Madison Gas and Electric Company Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Items not affecting cash:
Depreciation and amortization	$ 40,695	$ 38,838	$ 38,707
Deferred income taxes	49,884us-gaap_DeferredIncomeTaxExpenseBenefit	38,365us-gaap_DeferredIncomeTaxExpenseBenefit	44,797us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for doubtful receivables	1,898us-gaap_ProvisionForDoubtfulAccounts	2,448us-gaap_ProvisionForDoubtfulAccounts	2,498us-gaap_ProvisionForDoubtfulAccounts
Employee benefit plan expenses	(1,080)	13,303	18,353
Equity earnings in ATC	(9,150)	(9,434)	(9,079)
Other items	729us-gaap_OtherNoncashIncomeExpense	117us-gaap_OtherNoncashIncomeExpense	1,283us-gaap_OtherNoncashIncomeExpense
Changes in working capital items:
Trade and other receivables (change)	2,115	(3,827)	(6,208)
Inventories (change)	(10,399)us-gaap_IncreaseDecreaseInInventories	2,488us-gaap_IncreaseDecreaseInInventories	1,457us-gaap_IncreaseDecreaseInInventories
Unbilled revenues (change)	720	(3,720)	(2,508)
Prepaid taxes (change)	(19,804)us-gaap_IncreaseDecreaseInPrepaidTaxes	414us-gaap_IncreaseDecreaseInPrepaidTaxes	2,731us-gaap_IncreaseDecreaseInPrepaidTaxes
Other current assets (change)	(5,693)	2,514	4,093
Accounts payable (change)	2,756	858	(272)
Other current liabilities (change)	(4,195)	6,271	425
Dividend income from ATC	7,740	7,404	7,146
Cash contributions to pension and other postretirement plans	(3,321)	(34,765)	(28,857)
Debt make-whole premium	0	(6,757)	0
Other noncurrent items, net	(4,452)	10,845	6,992
Cash Provided by (Used for) Operating Activities	128,762	140,267	146,004
Investing Activities:
Capital expenditures	(92,676)	(119,047)	(98,435)
Capital contributions to investments	(2,185)	(1,660)	(2,419)
Other investing	(1,297)	(1,205)	(496)
Cash Provided by (Used for) Investing Activities	(96,158)	(121,922)	(101,353)
Financing Activities:
Repayment of long-term debt	(4,103)us-gaap_RepaymentsOfLongTermDebt	(43,012)us-gaap_RepaymentsOfLongTermDebt	(30,668)us-gaap_RepaymentsOfLongTermDebt
Issuance of long-term debt	0	85,000	28,000
Increase in short-term debt	7,000	0	0
Other financing	(130)	(770)	(844)
Cash Provided by (Used for) Financing Activities	(35,662)	4,111	(39,463)
Change in Cash and Cash Equivalents:	(3,058)	22,456	5,188
Cash and cash equivalents at beginning of period	68,813	46,357	41,169
Cash and cash equivalents at end of period	65,755	68,813	46,357
Supplemental disclosures of cash flow information:
Interest paid	20,478us-gaap_InterestPaid	17,991us-gaap_InterestPaid	19,499us-gaap_InterestPaid
Income taxes paid	19,579us-gaap_IncomeTaxesPaid	8,046us-gaap_IncomeTaxesPaid	3,544us-gaap_IncomeTaxesPaid
Income taxes received	(644)us-gaap_ProceedsFromIncomeTaxRefunds	(1,339)us-gaap_ProceedsFromIncomeTaxRefunds	(12,536)us-gaap_ProceedsFromIncomeTaxRefunds
Significant noncash investing activities:
Accrued capital expenditures	1,569	9,892	10,317
MGE [Member]
Operating Activities:
Net Income	81,938	76,445	65,306
Items not affecting cash:
Depreciation and amortization	40,648	38,834	38,707
Deferred income taxes	49,603	37,462	44,112
Provision for doubtful receivables	1,898	2,448	2,498
Employee benefit plan expenses	(1,080)	13,303	18,353
Equity earnings in ATC	(9,150)	(9,434)	(9,079)
Other items	1,280	651	1,813
Changes in working capital items:
Trade and other receivables (change)	(4,455)	(3,699)	(7,219)
Inventories (change)	(10,398)	2,488	1,457
Unbilled revenues (change)	720	(3,720)	(2,508)
Prepaid taxes (change)	(15,169)	(373)	(1,584)
Other current assets (change)	(5,693)	2,518	4,092
Accounts payable (change)	2,741	126	(1,658)
Accrued interest and taxes (change)	(1,001)	2,065	211
Other current liabilities (change)	(3,144)	2,975	(714)
Dividend income from ATC	7,740	7,404	7,146
Cash contributions to pension and other postretirement plans	(3,321)	(34,765)	(28,857)
Debt make-whole premium	0	(6,757)	0
Other noncurrent items, net	(4,619)	10,713	6,696
Cash Provided by (Used for) Operating Activities	128,538	138,684	138,772
Investing Activities:
Capital expenditures	(92,676)	(119,047)	(98,435)
Capital contributions to investments	(1,775)	(1,420)	(2,140)
Other investing	(1,146)	(130)	(508)
Cash Provided by (Used for) Investing Activities	(95,597)	(120,597)	(101,083)
Financing Activities:
Cash dividends paid to parent by MGE	(26,500)	(25,000)	(20,404)
Distributions to parent from noncontrolling interest	(21,359)	(27,365)	(23,500)
Equity contribution received by noncontrolling interest	1,775	1,420	2,130
Repayment of long-term debt	(4,103)	(43,012)	(30,668)
Issuance of long-term debt	0	85,000	28,000
Increase in short-term debt	7,000	0	0
Other financing	0	(672)	(795)
Cash Provided by (Used for) Financing Activities	(43,187)	(9,629)	(45,237)
Change in Cash and Cash Equivalents:	(10,246)	8,458	(7,548)
Cash and cash equivalents at beginning of period	14,808	6,350	13,898
Cash and cash equivalents at end of period	4,562	14,808	6,350
Supplemental disclosures of cash flow information:
Interest paid	20,478	17,991	19,499
Income taxes paid	67	144	44
Income taxes received	(644)	0	(448)
Significant noncash investing activities:
Accrued capital expenditures	$ 1,569	$ 9,892	$ 10,317

The increase (decrease) during the reporting period in the amount of accrued interest and taxes.

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- Definition

The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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- Definition

The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

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-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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Balance Type:	debit
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- Definition

The amount of cash received during the period as refunds for the overpayment of taxes.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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- Definition

Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Paragraph 8

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

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-Paragraph 19

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-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Amount of operating expense for depreciation and amortization of regulated operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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