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Long-Term Debt, Credit Arrangements and Guarantees (Tables) | 6 Months Ended
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Jun. 30, 2013
Details on Long Term Debt | Details on long-term debt at June 30, 2013, June 30, 2012 and December 31, 2012 are shown below ($ Millions):
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2012 |
Unitil Corporation Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
6.33% Notes, Due May 1, 2022 |  | $ | 20.0 |  |  | $ | 20.0 |  |  | $ | 20.0 |
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 |  |  | 15.0 |  |  |  | 15.0 |  |  |  | 15.0 |
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 |  |  | 19.0 |  |  |  | 19.0 |  |  |  | 19.0 |
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, Inc.: |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes: |  |  |  |  |  |  |  |  |  |  |  |
6.95% Senior Notes, 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, Due December 3, 2038 |  |  | 50.0 |  |  |  | 50.0 |  |  |  | 50.0 |
Granite State Gas Transmission, Inc.: |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 2.6 |  |  |  | 3.1 |  |  |  | 2.8 |
Total Long-Term Debt |  |  | 287.6 |  |  |  | 288.1 |  |  |  | 287.8 |
Less: Current Portion |  |  | 0.6 |  |  |  | 0.5 |  |  |  | 0.5 |
Total Long-term Debt, Less Current Portion |  | $ | 287.0 |  |  | $ | 287.6 |  |  | $ | 287.3 |
Fair Value of Long Term Debt |
(Millions) |  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2012 |
Estimated Fair Value of Long-Term Debt |  | $ | 333.2 |  |  | $ | 341.6 |  |  | $ | 349.7 |
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 June 30, 2013, June 30, 2012 and December 31, 2012:
|  | Revolving Credit Facility (millions) |
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2012 |
Limit |  | $ | 60.0 |  |  | $ | 115.0 |  |  | $ | 60.0 |
Outstanding |  | $ | 24.5 |  |  | $ | 5.0 |  |  | $ | 49.4 |
Available |  | $ | 35.5 |  |  | $ | 110.0 |  |  | $ | 10.6 |

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