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Segments and Related Information | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Segment Information | 14. Segments and Related Information Regulated electric utility operating results of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS, as well as the regulated natural gas utility operating results of NSP-Minnesota, NSP-Wisconsin and PSCo are each separately and regularly reviewed by Xcel Energy’s chief operating decision maker. Xcel Energy evaluates performance by each utility subsidiary based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment. Xcel Energy has the following reportable segments:
• | Regulated Electric - The regulated electric utility segment generates, transmits and distributes electricity in Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. The regulated electric utility segment also includes wholesale commodity and trading operations.
• | Regulated Natural Gas - The regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.
• | All Other - Operating segments with revenues below the necessary quantitative thresholds are included in this category. Those segments primarily include steam revenue, appliance repair services, non-utility real estate activities, revenues associated with processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits.
Xcel Energy had equity investments in unconsolidated subsidiaries of $141 million and $140 million as of Dec. 31, 2018 and 2017, respectively, included in the natural gas utility and all other segments. Asset and capital expenditure information is not provided for Xcel Energy’s reportable segments. As an integrated electric and natural gas utility, Xcel Energy operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis. Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising. Xcel Energy’s segment information:
(Millions of Dollars) |  | 2018 |  | 2017 |  | 2016
Regulated Electric |  |  |  |  |  |
Operating revenues from external customers |  | $ | 9,719 |  |  | $ | 9,676 |  |  | $ | 9,500 |
Intersegment revenue |  | 1 |  |  | 2 |  |  | 1 |
Total revenues |  | $ | 9,720 |  |  | $ | 9,678 |  |  | $ | 9,501 |
Depreciation and amortization |  | 1,421 |  |  | 1,298 |  |  | 1,136 |
Interest charges and financing costs |  | 449 |  |  | 449 |  |  | 450 |
Income tax expense |  | 187 |  |  | 528 |  |  | 567 |
Net income |  | 1,177 |  |  | 1,066 |  |  | 1,067 |
Regulated Natural Gas |  |  |  |  |  |
Operating revenues from external customers |  | $ | 1,739 |  |  | $ | 1,650 |  |  | $ | 1,531 |
Intersegment revenue |  | 2 |  |  | 1 |  |  | 1 |
Total revenues |  | $ | 1,741 |  |  | $ | 1,651 |  |  | $ | 1,532 |
Depreciation and amortization |  | 212 |  |  | 174 |  |  | 160 |
Interest charges and financing costs |  | 61 |  |  | 57 |  |  | 54 |
Income tax expense |  | 28 |  |  | 23 |  |  | 76 |
Net income |  | 187 |  |  | 182 |  |  | 124 |
All Other |  |  |  |  |  |
Total operating revenue |  | $ | 79 |  |  | $ | 78 |  |  | $ | 76 |
Depreciation and amortization |  | 9 |  |  | 7 |  |  | 7 |
Interest charges and financing costs |  | 142 |  |  | 122 |  |  | 116 |
Income tax (benefit) |  | (34 | ) |  | (9 | ) |  | (62 | )
Net (loss) |  | (103 | ) |  | (100 | ) |  | (68 | )
Consolidated Total |  |  |  |  |  |
Total revenue |  | $ | 11,540 |  |  | $ | 11,407 |  |  | $ | 11,109 |
Reconciling eliminations |  | (3 | ) |  | (3 | ) |  | (2 | )
Consolidated total revenue |  | $ | 11,537 |  |  | $ | 11,404 |  |  | $ | 11,107 |
Depreciation and amortization |  | 1,642 |  |  | 1,479 |  |  | 1,303 |
Interest charges and financing costs |  | 652 |  |  | 628 |  |  | 620 |
Income tax expense |  | 181 |  |  | 542 |  |  | 581 |
Net income |  | 1,261 |  |  | 1,148 |  |  | 1,123 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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