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Segment Information
 9 Months Ended
Sep. 30, 2012
Segment Information Disclosure [Abstract]  
Segment Information

13.       Segment Information - MGE Energy and MGE.

 

MGE Energy operates in the following business segments: electric utility, gas utility, nonregulated energy, transmission investment, and all other. See MGE Energy's and MGE's 2011 Annual Report on Form 10-K for additional discussion of each of these segments.

The following tables show segment information for MGE Energy's operations for the indicated periods:

(In thousands)     Non-     Consolidation/  
MGE Energy     Regulated Transmission All Elimination Consolidated
  Electric Gas Energy Investment Others Entries Total
Three Months Ended September 30, 2012            
Operating revenues$118,914$16,587$2,337$0$0$0$137,838
Interdepartmental revenues 159 4,658 8,679 0 0 (13,496) 0
Total operating revenues 119,073 21,245 11,016 0 0 (13,496) 137,838
Depreciation and amortization (6,530) (1,399) (1,777) 0 0 0 (9,706)
Other operating expenses (78,823) (22,675) (36) 0 (206) 13,496 (88,244)
Operating income (loss) 33,720 (2,829) 9,203 0 (206) 0 39,888
Other income, net 342 97 0 2,280 137 0 2,856
Interest (expense) income, net (2,535) (715) (1,631) 0 32 0 (4,849)
Income (loss) before taxes 31,527 (3,447) 7,572 2,280 (37) 0 37,895
Income tax (provision) benefit (11,873) 1,565 (3,039) (909) 3 0 (14,253)
Net income (loss)$19,654$(1,882)$4,533$1,371$(34)$0$23,642
               
Three Months Ended September 30, 2011            
Operating revenues$114,963$17,249$1,360$0$0$0$133,572
Interdepartmental revenues 163 5,083 9,582 0 0 (14,828) 0
Total operating revenues 115,126 22,332 10,942 0 0 (14,828) 133,572
Depreciation and amortization (7,144) (1,377) (1,775) 0 0 0 (10,296)
Other operating expenses (78,118) (23,422) (44) 0 (186) 14,828 (86,942)
Operating income (loss) 29,864 (2,467) 9,123 0 (186) 0 36,334
Other income, net 35 12 0 2,167 127 0 2,341
Interest (expense) income, net (2,747) (775) (1,660) 0 40 0 (5,142)
Income (loss) before taxes 27,152 (3,230) 7,463 2,167 (19) 0 33,533
Income tax (provision) benefit (9,944) 1,350 (2,994) (870) (37) 0 (12,495)
Net income (loss)$17,208$(1,880)$4,469$1,297$(56)$0$21,038
               
Nine Months Ended September 30, 2012            
Operating revenues$305,189$92,235$6,894$0$0$0$404,318
Interdepartmental revenues 387 10,721 26,032 0 0 (37,140) 0
Total operating revenues 305,576 102,956 32,926 0 0 (37,140) 404,318
Depreciation and amortization (19,554) (4,158) (5,330) 0 0 0 (29,042)
Other operating expenses (223,876) (94,162) (85) 0 (880) 37,140 (281,863)
Operating income (loss) 62,146 4,636 27,511 0 (880) 0 93,413
Other income, net 602 170 0 6,764 439 0 7,975
Interest (expense) income, net (7,727) (2,179) (4,915) 0 104 0 (14,717)
Income (loss) before taxes 55,021 2,627 22,596 6,764 (337) 0 86,671
Income tax (provision) benefit (20,300) (740) (9,069) (2,719) 117 0 (32,711)
Net income (loss)$34,721$1,887$13,527$4,045$(220)$0$53,960
               
Nine Months Ended September 30, 2011            
Operating revenues$291,804$119,748$3,884$0$0$0$415,436
Interdepartmental revenues 391 8,247 28,559 0 0 (37,197) 0
Total operating revenues 292,195 127,995 32,443 0 0 (37,197) 415,436
Depreciation and amortization (21,173) (4,246) (5,250) 0 0 0 (30,669)
Other operating expenses (218,556) (112,192) (138) 0 (649) 37,197 (294,338)
Operating income (loss) 52,466 11,557 27,055 0 (649) 0 90,429
Other income, net 68 21 0 6,434 357 0 6,880
Interest (expense) income, net (8,100) (2,284) (4,677) 0 14 0 (15,047)
Income (loss) before taxes 44,434 9,294 22,378 6,434 (278) 0 82,262
Income tax (provision) benefit (15,666) (3,532) (8,981) (2,592) 53 0 (30,718)
Net income (loss)$28,768$5,762$13,397$3,842$(225)$0$51,544

The following tables show segment information for MGE's operations for the indicated periods:

