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Short-Term and Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Long-term Debt

Long-Term Debt
As of December 31			2024			2023
Millions
First Mortgage Bonds
3.69% Series Due 2024			—			$60.0
4.90% Series Due 2025			$30.0			30.0
5.10% Series Due 2025			30.0			30.0
3.20% Series Due 2026			75.0			75.0
5.99% Series Due 2027			60.0			60.0
3.30% Series Due 2028			40.0			40.0
4.08% Series Due 2029			70.0			70.0
3.74% Series Due 2029			50.0			50.0
2.50% Series Due 2030			46.0			46.0
3.86% Series Due 2030			60.0			60.0
2.79% Series Due 2031			100.0			100.0
4.54% Series Due 2032			75.0			75.0
4.98% Series Due 2033			125.0			125.0
5.69% Series Due 2036			50.0			50.0
5.72% Series Due 2039			100.0			—
6.00% Series Due 2040			35.0			35.0
5.82% Series Due 2040			45.0			45.0
4.08% Series Due 2042			85.0			85.0
4.21% Series Due 2043			60.0			60.0
4.95% Series Due 2044			40.0			40.0
5.05% Series Due 2044			40.0			40.0
4.39% Series Due 2044			50.0			50.0
4.07% Series Due 2048			60.0			60.0
4.47% Series Due 2049			30.0			30.0
3.30% Series Due 2050			94.0			94.0
Armenia Mountain Senior Secured Notes 3.26% Due 2024			—			9.5
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006, Due 2025			27.8			27.8
Revolving Credit Facility Variable Rate Due 2027			20.0			—
Senior Unsecured Notes 2.65% Due 2025			—			150.0
Senior Unsecured Notes 3.11% Due 2027			80.0			80.0
Senior Unsecured Notes 5.94% Due 2029			100.0			—
Senior Unsecured Notes 6.18% Due 2034			50.0			—
SWL&P First Mortgage Bonds 4.15% Series Due 2028			15.0			15.0
SWL&P First Mortgage Bonds 4.14% Series Due 2048			12.0			12.0
Other Long-Term Debt, 2024 Weighted Average Rate 4.47% Due 2025 – 2051			53.2			95.1
Unamortized Debt Issuance Costs			(8.6)			(8.1)
Total Long-Term Debt			1,799.4			1,791.3
Less: Due Within One Year			94.7			111.4
Net Long-Term Debt			$1,704.7			$1,679.9

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- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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