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Segment Information | 12 Months Ended
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Dec. 31, 2020
Segment Information | Note 3: Segment Information Unitil reports three segments : utility gas operations , utility electric operations and non-regulated. Unitil’s principal business is the local distribution of electricity in the southeastern seacoast and state capital regions of New Hampshire and the greater Fitchburg area of north central Massachusetts and the local distribution of natural gas in southeastern New Hampshire, portions of southern Maine to the Lewiston-Auburn area and in the greater Fitchburg area of north central Massachusetts. Unitil has three distribution utility subsidiaries, Unitil Energy, which operates in New Hampshire, Fitchburg, which operates in Massachusetts and Northern Utilities, which operates in New Hampshire and Maine. Granite State is an interstate natural gas transmission pipeline company, operating 86 miles of underground gas transmission pipeline primarily located in Maine and New Hampshire. Granite State provides Northern Utilities with interconnection to three major natural gas pipelines and access to domestic natural gas supplies in the south and Canadian natural gas supplies in the north. Granite State derives its revenues principally from the transmission services provided to Northern Utilities and, to a lesser extent, third-party marketers. Granite State is included in the utility gas operations segment. Unitil Resources is the Company’s wholly-owned non-regulated subsidiary. Usource, Inc. and Usource L.L.C. (collectively, Usource), which the Company divested of in the first quarter of 2019, were wholly-owned subsidiaries of Unitil Resources. Usource provided brokering and advisory services to large commercial and industrial customers in the northeastern United States. Unitil Realty and Unitil Service provide centralized facilities, operations and administrative services to support the affiliated Unitil companies. Unitil Resources and Usource are included in the Non-Regulated segment. Unitil Realty, Unitil Service and the holding company are included in Other. Unitil Service provides centralized management and administrative services, including information systems management and financial record keeping. Unitil Realty owns certain real estate, principally the Company’s corporate headquarters. The earnings of the holding company are principally derived from income earned on short-term investments and real property owned for Unitil and its subsidiaries’ use. The segments follow the same accounting policies as described in the Summary of Significant Accounting Policies. Intersegment sales take place at cost and the effects of all intersegment and/or intercompany transactions are eliminated in the consolidated financial statements. Segment profit or loss is based on profit or loss from operations after income taxes and preferred stock dividends. Expenses used to determine operating income before taxes are charged directly to each segment or are allocated based on cost allocation factors included in rate applications approved by the FERC, NHPUC, MDPU, and MPUC. Assets allocated to each segment are based upon specific identification of such assets provided by Company records. The following tables provide significant segment financial data for the years ended December 31, 2020, 2019 and 2018 (millions):
Year Ended December 31, 2020 |  | Gas |  |  | Electric |  |  | Non- Regulated |  |  | Other |  |  | Total |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 185.2 |  |  | $ | 226.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 411.9 |
Rate Adjustment Mechanism Revenue |  |  | 6.2 |  |  |  | 0.5 |  |  |  | — |  |  |  | — |  |  |  | 6.7 |
Total Operating Revenues |  |  | 191.4 |  |  |  | 227.2 |  |  |  | — |  |  |  | — |  |  |  | 418.6 |
Interest Income |  |  | 1.1 |  |  |  | 1.1 |  |  |  | — |  |  |  | 0.4 |  |  |  | 2.6 |
Interest Expense |  |  | 14.2 |  |  |  | 8.7 |  |  |  | — |  |  |  | 3.5 |  |  |  | 26.4 |
Depreciation & Amortization Expense |  |  | 29.8 |  |  |  | 23.8 |  |  |  | — |  |  |  | 0.9 |  |  |  | 54.5 |
Income Tax Expense (Benefit) |  |  | 7.3 |  |  |  | 4.7 |  |  |  | — |  |  |  | (1.8 | ) |  |  | 10.2 |
Segment Profit |  |  | 19.3 |  |  |  | 12.9 |  |  |  | — |  |  |  | — |  |  |  | 32.2 |
Segment Assets |  |  | 886.3 |  |  |  | 571.8 |  |  |  | — |  |  |  | 19.8 |  |  |  | 1,477.9 |
Capital Expenditures |  |  | 71.1 |  |  |  | 45.5 |  |  |  | — |  |  |  | 6.0 |  |  |  | 122.6 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 212.1 |  |  | $ | 223.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 435.2 |
Rate Adjustment Mechanism Revenue |  |  | (8.7 | ) |  |  | 10.8 |  |  |  | — |  |  |  | — |  |  |  | 2.1 |
Other Operating Revenue— Non-Regulated |  |  | — |  |  |  | — |  |  |  | 0.9 |  |  |  | — |  |  |  | 0.9 |
Total Operating Revenues |  |  | 203.4 |  |  |  | 233.9 |  |  |  | 0.9 |  |  |  | — |  |  |  | 438.2 |
Interest Income |  |  | 1.2 |  |  |  | 0.9 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 2.9 |
Interest Expense |  |  | 14.4 |  |  |  | 9.4 |  |  |  | — |  |  |  | 2.8 |  |  |  | 26.6 |
Depreciation & Amortization Expense |  |  | 28.5 |  |  |  | 22.6 |  |  |  | — |  |  |  | 0.9 |  |  |  | 52.0 |
Income Tax Expense (Benefit) |  |  | 7.2 |  |  |  | 4.2 |  |  |  | 3.8 |  |  |  | (1.4 | ) |  |  | 13.8 |
Segment Profit |  |  | 19.1 |  |  |  | 11.5 |  |  |  | 10.2 |  |  |  | 3.4 |  |  |  | 44.2 |
Segment Assets |  |  | 823.3 |  |  |  | 529.3 |  |  |  | 0.3 |  |  |  | 17.9 |  |  |  | 1,370.8 |
Capital Expenditures |  |  | 74.0 |  |  |  | 39.6 |  |  |  | — |  |  |  | 5.6 |  |  |  | 119.2 |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billed and Unbilled Revenue |  | $ | 210.7 |  |  | $ | 228.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 439.4 |
Rate Adjustment Mechanism Revenue |  |  | 5.4 |  |  |  | (5.4 | ) |  |  | — |  |  |  | — |  |  |  | — |
Other Operating Revenue— Non-Regulated |  |  | — |  |  |  | — |  |  |  | 4.7 |  |  |  | — |  |  |  | 4.7 |
Total Operating Revenues |  |  | 216.1 |  |  |  | 223.3 |  |  |  | 4.7 |  |  |  | — |  |  |  | 444.1 |
Interest Income |  |  | 0.8 |  |  |  | 0.8 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 2.4 |
Interest Expense |  |  | 14.2 |  |  |  | 9.0 |  |  |  | — |  |  |  | 3.2 |  |  |  | 26.4 |
Depreciation & Amortization Expense |  |  | 24.9 |  |  |  | 23.1 |  |  |  | 0.1 |  |  |  | 2.3 |  |  |  | 50.4 |
Income Tax Expense (Benefit) |  |  | 7.1 |  |  |  | 4.2 |  |  |  | 0.5 |  |  |  | (3.4 | ) |  |  | 8.4 |
Segment Profit |  |  | 18.8 |  |  |  | 11.4 |  |  |  | 1.3 |  |  |  | 1.5 |  |  |  | 33.0 |
Segment Assets |  |  | 764.1 |  |  |  | 484.2 |  |  |  | 6.9 |  |  |  | 43.1 |  |  |  | 1,298.3 |
Capital Expenditures |  |  | 70.8 |  |  |  | 28.4 |  |  |  | — |  |  |  | 3.2 |  |  |  | 102.4 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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