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DEBT AND FINANCING ARRANGEMENTS (Tables)

6 Months Ended

Jun. 30, 2018

Details on Long Term Debt

Details on long-term debt at June 30, 2018, June 30, 2017 and December 31, 2017 are shown below:

($ millions)		June 30,								December 31,
		2018				2017				2017
Unitil Corporation:
6.33% Senior Notes, Due May 1, 2022		$	20.0			$	20.0			$	20.0
3.70% Senior Notes, Due August 1, 2026			30.0				30.0				30.0
Unitil Energy First Mortgage Bonds:
5.24% Senior Secured Notes, Due March 2, 2020			10.0				15.0				15.0
8.49% Senior Secured Notes, Due October 14, 2024			7.5				9.0				7.5
6.96% Senior Secured Notes, Due September 1, 2028			20.0				20.0				20.0
8.00% Senior Secured Notes, Due May 1, 2031			15.0				15.0				15.0
6.32% Senior Secured Notes, Due September 15, 2036			15.0				15.0				15.0
Fitchburg:
6.75% Senior Notes, Due November 30, 2023			7.6				9.5				7.6
6.79% Senior Notes, Due October 15, 2025			10.0				10.0				10.0
3.52% Senior Notes, Due November 1, 2027			10.0				—				10.0
7.37% Senior Notes, Due January 15, 2029			12.0				12.0				12.0
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
4.32% Senior Notes, Due November 1, 2047			15.0				—				15.0
Northern Utilities:
6.95% Senior Notes, Due December 3, 2018			10.0				20.0				10.0
5.29% Senior Notes, Due March 2, 2020			16.6				25.0				25.0
3.52% Senior Notes, Due November 1, 2027			20.0				—				20.0
7.72% Senior Notes, Due December 3, 2038			50.0				50.0				50.0
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
Granite State:
7.15% Senior Notes, Due December 15, 2018			3.3				6.7				3.3
3.72% Senior Notes, Due November 1, 2027			15.0				—				15.0
Total Long-Term Debt			396.0				336.2				409.4
Less: Unamortized Debt Issuance Costs			3.2				2.8				3.3
Total Long-Term Debt, net of Unamortized Debt Issuance Costs			392.8				333.4				406.1
Less: Current Portion			29.7				29.9				29.8
Total Long-term Debt, Less Current Portion		$	363.1			$	303.5			$	376.3

Fair Value of Long Term Debt

($ millions)		June 30,								December 31,
		2018				2017				2017
Estimated Fair Value of Long-Term Debt		$	420.5			$	381.5			$	457.1

Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility

The following table details the borrowing limits, amounts outstanding and amounts available under the Credit Facility as of June 30, 2018, June 30, 2017 and December 31, 2017:

		Revolving Credit Facility ($ millions)
		June 30,								December 31,
		2018				2017				2017
Limit		$	120.0			$	120.0			$	120.0
Short-Term Borrowings Outstanding		$	37.4			$	79.2			$	38.3
Letters of Credit Outstanding		$	0.0			$	1.1			$	0.0
Available		$	82.6			$	39.7			$	81.7

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