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Regulatory Matters (Tables) (Consumers Energy Company [Member]) | 9 Months Ended
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Sep. 30, 2011
2011 Electric Rate Case [Member] |
Schedule of Annual Rate Increase Requested |
|  | In Millions |
Components of the rate increase |  |  |  |
Investment in rate base |  | $ | 81 |
Depreciation and property taxes |  |  | 70 |
Impact of sales declines |  |  | 50 |
Impact of reduced funding for customer assistance programs1 |  |  | 13 |
Reduced operating and maintenance costs |  |  | (17 | )
Cost of capital |  |  | (2 | )
Total |  | $ | 195 |
Power Supply Cost Recover (PSCR) [Member] |
Schedule of Reconciliation Filings Pending with MPSC |
PSCR Year |  | Date Filed |  | Net Underrecovery |  | PSCR Cost of Power Sold
2010 |  | March 2011 |  | $15 million |  | $1.7 billion
Gas Cost Recover (GCR) [Member] |
Schedule of Reconciliation Filings Pending with MPSC |
GCR Year |  | Date Filed |  | Net Overrecovery |  | GCR Cost of Gas Sold
2009-2010 |  | June 2010 |  | $1 million |  | $1.3 billion
2010-2011 |  | June 2011 |  | 6 million |  | 1.2 billion
2010 Gas Rate Case [Member] |
Schedule Of Annual Rate Increase Authorized And Requested |
In Millions |
|  |  |  |  |  | Increase Originally |  |  |  |
|  | Increase Authorized |  |  | Requested by |  |  |  |
Components of the rate increase |  | by the MPSC |  |  | Consumers |  |  | Difference |
Investment in rate base |  | $ | 29 |  |  | $ | 30 |  |  | $ | (1 | )
Impact of sales declines |  |  | 15 |  |  |  | 4 |  |  |  | 11 |
Operating and maintenance costs |  |  | 2 |  |  |  | 16 |  |  |  | (14 | )
Cost of capital |  |  | (15 | ) |  |  | 5 |  |  |  | (20 | )
Total |  | $ | 31 |  |  | $ | 55 |  |  | $ | (24 | )
2011 Gas Rate Case [Member] |
Schedule of Annual Rate Increase Requested |
In Millions |
Components of the rate increase |  |  |  |
Investment in rate base |  | $ | 22 |
Impact of reduced funding for customer assistance programs1 |  |  | 19 |
Cost of capital |  |  | 10 |
Impact of sales declines |  |  | 2 |
Reduced operating and maintenance costs |  |  | (4 | )
Total |  | $ | 49 |

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