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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2011
Callaway Energy Center
Type and Source of Coverage    Maximum Coverages     Maximum Assessments
for Single Incidents		  

Public liability and nuclear worker liability:

     

American Nuclear Insurers

    $ 375      $ -   

Pool participation

      12,219 (a)      118 (b) 
   $ 12,594 (c)    $ 118   

Property damage:

     

Nuclear Electric Insurance Ltd.

    $ 2,750 (d)    $ 23   

Replacement power:

     

Nuclear Electric Insurance Ltd.

    $ 490 (e)    $ 9   

Energy Risk Assurance Company

    $ 64 (f)    $ -   

 

(a) Provided through mandatory participation in an industry-wide retrospective premium assessment program.
(b) Retrospective premium under Price-Anderson. This is subject to retrospective assessment with respect to a covered loss in excess of $375 million in the event of an incident at any licensed U.S. commercial reactor, payable at $17.5 million per year.
(c) Limit of liability for each incident under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended. A company could be assessed up to $118 million per incident for each licensed reactor it operates with a maximum of $17.5 million per incident to be paid in a calendar year for each reactor. This limit is subject to change to account for the effects of inflation and changes in the number of licensed reactors.
(d) Provides for $500 million in property damage and decontamination, excess property insurance, and premature decommissioning coverage up to $2.25 billion for losses in excess of the $500 million primary coverage.
(e) Provides the replacement power cost insurance in the event of a prolonged accidental outage at our nuclear energy center. Weekly indemnity up to $4.5 million for 52 weeks, which commences after the first eight weeks of an outage, plus up to $3.6 million per week for a minimum of 71 weeks thereafter for a total not exceeding the policy limit of $490 million.
(f) Provides the replacement power cost insurance in the event of a prolonged accidental outage at our nuclear energy center. The coverage commences after the first 52 weeks of insurance coverage from Nuclear Electric Insurance Ltd. and is for a weekly indemnity of $900,000 for 71 weeks in excess of the $3.6 million per week set forth above. Energy Risk Assurance Company is an affiliate and has reinsured this coverage with third-party insurance companies. See Note 8 - Related Party Transactions for more information on this affiliate transaction.
Schedule of Estimated Capital Costs to Comply with Existing and Known Emissions Related Regulations
      2011      2012 - 2015      2016 - 2020      Total  

AMO(a)

    $ 40       $ 315     

-

    $ 390       $ 905     

-

    $ 1,105       $ 1,260     

-

    $ 1,535   

Genco

          125         355     

-

      435         60     

-

      75         540     

-

      635   

AERG

      10         170     

-

      210         10     

-

      15         190     

-

      235   

Ameren

    $ 175       $     840     

-

    $     1,035       $     975     

-

    $   1,195       $   1,990     

-

    $   2,405   

 

(a) Ameren Missouri's expenditures are expected to be recoverable from ratepayers.
Schedule of Estimated Obligations for Manufactured Gas Plant Remediation
      Estimate          
      Low      High      Recorded
   Liability(a)		  

Ameren

    $   121       $   199       $ 121   

Ameren Missouri

      3         4         3   

Ameren Illinois

      118         195         118   

 

(a) Recorded liability represents the estimated minimum probable obligations, as no other amount within the range provided a better estimate.
Schedule of Asbestos-Related Litigation Pending Lawsuits
Ameren    AMO    AIC    Genco   Total(a)

5

    54    74    (b)   95

 

(a) Total does not equal the sum of the subsidiary unit lawsuits because some of the lawsuits name multiple Ameren entities as defendants.
(b) As of June 30, 2011, eight asbestos-related lawsuits were pending against EEI. The general liability insurance maintained by EEI provides coverage with respect to liabilities arising from asbestos-related claims.
Coal [Member]
  
Schedule of Estimated Purchased Power Commitments
      2011      2012      2013      2014      2015      Thereafter  

Ameren

    $     669       $     1,153       $     801       $     643       $     634       $     1,651   

Ameren Missouri

      244         618         609         630         620         1,589   
Purchase Power [Member]
  
Schedule of Estimated Purchased Power Commitments
      2011      2012      2013      2014      2015      Thereafter  

Ameren

    $     178       $     200       $       314       $     129       $     55       $     826   

Ameren Illinois

      165         177         290         106         32         624