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DEBT AND FINANCING ARRANGEMENTS (Tables)

3 Months Ended

Mar. 31, 2017

Details on Long Term Debt

Details on long-term debt at March 31, 2017, March 31, 2016 and December 31, 2016 are shown below:

($ millions)		March 31,								December 31,
		2017				2016				2016
Unitil Corporation Senior Notes:
6.33% Notes, Due May 1, 2022		$	20.0			$	20.0			$	20.0
3.70% Notes, Due August 1, 2026			30.0				—				30.0
Unitil Energy Systems, Inc.:
First Mortgage Bonds:
5.24% Series, Due March 2, 2020			15.0				15.0				15.0
8.49% Series, Due October 14, 2024			9.0				12.0				9.0
6.96% Series, Due September 1, 2028			20.0				20.0				20.0
8.00% Series, Due May 1, 2031			15.0				15.0				15.0
6.32% Series, Due September 15, 2036			15.0				15.0				15.0
Fitchburg Gas and Electric Light Company:
Long-Term Notes:
6.75% Notes, Due November 30, 2023			9.5				11.4				9.5
6.79% Notes, Due October 15, 2025			10.0				10.0				10.0
7.37% Notes, Due January 15, 2029			12.0				12.0				12.0
5.90% Notes, Due December 15, 2030			15.0				15.0				15.0
7.98% Notes, Due June 1, 2031			14.0				14.0				14.0
Northern Utilities Senior Notes:
6.95% Senior Notes, Series A, Due December 3, 2018			20.0				30.0				20.0
5.29% Senior Notes, Due March 2, 2020			25.0				25.0				25.0
7.72% Senior Notes, Series B, Due December 3, 2038			50.0				50.0				50.0
4.42% Senior Notes, Due October 15, 2044			50.0				50.0				50.0
Granite State Senior Notes:
7.15% Senior Notes, Due December 15, 2018			6.7				10.0				6.7
Unitil Realty Corp.:
Senior Secured Notes:
8.00% Notes, Due Through August 1, 2017			0.2				0.9				0.4
Total Long-Term Debt			336.4				325.3				336.6
Less: Unamortized Debt Issuance Costs			2.9				2.8				3.0
Total Long-Term Debt, net of Unamortized Debt Issuance Costs			333.5				322.5				333.6
Less: Current Portion			30.0				17.1				16.8
Total Long-term Debt, Less Current Portion		$	303.5			$	305.4			$	316.8

Fair Value of Long Term Debt

($ millions)		March 31,								December 31,
		2017				2016				2016
Estimated Fair Value of Long-Term Debt		$	374.3			$	355.7			$	370.3

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 revolving Credit Facility as of March 31, 2017, March 31, 2016 and December 31, 2016:

		Revolving Credit Facility ($ millions)
		March 31,								December 31,
		2017				2016				2016
Limit		$	120.0			$	120.0			$	120.0
Short-Term Borrowings Outstanding		$	76.6			$	47.9			$	81.9
Letters of Credit Outstanding		$	1.1			$	—			$	1.1
Available		$	42.3			$	72.1			$	37.0

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