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Segment Information | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Segment Information | Segment Information - MGE Energy and MGE. The electric utility business purchases, generates and distributes electricity, and contracts for transmission service. The gas utility business purchases and distributes natural gas and contracts for the transportation of natural gas. Both the electric and gas segments operate through MGE Energy's principal subsidiary, MGE. The nonregulated energy operations are conducted through MGE Energy's subsidiaries: MGE Power, MGE Power Elm Road, and MGE Power West Campus. These subsidiaries own electric generating capacity that they lease to MGE to assist MGE. MGE Power Elm Road has an ownership interest in two coal-fired generating units in Oak Creek, Wisconsin, which are leased to MGE, and MGE Power West Campus owns a controlling interest in the electric generation plant of a natural gas-fired cogeneration facility on the UW campus. MGE Power West Campus's portion is also leased to MGE. The transmission investment segment invests in ATC, a company that provides electric transmission services primarily in Wisconsin, and ATC Holdco, a company formed to pursue electric transmission development and investments outside of Wisconsin. These investments are held in MGE Transco and MGEE Transco, respectively. See Footnote 7 for further discussion. The "All Others" segment includes: corporate, CWDC, MAGAEL, MGE State Energy Services, MGE Services, NGV Fueling Services (dissolved in 2018), and North Mendota. These entities' operations consist of investing in companies and property which relate to the regulated operations, financing the regulated operations, or, in the case of NGV Fueling Services, owning and operating natural gas compression equipment. General corporate expenses include the cost of executive management, corporate accounting and finance, information technology, risk management, human resources and legal functions, and employee benefits that are allocated to electric and gas segments based on formulas prescribed by the PSCW. Identifiable assets are those used in MGE's operations in each segment. Sales between our electric and gas segments are based on PSCW approved tariffed rates. Additionally, intersegment operations related to the leasing arrangement between our electric segment and MGE Power Elm Road/MGE Power West Campus are based on terms previously approved by the PSCW. Consistent with internal reporting, management has presented the direct financing capital leases between MGE and MGE Power Elm Road/MGE Power West Campus based on actual lease payments included in rates. Lease payments made by MGE to MGE Power Elm Road and MGE Power West Campus are shown as operating expenses. The lease payments received by MGE Power Elm Road and MGE Power West Campus from MGE are shown as lease income in interdepartmental revenues. The depreciation expense associated with the Elm Road Units and WCCF is reflected in the nonregulated energy segment. The following table shows segment information for MGE Energy's and MGE's operations:
(In thousands) MGE Energy |  | Electric |  | Gas |  | Non-Regulated Energy |  | Transmission Investment |  | All Others |  | Consolidation/ Elimination Entries |  | Consolidated Total
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ | 408,285 | $ | 159,875 | $ | 695 | $ | - | $ | - | $ | - | $ | 568,855
Interdepartmental revenues |  | 806 |  | 16,070 |  | 40,020 |  | - |  | - |  | (56,896) |  | -
Total operating revenues |  | 409,091 |  | 175,945 |  | 40,715 |  | - |  | - |  | (56,896) |  | 568,855
Depreciation and amortization |  | (52,755) |  | (11,320) |  | (7,487) |  | - |  | - |  | - |  | (71,562)
Other operating expenses |  | (297,156) |  | (145,097) |  | (144) |  | - |  | (882) |  | 56,896 |  | (386,383)
Operating income (loss) |  | 59,180 |  | 19,528 |  | 33,084 |  | - |  | (882) |  | - |  | 110,910
Other income (deductions), net |  | 7,153 |  | 3,550 |  | - |  | 9,547 |  | (1,439) |  | - |  | 18,811
Interest (expense) income, net |  | (14,978) |  | (4,237) |  | (5,083) |  | - |  | 1,235 |  | - |  | (23,063)
Income (loss) before taxes |  | 51,355 |  | 18,841 |  | 28,001 |  | 9,547 |  | (1,086) |  | - |  | 106,658
