Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Insurance Coverage at Callaway Energy Center

The following table presents insurance coverage at Ameren Missouri’s Callaway energy center at March 31, 2014. The property coverage and the nuclear liability coverage must be renewed on April 1 and January 1, respectively, of each year. Both coverages were renewed in 2014.

Type and Source of Coverage	Maximum  Coverages			Maximum Assessments for Single Incidents
Public liability and nuclear worker liability:
American Nuclear Insurers	$	375		$	—
Pool participation	13,241		(a)	128		(b)
	$	13,616	(c)	$	128
Property damage:
NEIL	$	2,250	(d)	$	23	(e)
European Mutual Association for Nuclear Insurance	500		(f)	—
	$	2,750		$	23
Replacement power:
NEIL	$	490	(g)	$	9	(e)
Missouri Energy Risk Assurance Company LLC	64		(h)	—

(a) Provided through mandatory participation in an industrywide retrospective premium assessment program.

(b) Retrospective premium under the Price-Anderson Act. 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 United States commercial reactor, payable at $19 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 $128 million per incident for each licensed reactor it operates with a maximum of $19 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) NEIL provides $2.25 billion in property damage, decontamination, and premature decommissioning insurance. There is a $1.7 billion sublimit for nonradiation events, of which the last $200 million is a shared limit with other generators purchasing this coverage. The $1.7 billion sublimit for nonradiation events was not included with the April 1, 2014 renewal.

(e) All NEIL insured plants could be subject to assessments should losses exceed the accumulated funds from NEIL.

(f) European Mutual Association for Nuclear Insurance provides $500 million in excess of the $2.25 billion property coverage provided by NEIL.

(g) Provides 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. Nonradiation events are sub-limited to $327.6 million.

(h) Provides 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 NEIL and is a weekly indemnity of $900,000 for 71 weeks in excess of the $3.6 million per week set forth above. Missouri Energy Risk Assurance Company LLC 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 Obligations for Manufactured Gas Plant Remediation

The following table presents, as of March 31, 2014, the estimated obligation to complete the remediation of these former MGP sites:

	Estimate				Recorded   Liability(a)
	Low		High
Ameren	$	269	$	345	$	269
Ameren Missouri	3		4		3
Ameren Illinois	266		341		266

(a) Recorded liability represents the estimated minimum probable obligations, as no other amount within the range was a better estimate.

Schedule of Asbestors-Related Litigation Pending Lawsuits

The following table presents the pending asbestos-related lawsuits filed against the Ameren Companies as of March 31, 2014:

Ameren	Ameren Missouri	Ameren Illinois	Total(a)
1	47	56	71

(a) Total does not equal the sum of the subsidiary unit lawsuits because some of the lawsuits name multiple Ameren entities as defendants.