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Regulatory Matters (Details Textuals) (USD $)
3 Months Ended6 Months Ended9 Months Ended48 Months Ended
Mar. 31, 2011
Jun. 30, 2011
Sep. 30, 2011
percent
people
years
kWh
Days
weeks
MCF
Sep. 30, 2011
Electric Utility [Member]
Dec. 31, 2015
Gas Utility [Member]
Reglatory Asset and Liability [Line Items]     
MPSC Approved Annual Rate Increase  $ 175,000,000  
MPSC Approved Return on Equity  10.50%  
Expected Permanent Capital Structure Equity Percent  49.20%  
Expected Permanent Capital Structure Debt Percent  50.80%  
Self Implemented Rate Increase 107,000,000   
Period for Report to MPSC on Revenues Collected Through Self Implemented Rate Increase  90  
Amount of Credit to CIM Regulatory Asset  31,000,000  
Annual Revenue Decoupling Mechanism Collar on Surcharge and Refund Year 1  1.50%  
Annual Revenue Decoupling Mechanism Collar on Surcharge and Refund Year 2 and Subsequent Years  3.00%  
To Reduce Nuclear Decommisssioning Surcharge Annually  20,000,000  
Requesting Authority to Refund Uncollectible Expense to Customers7,000,000    
MPSC Authorized Refund to Customer Bills  7,000,000  
Requested Recovery of Restoration Expenses19,500,000    
MPSC Authorized Surcharges to Recover Restoration Expenses  19,500,000  
Requested Authority to Refund Revenue Decoupling Mechanism 56,000,000   
Possible Refund Calculations for Revenue Decoupling Mechanism Maximum  71,000,000  
Under Recovery for the Pension Equalization Mechanism  7,100,000  
Overy Recovery on Refund for Self Implemented Rates  3,800,000  
Net Over Recovery of Power Supply Cost Recovery Expense  15,600,000  
Power Supply Cost Recovery Plan Case Factor Current Year  2.98  
Power Supply Cost Recovery Expense Forecast For Current Year  1,200,000,000  
Power Supply Cost Recovery Under Collection One Year Prior  36,000,000  
Power Supply cost Recovery Plan Case Factor Next Year  4.18  
Power Supply Cost Recovery Expense Forecast Next Year  1,400,000,000  
Projected Power Supply Cost Recovery Under Recovery for Current Year  158,000,000  
Requested Recovery of Enery Optimization Expenses for Future Period   $ 294,000,000$ 103,000,000