| Schedule of Line of Credit Facilities |
The following is a summary of our lines of credit as of March 31, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2026 | | December 31, 2025 | | (in thousands) | Borrowing Limit | | Amount Outstanding | | Letters
of Credit | | Amount Available | | Amount Available | | | | | | | | | | | | OTC Credit Agreement | $ | 170,000 | | | $ | — | | | $ | — | | | $ | 170,000 | | | $ | 170,000 | | | OTP Credit Agreement | 220,000 | | | 67,971 | | | 11,514 | | | 140,515 | | | 149,297 | | Total Short-Term Debt | $ | 390,000 | | | $ | 67,971 | | | $ | 11,514 | | | $ | 310,515 | | | $ | 319,297 | |
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| Schedule of Debt |
The following is a summary of outstanding long-term debt by borrower as of March 31, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | | Borrower | | Debt Instrument | | Rate | | Maturity | | March 31,
2026 | | December 31,
2025 | | | | | | | | | | | | | OTC | | Guaranteed Senior Notes | | 3.55 | % | | 12/15/26 | | $ | 80,000 | | | $ | 80,000 | | | OTP | | Series 2007C Senior Unsecured Notes | | 6.37 | % | | 08/02/27 | | 42,000 | | | 42,000 | | | OTP | | Series 2013A Senior Unsecured Notes | | 4.68 | % | | 02/27/29 | | 60,000 | | | 60,000 | | | OTP | | Series 2019A Senior Unsecured Notes | | 3.07 | % | | 10/10/29 | | 10,000 | | | 10,000 | | | OTP | | Series 2020A Senior Unsecured Notes | | 3.22 | % | | 02/25/30 | | 10,000 | | | 10,000 | | | OTP | | Series 2020B Senior Unsecured Notes | | 3.22 | % | | 08/20/30 | | 40,000 | | | 40,000 | | | OTP | | Series 2021A Senior Unsecured Notes | | 2.74 | % | | 11/29/31 | | 40,000 | | | 40,000 | | | OTP | | Series 2024A Senior Unsecured Notes | | 5.48 | % | | 04/01/34 | | 60,000 | | | 60,000 | | | OTP | | Series 2025A Senior Unsecured Notes | | 5.49 | % | | 03/27/35 | | 50,000 | | | 50,000 | | | OTP | | Series 2026A Senior Unsecured Notes | | 5.33 | % | | 03/19/36 | | 100,000 | | | — | | | OTP | | Series 2007D Senior Unsecured Notes | | 6.47 | % | | 08/20/37 | | 50,000 | | | 50,000 | | | OTP | | Series 2019B Senior Unsecured Notes | | 3.52 | % | | 10/10/39 | | 26,000 | | | 26,000 | | | OTP | | Series 2020C Senior Unsecured Notes | | 3.62 | % | | 02/25/40 | | 10,000 | | | 10,000 | | | OTP | | Series 2013B Senior Unsecured Notes | | 5.47 | % | | 02/27/44 | | 90,000 | | | 90,000 | | | OTP | | Series 2018A Senior Unsecured Notes | | 4.07 | % | | 02/07/48 | | 100,000 | | | 100,000 | | | OTP | | Series 2019C Senior Unsecured Notes | | 3.82 | % | | 10/10/49 | | 64,000 | | | 64,000 | | | OTP | | Series 2020D Senior Unsecured Notes | | 3.92 | % | | 02/25/50 | | 15,000 | | | 15,000 | | | OTP | | Series 2021B Senior Unsecured Notes | | 3.69 | % | | 11/29/51 | | 100,000 | | | 100,000 | | | OTP | | Series 2022A Senior Unsecured Notes | | 3.77 | % | | 05/20/52 | | 90,000 | | | 90,000 | | | OTP | | Series 2024B Senior Unsecured Notes | | 5.77 | % | | 04/01/54 | | 60,000 | | | 60,000 | | | OTP | | Series 2025B Senior Unsecured Notes | | 5.98 | % | | 06/05/55 | | 50,000 | | | 50,000 | | Total Long-Term Debt | | | | | | 1,147,000 | | | 1,047,000 | | | Less: | Current Maturities, Net of Unamortized Debt Issuance Costs | | | | | | 79,964 | | | 79,951 | | | Less: | Unamortized Long-Term Debt Issuance Costs | | | | | | 3,872 | | | 3,483 | | | Total Long-Term Debt, Net of Unamortized Debt Issuance Costs | | | | $ | 1,063,164 | | | $ | 963,566 | |
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