Reportable Segments
9 Months Ended
Sep. 30, 2011
Reportable Segments
12: REPORTABLE SEGMENTS
Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy's common stockholders. The reportable segments for CMS Energy and Consumers are:
CMS Energy:
  •   electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;
 
  •   gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan;
 
  •   enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production; and
 
  •   other, including EnerBank, corporate interest and other expenses, and discontinued operations.
Consumers:
  •   electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;
 
  •   gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and
 
  •   other, including a consolidated special-purpose entity for the sale of accounts receivable.

Presented in the following tables is financial information by reportable segment:
                                 
In Millions  
    Three Months Ended     Nine Months Ended  
September 30   2011     2010     2011     2010  
 
Operating Revenue
                                
CMS Energy, including Consumers
                                
Electric utility
   $ 1,180     $ 1,154     $ 3,026     $ 2,967  
Gas utility
     217       216       1,662       1,569  
Enterprises
     56       63       161       186  
Other
     11       10       34       28  
 
Total Operating Revenue — CMS Energy
   $ 1,464     $ 1,443     $ 4,883     $ 4,750  
 
Consumers
                                
Electric utility
   $ 1,180     $ 1,154     $ 3,026     $ 2,967  
Gas utility
     217       216       1,662       1,569  
 
Total Operating Revenue — Consumers
   $ 1,397     $ 1,370     $ 4,688     $ 4,536  
 
Net Income Available to Common Stockholders
                                
CMS Energy, including Consumers
                                
Electric utility
   $ 159     $ 156     $ 309     $ 283  
Gas utility
     (5 )     2       88       69  
Enterprises
     4       9       36       51  
Discontinued operations
     —       —       2       (17 )
Other
     (19 )     (33 )     (61 )     (87 )
 
Total Net Income Available to Common Stockholders — CMS Energy
   $ 139     $ 134     $ 374     $ 299  
 
Consumers
                                
Electric utility
   $ 159     $ 156     $ 309     $ 283  
Gas utility
     (5 )     2       88       69  
Other
     —       1       1       1  
 
Total Net Income Available to Common Stockholder — Consumers
   $ 154     $ 159     $ 398     $ 353  
 

                 
In Millions  
    September 30, 2011     December 31, 2010  
 
Plant, Property, and Equipment, Gross
                
CMS Energy, including Consumers
                
Electric utility1
   $ 10,311     $ 9,944  
Gas utility1
     4,149       4,063  
Enterprises
     109       102  
Other
     38       36  
 
Total Plant, Property, and Equipment, Gross — CMS Energy
   $ 14,607     $ 14,145  
 
Consumers
                
Electric utility1
   $ 10,311     $ 9,944  
Gas utility1
     4,149       4,063  
Other
     15       15  
 
Total Plant, Property, and Equipment, Gross — Consumers
   $ 14,475     $ 14,022  
 
Assets
                
CMS Energy, including Consumers
                
Electric utility1
   $ 9,607     $ 9,321  
Gas utility1
     4,852       4,614  
Enterprises
     170       191  
Other
     1,329       1,490  
 
Total Assets — CMS Energy
   $ 15,958     $ 15,616  
 
Consumers
                
Electric utility1
   $ 9,607     $ 9,321  
Gas utility1
     4,852       4,614  
Other
     599       904  
 
Total Assets — Consumers
   $ 15,058     $ 14,839  
 
1   Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.
Consumers Energy Company [Member]
 
Reportable Segments
12: REPORTABLE SEGMENTS
Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy's common stockholders. The reportable segments for CMS Energy and Consumers are:
CMS Energy:
  •   electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;
 
  •   gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan;
 
  •   enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production; and
 
  •   other, including EnerBank, corporate interest and other expenses, and discontinued operations.
Consumers:
  •   electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan;
 
  •   gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and
 
  •   other, including a consolidated special-purpose entity for the sale of accounts receivable.

Presented in the following tables is financial information by reportable segment:
                                 
In Millions  
    Three Months Ended     Nine Months Ended  
September 30   2011     2010     2011     2010  
 
Operating Revenue
                                
CMS Energy, including Consumers
                                
Electric utility
   $ 1,180     $ 1,154     $ 3,026     $ 2,967  
Gas utility
     217       216       1,662       1,569  
Enterprises
     56       63       161       186  
Other
     11       10       34       28  
 
Total Operating Revenue — CMS Energy
   $ 1,464     $ 1,443     $ 4,883     $ 4,750  
 
Consumers
                                
Electric utility
   $ 1,180     $ 1,154     $ 3,026     $ 2,967  
Gas utility
     217       216       1,662       1,569  
 
Total Operating Revenue — Consumers
   $ 1,397     $ 1,370     $ 4,688     $ 4,536  
 
Net Income Available to Common Stockholders
                                
CMS Energy, including Consumers
                                
Electric utility
   $ 159     $ 156     $ 309     $ 283  
Gas utility
     (5 )     2       88       69  
Enterprises
     4       9       36       51  
Discontinued operations
     —       —       2       (17 )
Other
     (19 )     (33 )     (61 )     (87 )
 
Total Net Income Available to Common Stockholders — CMS Energy
   $ 139     $ 134     $ 374     $ 299  
 
Consumers
                                
Electric utility
   $ 159     $ 156     $ 309     $ 283  
Gas utility
     (5 )     2       88       69  
Other
     —       1       1       1  
 
Total Net Income Available to Common Stockholder — Consumers
   $ 154     $ 159     $ 398     $ 353  
 

                 
In Millions  
    September 30, 2011     December 31, 2010  
 
Plant, Property, and Equipment, Gross
                
CMS Energy, including Consumers
                
Electric utility1
   $ 10,311     $ 9,944  
Gas utility1
     4,149       4,063  
Enterprises
     109       102  
Other
     38       36  
 
Total Plant, Property, and Equipment, Gross — CMS Energy
   $ 14,607     $ 14,145  
 
Consumers
                
Electric utility1
   $ 10,311     $ 9,944  
Gas utility1
     4,149       4,063  
Other
     15       15  
 
Total Plant, Property, and Equipment, Gross — Consumers
   $ 14,475     $ 14,022  
 
Assets
                
CMS Energy, including Consumers
                
Electric utility1
   $ 9,607     $ 9,321  
Gas utility1
     4,852       4,614  
Enterprises
     170       191  
Other
     1,329       1,490  
 
Total Assets — CMS Energy
   $ 15,958     $ 15,616  
 
Consumers
                
Electric utility1
   $ 9,607     $ 9,321  
Gas utility1
     4,852       4,614  
Other
     599       904  
 
Total Assets — Consumers
   $ 15,058     $ 14,839  
 
1   Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.