010010 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 010020 - Statement - MGE Energy Inc Consolidated Statements of Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010040 - Statement - Consolidated Balance Sheets (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010050 - Statement - Consolidated Balance Sheets (Unaudited) (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 010030 - Statement - MGE Energy Inc Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010060 - Statement - MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010070 - Statement - Consolidated Statements of Common Equity (Unaudited) (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 010120 - Disclosure - Investment in ATC link:presentationLink link:calculationLink link:definitionLink 010280 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 010130 - Disclosure - Taxes link:presentationLink link:calculationLink link:definitionLink 010210 - Disclosure - Pension and Other Postretirement Plans link:presentationLink link:calculationLink link:definitionLink 010220 - Disclosure - Share-Based Compensation link:presentationLink link:calculationLink link:definitionLink 010250 - Disclosure - Regional Transmission Organizations link:presentationLink link:calculationLink link:definitionLink 010240 - Disclosure - Derivative and Hedging Instruments link:presentationLink link:calculationLink link:definitionLink 010270 - Disclosure - Rate Matters link:presentationLink link:calculationLink link:definitionLink 010225 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 010230 - Disclosure - Blount Station link:presentationLink link:calculationLink link:definitionLink 010140 - Disclosure - Elm Road link:presentationLink link:calculationLink link:definitionLink 010310 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 010340 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 020000 - Disclosure - Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 030010 - Disclosure - Investment in ATC (Tables) link:presentationLink link:calculationLink link:definitionLink 030020 - Disclosure - Pension and Other Postretirement Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 030050 - Disclosure - Derivative and Hedging Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 030060 - Disclosure - Fair Value of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 030070 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 040000 - Disclosure - Equity and Financing Arrangements (Details) link:presentationLink link:calculationLink link:definitionLink 040020 - Disclosure - Investment in ATC (Details-1) link:presentationLink link:calculationLink link:definitionLink 040030 - Disclosure - Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 040040 - Disclosure - Elm Road (Details) link:presentationLink link:calculationLink link:definitionLink 040050 - Disclosure - Pension and Other Postretirement Plans (Details) link:presentationLink link:calculationLink link:definitionLink 040060 - Disclosure - Share Based Compensation (Details) link:presentationLink link:calculationLink link:definitionLink 040070 - Disclosure - Commitments and Contingencies (Details-1) link:presentationLink link:calculationLink link:definitionLink 040090 - Disclosure - Derivative and Hedging Instruments (Details-1) link:presentationLink link:calculationLink link:definitionLink 040110 - Disclosure - Rate Matters (Details) link:presentationLink link:calculationLink link:definitionLink 040120 - Disclosure - Fair Value of Financial Instruments (Details-1) link:presentationLink link:calculationLink link:definitionLink 040130 - Disclosure - Segment Information (Details) link:presentationLink link:calculationLink link:definitionLink 040091 - Disclosure - Derivative and Hedging Instruments (Details-2) link:presentationLink link:calculationLink link:definitionLink 040121 - Disclosure - Fair Value of Financial Instruments (Details-2) link:presentationLink link:calculationLink link:definitionLink 040122 - Disclosure - Fair Value of Financial Instruments (Details-3) link:presentationLink link:calculationLink link:definitionLink 040092 - Disclosure - Derivative and Hedging Instruments (Details-3) link:presentationLink link:calculationLink link:definitionLink 010090 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 010100 - Disclosure - Equity and Financing Arrangements link:presentationLink link:calculationLink link:definitionLink 010290 - Disclosure - New Accounting Pronouncements link:presentationLink link:calculationLink link:definitionLink 030030 - Disclosure - Commitments and Contingencies (Tables) link:presentationLink link:calculationLink link:definitionLink 030040 - Disclosure - Blount Station (Tables) link:presentationLink link:calculationLink link:definitionLink 040080 - Disclosure - Blount Station (Details) link:presentationLink link:calculationLink link:definitionLink 010035 - Statement - Madison Gas and Electric Company Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010065 - Statement - Madison Gas and Electric Company Consolidated Statements of Common Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010025 - Statement - Madison Gas and Electric Company Consolidated Statements of Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 040140 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink 040025 - Disclosure - Investment in ATC (Details-2) link:presentationLink link:calculationLink link:definitionLink 040075 - Disclosure - Commitments and Contingencies (Details-2) link:presentationLink link:calculationLink link:definitionLink 010026 - Statement - MGE Energy Inc Consolidated Statements of Comprehensive Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010027 - Statement - Madison Gas and Electric Company Consolidated Statements of Comprehensive Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 010028 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parantheticals) link:presentationLink link:calculationLink link:definitionLink 010125 - Disclosure - Columbia Environmental Project Construction link:presentationLink link:calculationLink link:definitionLink 040027 - Disclosure - Columbia Environmental Project Construction (Details) link:presentationLink link:calculationLink link:definitionLink