Income tax (provision) benefit |  | (5,037) |  | (4,753) |  | (7,628) |  | (2,602) |  | 236 |  | - |  | (19,784)
Net income (loss) | $ | 46,318 | $ | 14,088 | $ | 20,373 | $ | 6,945 | $ | (850) | $ | - | $ | 86,874
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ | 400,882 | $ | 157,767 | $ | 1,119 | $ | - | $ | - | $ | - | $ | 559,768
Interdepartmental revenues |  | (289) |  | 16,076 |  | 39,526 |  | - |  | - |  | (55,313) |  | -
Total operating revenues |  | 400,593 |  | 173,843 |  | 40,645 |  | - |  | - |  | (55,313) |  | 559,768
Depreciation and amortization |  | (38,925) |  | (10,060) |  | (7,427) |  | - |  | - |  | - |  | (56,412)
Other operating expenses |  | (297,374) |  | (145,883) |  | (144) |  | (16) |  | (1,045) |  | 55,313 |  | (389,149)
Operating income (loss) |  | 64,294 |  | 17,900 |  | 33,074 |  | (16) |  | (1,045) |  | - |  | 114,207
Other income (deductions), net |  | 7,294 |  | 3,132 |  | - |  | 8,602 |  | (1,973) |  | - |  | 17,055
Interest (expense) income, net |  | (12,198) |  | (3,692) |  | (5,307) |  | - |  | 1,588 |  | - |  | (19,609)
Income (loss) before taxes |  | 59,390 |  | 17,340 |  | 27,767 |  | 8,586 |  | (1,430) |  | - |  | 111,653
Income tax (provision) benefit |  | (13,453) |  | (4,474) |  | (7,534) |  | (2,345) |  | 372 |  | - |  | (27,434)
Net income (loss) | $ | 45,937 | $ | 12,866 | $ | 20,233 | $ | 6,241 | $ | (1,058) | $ | - | $ | 84,219
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ | 413,926 | $ | 148,825 | $ | 348 | $ | - | $ | - | $ | - | $ | 563,099
Interdepartmental revenues |  | (510) |  | 14,974 |  | 44,468 |  | - |  | - |  | (58,932) |  | -
Total operating revenues |  | 413,416 |  | 163,799 |  | 44,816 |  | - |  | - |  | (58,932) |  | 563,099
Depreciation and amortization |  | (36,660) |  | (9,000) |  | (7,417) |  | - |  | - |  | - |  | (53,077)
Other operating expenses |  | (308,100) |  | (135,028) |  | (190) |  | (9) |  | (1,002) |  | 58,932 |  | (385,397)
Operating income (loss) |  | 68,656 |  | 19,771 |  | 37,209 |  | (9) |  | (1,002) |  | - |  | 124,625
Other income (deductions), net |  | 4,539 |  | 1,911 |  | - |  | 9,844 |  | (1,895) |  | - |  | 14,399
Interest (expense) income, net |  | (11,257) |  | (3,234) |  | (5,533) |  | - |  | 700 |  | - |  | (19,324)
Income (loss) before taxes |  | 61,938 |  | 18,448 |  | 31,676 |  | 9,835 |  | (2,197) |  | - |  | 119,700
Income tax (provision) benefit(a) |  | (20,547) |  | (7,303) |  | 8,860 |  | (3,954) |  | 850 |  | - |  | (22,094)
Net income (loss) | $ | 41,391 | $ | 11,145 | $ | 40,536 | $ | 5,881 | $ | (1,347) | $ | - | $ | 97,606
(a) In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act.
| (In thousands) MGE |  | Electric |  | Gas |  | Non-Regulated Energy |  | Consolidation/ Elimination Entries |  | Consolidated Total |
| Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |
| Operating revenues | $ | 408,285 | $ | 159,875 | $ | 695 | $ | - | $ | 568,855 |
| Interdepartmental revenues |  | 806 |  | 16,070 |  | 40,020 |  | (56,896) |  | - |
| Total operating revenues |  | 409,091 |  | 175,945 |  | 40,715 |  | (56,896) |  | 568,855 |
| Depreciation and amortization |  | (52,755) |  | (11,320) |  | (7,487) |  | - |  | (71,562) |
| Other operating expenses |  | (297,156) |  | (145,097) |  | (144) |  | 56,896 |  | (385,501) |
| Operating income |  | 59,180 |  | 19,528 |  | 33,084 |  | - |  | 111,792 |
| Other income, net |  | 7,153 |  | 3,550 |  | - |  | - |  | 10,703 |
| Interest expense, net |  | (14,978) |  | (4,237) |  | (5,083) |  | - |  | (24,298) |
| Income before taxes |  | 51,355 |  | 18,841 |  | 28,001 |  | - |  | 98,197 |
| Income tax provision |  | (5,037) |  | (4,753) |  | (7,628) |  | - |  | (17,418) |
| Net income |  | 46,318 |  | 14,088 |  | 20,373 |  | - |  | 80,779 |
| Less: Net income attributable to |  |  |  |  |  |  |  |  |  |  |
| noncontrolling interest, net of tax |  | - |  | - |  | - |  | (22,349) |  | (22,349) |
| Net income attributable to MGE | $ | 46,318 | $ | 14,088 | $ | 20,373 | $ | (22,349) | $ | 58,430 |
| Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
| Operating revenues | $ | 400,882 | $ | 157,767 | $ | 1,119 | $ | - | $ | 559,768 |
| Interdepartmental revenues |  | (289) |  | 16,076 |  | 39,526 |  | (55,313) |  | - |
| Total operating revenues |  | 400,593 |  | 173,843 |  | 40,645 |  | (55,313) |  | 559,768 |
