3 million, at June 30, 2026 and December 31, 2025, respectively.
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