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DEBT AND FINANCING ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2016

Details on Long Term Debt

Details on long-term debt at September 30, 2016, September 30, 2015 and December 31, 2015 are shown below:

($ millions)		September 30,								December 31,
		2016				2015				2015
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				—				—
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			12.0				15.0				12.0
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			11.4				15.2				11.4
7.37% Notes, Due January 15, 2029			12.0				12.0				12.0
7.98% Notes, Due June 1, 2031			14.0				14.0				14.0
6.79% Notes, Due October 15, 2025			10.0				10.0				10.0
5.90% Notes, Due December 15, 2030			15.0				15.0				15.0
Northern Utilities Senior Notes:
6.95% Senior Notes, Series A, Due December 3, 2018			30.0				30.0				30.0
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			10.0				10.0				10.0
Unitil Realty Corp.:
Senior Secured Notes:
8.00% Notes, Due Through August 1, 2017			0.6				1.3				1.1
Total Long-Term Debt			355.0				332.5				325.5
Less: Unamortized Debt Issuance Costs			3.0				3.0				2.9
Total Long-Term Debt, net of Unamortized Debt Issuance Costs			352.0				329.5				322.6
Less: Current Portion			17.0				3.8				17.1
Total Long-term Debt, Less Current Portion		$	335.0			$	325.7			$	305.5

Fair Value of Long Term Debt

($ millions)		September 30,								December 31,
		2016				2015				2015
Estimated Fair Value of Long-Term Debt		$	405.8			$	356.7			$	345.2

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 September 30, 2016, September 30, 2015 and December 31, 2015:

		Revolving Credit Facility ($ millions)
		September 30,								December 31,
		2016				2015				2015
Limit		$	120.0			$	120.0			$	120.0
Short-Term Borrowings Outstanding		$	36.9			$	4.1			$	42.0
Letters of Credit Outstanding		$	1.1			$	—			$	—
Available		$	82.0			$	115.9			$	78.0

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