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Debt And Financing Arrangements (Tables)

9 Months Ended

Sep. 30, 2025

Details on Long Term Debt

Details on long-term debt at September 30, 2025, September 30, 2024 and December 31, 2024 are shown below.

(millions)		September 30,								December 31,
		2025				2024				2024
Unitil Corporation:
3.70% Senior Notes, Due August 1, 2026		$	30.0			$	30.0			$	30.0
3.43% Senior Notes, Due December 18, 2029			30.0				30.0				30.0
5.99% Senior Notes, Due August 21, 2034			20.0				20.0				20.0
Unitil Energy First Mortgage Bonds:
6.96% Senior Secured Notes, Due September 1, 2028			6.0				8.0				8.0
8.00% Senior Secured Notes, Due May 1, 2031			9.0				10.5				10.5
6.32% Senior Secured Notes, Due September 15, 2036			15.0				15.0				15.0
3.58% Senior Secured Notes, Due September 15, 2040			27.5				27.5				27.5
4.18% Senior Secured Notes, Due November 30, 2048			30.0				30.0				30.0
5.69% Senior Secured Notes, Due August 21, 2054			40.0				40.0				40.0
Fitchburg:
3.52% Senior Notes, Due November 1, 2027			10.0				10.0				10.0
7.37% Senior Notes, Due January 15, 2029			4.8				6.0				6.0
5.90% Senior Notes, Due December 15, 2030			15.0				15.0				15.0
7.98% Senior Notes, Due June 1, 2031			14.0				14.0				14.0
5.70% Senior Notes, Due July 2, 2033			12.0				12.0				12.0
5.54% Senior Notes, Due August 21, 2034			12.5				12.5				12.5
3.78% Senior Notes, Due September 15, 2040			27.5				27.5				27.5
5.99% Senior Notes, Due August 21, 2044			12.5				12.5				12.5
4.32% Senior Notes, Due November 1, 2047			15.0				15.0				15.0
5.96% Senior Notes, Due July 2, 2053			13.0				13.0				13.0
Northern Utilities:
3.52% Senior Notes, Due November 1, 2027			20.0				20.0				20.0
5.54% Senior Notes, Due August 21, 2034			25.0				25.0				25.0
7.72% Senior Notes, Due December 3, 2038			50.0				50.0				50.0
5.74% Senior Notes, Due August 21, 2039			15.0				15.0				15.0
3.78% Senior Notes, Due September 15, 2040			40.0				40.0				40.0
4.42% Senior Notes, Due October 15, 2044			50.0				50.0				50.0
4.32% Senior Notes, Due November 1, 2047			30.0				30.0				30.0
4.04% Senior Notes, Due September 12, 2049			40.0				40.0				40.0
Bangor:
5.70% Senior Notes, Due July 8, 2030			14.0				—				—
6.31% Senior Notes, Due July 8, 2035			18.0				—				—
Granite State:
3.72% Senior Notes, Due November 1, 2027			15.0				15.0				15.0
5.74% Senior Notes, Due August 21, 2034			10.0				10.0				10.0
Unitil Realty Corp.:
2.64% Senior Secured Notes, Due December 18, 2030			3.6				3.8				3.8
Total Long-Term Debt			674.4				647.3				647.3
Less: Unamortized Debt Issuance Costs			3.9				4.0				4.0
Total Long-Term Debt, net of Unamortized Debt Issuance    Costs			670.5				643.3				643.3
Less: Current Portion			34.9				4.9				4.9
Total Long-term Debt, Less Current Portion		$	635.6			$	638.4			$	638.4

Fair Value of Long Term Debt

(millions)		September 30,								December 31,
		2025				2024				2024
Estimated Fair Value of Long-Term Debt		$	626.3			$	617.9			$	598.9

Borrowing Limits Amounts Outstanding and Amounts Available under Credit Facility

		Revolving Credit Facility (millions)
		September 30,								December 31,
		2025				2024				2024
Limit		$	275.0			$	200.0			$	200.0
Short-Term Borrowings Outstanding			117.5				64.3				105.8
Available		$	157.5			$	135.7			$	94.2

Classification of the Company Lease Obligations

The balance sheet classification of the Company’s lease obligations was as follows:

		September 30,								December 31,
Lease Obligations (millions)		2025				2024				2024
Operating Lease Obligations:
Operating Lease Obligations (current portion)		$	1.9			$	1.6			$	1.8
Operating Lease Obligations (long-term portion)			4.9				3.0				4.9
Total Operating Lease Obligations			6.8				4.6				6.7
Capital Lease Obligations:
Other Current Liabilities (current portion)			0.2				0.1				0.1
Other Noncurrent Liabilities (long-term portion)			0.3				0.3				0.4
Total Capital Lease Obligations			0.5				0.4				0.5
Total Lease Obligations		$	7.3			$	5.0			$	7.2

Future Operating Lease Payment Obligations and Future Minimum Lease Payments under Capital Leases

The following table is a schedule of future operating lease payment obligations and future minimum lease payments under capital leases as of September 30, 2025. The payments for operating leases consist of $1.9 million of current Operating Lease Obligations and $4.9 million of noncurrent Operating Lease Obligations on the Company’s Consolidated Balance Sheets as of September 30, 2025. The payments for capital leases consist of $0.2 million of current capital lease obligations, which are included in Other Current Liabilities and $0.3 million of noncurrent capital lease obligations, which are included in Other Noncurrent Liabilities, on the Company’s Consolidated Balance Sheets as of September 30, 2025.

Lease Payments ($000’s)		Operating				Capital
Year Ending December 31,		Leases				Leases
Rest of 2025		$	588			$	45
2026			2,175				186
2027			1,891				163
2028			1,330				78
2029			1,000				54
2030 - 2034			588				16
Total Payments			7,572				542
Less: Interest			777				45
Amount of Lease Obligations Recorded on Consolidated    Balance Sheets		$	6,795			$	497

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