(In thousands)     Non-   Consolidation/  
MGE     Regulated Transmission Elimination Consolidated
  Electric Gas Energy Investment Entries Total
Three Months Ended September 30, 2012           
Operating revenues$118,914$16,587$2,337$0$0$137,838
Interdepartmental revenues 159 4,658 8,679 0 (13,496) 0
Total operating revenues 119,073 21,245 11,016 0 (13,496) 137,838
Depreciation and amortization (6,530) (1,399) (1,777) 0 0 (9,706)
Other operating expenses* (90,946) (21,180) (3,075) 0 13,496 (101,705)
Operating income (loss)* 21,597 (1,334) 6,164 0 0 26,427
Other income, net* 592 167 0 1,371 0 2,130
Interest expense, net (2,535) (715) (1,631) 0 0 (4,881)
Net income (loss) 19,654 (1,882) 4,533 1,371 0 23,676
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,153) (6,153)
Net income (loss) attributable to MGE$19,654$(1,882)$4,533$1,371$(6,153)$17,523
             
Three Months Ended September 30, 2011           
Operating revenues$114,963$17,249$1,360$0$0$133,572
Interdepartmental revenues 163 5,083 9,582 0 (14,828) 0
Total operating revenues 115,126 22,332 10,942 0 (14,828) 133,572
Depreciation and amortization (7,144) (1,377) (1,775) 0 0 (10,296)
Other operating expenses* (88,013) (22,057) (3,039) 0 14,828 (98,281)
Operating income (loss)* 19,969 (1,102) 6,128 0 0 24,995
Other (deductions) income, net* (14) (4) 0 1,297 0 1,279
Interest expense, net (2,747) (775) (1,660) 0 0 (5,182)
Net income (loss) 17,208 (1,881) 4,468 1,297 0 21,092
Less: net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (6,010) (6,010)
Net income (loss) attributable to MGE$17,208$(1,881)$4,468$1,297$(6,010)$15,082
             
Nine Months Ended September 30, 2012           
Operating revenues$305,189$92,235$6,894$0$0$404,318
Interdepartmental revenues 387 10,721 26,032 0 (37,140) 0
Total operating revenues 305,576 102,956 32,926 0 (37,140) 404,318
Depreciation and amortization (19,554) (4,158) (5,330) 0 0 (29,042)
Other operating expenses* (244,303) (94,938) (9,154) 0 37,140 (311,255)
Operating income* 41,719 3,860 18,442 0 0 64,021
Other income, net* 729 206 0 4,045 0 4,980
Interest expense, net (7,727) (2,179) (4,915) 0 0 (14,821)
Net income 34,721 1,887 13,527 4,045 0 54,180
Less: Net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (18,305) (18,305)
Net income attributable to MGE$34,721$1,887$13,527$4,045$(18,305)$35,875
             
Nine Months Ended September 30, 2011           
Operating revenues$291,804$119,748$3,884$0$0$415,436
Interdepartmental revenues 391 8,247 28,559 0 (37,197) 0
Total operating revenues 292,195 127,995 32,443 0 (37,197) 415,436
Depreciation and amortization (21,173) (4,246) (5,250) 0 0 (30,669)
Other operating expenses* (234,145) (115,701) (9,119) 0 37,197 (321,768)
Operating income* 36,877 8,048 18,074 0 0 62,999
Other (deductions) income, net* (8) (2) 0 3,842 0 3,832
Interest expense, net (8,100) (2,284) (4,677) 0 0 (15,061)
Net income 28,769 5,762 13,397 3,842 0 51,770
Less: net income attributable to            
noncontrolling interest, net of tax 0 0 0 0 (17,935) (17,935)
Net income attributable to MGE$28,769$5,762$13,397$3,842$(17,935)$33,835
             
*Amounts are shown net of the related tax expense, consistent with the presentation on the consolidated MGE Income Statement.

The following table shows segment information for MGE Energy's and MGE's assets and capital expenditures:
                  
  Utility  Consolidated
(In thousands)     Assets       Consolidation/ 
MGE Energy     not NonregulatedTransmission All Elimination  
  Electric Gas Allocated  Energy Investment Others Entries Total
Assets:                 
September 30, 2012$875,477$265,332$34,926 $291,409$60,236$403,261$(365,985)$1,564,656
December 31, 2011 794,738 285,702 32,882  299,421 57,006 401,862 (412,729) 1,458,882
Capital Expenditures:                 
Nine Months Ended September 30, 2012$55,518$9,749$0 $642$0$0$0$65,909
Year ended Dec. 31, 2011 47,206 15,830 0  2,140 0 0 0 65,176

  Utility  Consolidated
(In thousands)     Assets        
MGE     not NonregulatedTransmission Elimination  
  Electric Gas Allocated  Energy Investment Entries Total
Assets:               
September 30, 2012$875,477$265,332$34,919 $291,359$60,236$10,740$1,538,063
December 31, 2011 794,738 285,702 32,882  299,171 57,006 (35,706) 1,433,793
Capital Expenditures:               
Nine Months Ended September 30, 2012$55,518$9,749$0 $642$0$0$65,909
Year ended Dec. 31, 2011 47,206 15,830 0  2,140 0 0 65,176