| Depreciation and amortization |  | (38,925) |  | (10,060) |  | (7,427) |  | - |  | (56,412) |
| Other operating expenses |  | (297,374) |  | (145,883) |  | (144) |  | 55,313 |  | (388,088) |
| Operating income |  | 64,294 |  | 17,900 |  | 33,074 |  | - |  | 115,268 |
| Other income, net |  | 7,294 |  | 3,132 |  | - |  | - |  | 10,426 |
| Interest expense, net |  | (12,198) |  | (3,692) |  | (5,307) |  | - |  | (21,197) |
| Income before taxes |  | 59,390 |  | 17,340 |  | 27,767 |  | - |  | 104,497 |
| Income tax provision |  | (13,453) |  | (4,474) |  | (7,534) |  | - |  | (25,461) |
| Net income |  | 45,937 |  | 12,866 |  | 20,233 |  | - |  | 79,036 |
| Less: net income attributable to |  |  |  |  |  |  |  |  |  |  |
| noncontrolling interest, net of tax |  | - |  | - |  | - |  | (22,552) |  | (22,552) |
| Net income attributable to MGE | $ | 45,937 | $ | 12,866 | $ | 20,233 | $ | (22,552) | $ | 56,484 |
| Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
| Operating revenues | $ | 413,929 | $ | 148,834 | $ | 348 | $ | - | $ | 563,111 |
| Interdepartmental revenues |  | (513) |  | 14,965 |  | 44,468 |  | (58,920) |  | - |
| Total operating revenues |  | 413,416 |  | 163,799 |  | 44,816 |  | (58,920) |  | 563,111 |
| Depreciation and amortization |  | (36,660) |  | (9,000) |  | (7,417) |  | - |  | (53,077) |
| Other operating expenses |  | (308,100) |  | (135,028) |  | (190) |  | 58,920 |  | (384,398) |
| Operating income |  | 68,656 |  | 19,771 |  | 37,209 |  | - |  | 125,636 |
| Other income, net |  | 4,539 |  | 1,911 |  | - |  | - |  | 6,450 |
| Interest expense, net |  | (11,257) |  | (3,234) |  | (5,533) |  | - |  | (20,024) |
| Income before taxes |  | 61,938 |  | 18,448 |  | 31,676 |  | - |  | 112,062 |
| Income tax (provision) benefit(a) |  | (20,547) |  | (7,303) |  | 8,860 |  | - |  | (18,990) |
| Net income |  | 41,391 |  | 11,145 |  | 40,536 |  | - |  | 93,072 |
| Less: Net income attributable to |  |  |  |  |  |  |  |  |  |  |
| noncontrolling interest, net of tax |  | - |  | - |  | - |  | (43,237) |  | (43,237) |
| Net income attributable to MGE | $ | 41,391 | $ | 11,145 | $ | 40,536 | $ | (43,237) | $ | 49,835 |
(a) In December 2017, there was a $21.7 million one-time tax impact as a result of the Tax Act. The following table shows segment information for MGE Energy's and MGE's assets and capital expenditures:
|  | Utility |  |  | Consolidated
(In thousands) MGE Energy |  | Electric |  | Gas |  |  | Non-regulated Energy |  | Transmission Investment(b) |  | All Others |  | Consolidation/ Elimination Entries |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2019 | $ | 1,308,277 | $ | 408,001 |  | $ | 258,004 | $ | 71,668 | $ | 443,278 | $ | (407,564) | $ | 2,081,664
December 31, 2018 |  | 1,193,083 |  | 377,005 |  |  | 265,301 |  | 66,366 |  | 465,661 |  | (378,798) |  | 1,988,618
December 31, 2017 |  | 1,058,988 |  | 354,875 |  |  | 270,384 |  | 61,783 |  | 485,548 |  | (376,396) |  | 1,855,182
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended Dec. 31, 2019 | $ | 125,086 | $ | 36,193 |  | $ | 2,757 | $ | - | $ | - | $ | - | $ | 164,036
Year ended Dec. 31, 2018 |  | 176,399 |  | 30,497 |  |  | 5,301 |  | - |  | - |  | - |  | 212,197
Year ended Dec. 31, 2017 |  | 77,353 |  | 26,847 |  |  | 3,931 |  | - |  | - |  | - |  | 108,131
|  | Utility |  |  | Consolidated |
(In thousands) MGE |  | Electric |  | Gas |  |  | Non-regulated Energy |  | Consolidation/ Elimination Entries |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2019 | $ | 1,308,277 | $ | 408,001 |  | $ | 257,954 | $ | (755) | $ | 1,973,477 |
December 31, 2018 |  | 1,193,083 |  | 377,005 |  |  | 265,251 |  | (448) |  | 1,834,891 |
December 31, 2017 |  | 1,058,988 |  | 354,875 |  |  | 270,334 |  | (156) |  | 1,684,041 |
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Year ended Dec. 31, 2019 | $ | 125,086 | $ | 36,193 |  | $ | 2,757 | $ | - | $ | 164,036 |
Year ended Dec. 31, 2018 |  | 176,399 |  | 30,497 |  |  | 5,301 |  | - |  | 212,197 |
Year ended Dec. 31, 2017 |  | 77,353 |  | 26,847 |  |  | 3,931 |  | - |  | 108,131 |
(b) In December 2017, there was a $20.4 million one-time tax impact as a result of the Tax Act.

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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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