Commitments And Contingencies (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30, 2013. The property coverage and the nuclear liability coverage must be renewed on April 1 and January 1, respectively, of each year.

Type and Source of Coverage	Maximum  Coverages			Maximum Assessments for Single Incidents
Public liability and nuclear worker liability:
American Nuclear Insurers	$	375		$	—
Pool participation	13,312		(a)	128		(b)
	$	13,687	(c)	$	128
Property damage:
Nuclear Electric Insurance Ltd.	$	2,250	(d)	$	23	(e)
European Mutual Association for Nuclear Insurance	500		(f)	—
	$	2,750		$	23
Replacement power:
Nuclear Electric Insurance Ltd.	$	490	(g)	$	9	(e)
Missouri Energy Risk Assurance Company	64		(h)	—

(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 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) Nuclear Electric Insurance Ltd. provides $2.25 billion in property damage, decontamination, and premature decommissioning insurance. There is a $1.7 billion sublimit for non-radiation events of which the top $200 million is a shared limit with other generators purchasing this coverage and includes one free reinstatement.

(e) All Nuclear Electric Insurance Ltd. insured plants could be subject to assessments should losses exceed the accumulated funds from Nuclear Electric Insurance Ltd.

(f) European Mutual Association for Nuclear Insurance provides $500 million in excess of the $2.25 billion property coverage and $1.7 billion non-radiation coverage.

(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. Effective April 1, 2013, non-radiation 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 Nuclear Electric Insurance Ltd. and is for a weekly indemnity up to $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 9 - Related Party Transactions for more information on this affiliate transaction.

Schedule of Estimated Purchase Commitments

The table below presents our estimated fuel, purchased power, and other commitments at September 30, 2013. Ameren’s and Ameren Missouri’s purchased power obligations include a 102-megawatt power purchase agreement with a wind farm operator that expires in 2024. Ameren’s and Ameren Illinois’ purchased power obligations include the Ameren Illinois power purchase agreements entered into as part of the IPA-administered power procurement process. Included in the Other column are minimum purchase commitments under contracts for equipment, design and construction, and meter reading services at September 30, 2013. Ameren's and Ameren Illinois' Other column also include obligations related to IEIMA. In addition, the Other column includes Ameren's and Ameren Missouri's obligations related to energy efficiency programs under the MEEIA as approved by the MoPSC's December 2012 electric rate order. The order provides that, beginning in 2013, Ameren Missouri will invest approximately $147 million over three years for energy efficiency programs.

	Coal		Natural Gas		Nuclear Fuel		Purchased Power(a)		Methane Gas		Other		Total
Ameren:(b)
2013	$	605	$	109	$	17	$	162	$	1	$	87	$	981
2014	617		292		68		302		3		158		1,440
2015	640		155		63		154		4		114		1,130
2016	665		85		81		67		4		64		966
2017	683		47		58		44		5		56		893
Thereafter	245		100		216		501		97		246		1,405
Total	$	3,455	$	788	$	503	$	1,230	$	114	$	725	$	6,815
Ameren Missouri:
2013	$	605	$	27	$	17	$	3	$	1	$	66	$	719
2014	617		50		68		19		3		127		884
2015	640		30		63		19		4		85		841
2016	665		16		81		19		4		40		825
2017	683		11		58		19		5		32		808
Thereafter	245		28		216		129		97		144		859
Total	$	3,455	$	162	$	503	$	208	$	114	$	494	$	4,936
Ameren Illinois:
2013	$	—	$	82	$	—	$	159	$	—	$	9	$	250
2014	—		242		—		283		—		22		547
2015	—		125		—		135		—		24		284
2016	—		69		—		48		—		24		141
2017	—		36		—		25		—		24		85
Thereafter	—		72		—		372		—		102		546
Total	$	—	$	626	$	—	$	1,022	$	—	$	205	$	1,853

(a) The purchased power amounts for Ameren and Ameren Illinois includes twenty-year agreements for renewable energy credits that were entered into in December 2010 with various renewable energy suppliers. The agreements contain a provision that allows Ameren Illinois to reduce the quantity purchased in the event that Ameren Illinois would not be able to recover the costs associated with the renewable energy credits.

(b) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.

Schedule of Estimated Capital Costs to Comply With Existing and Known Emissions Related Regulations

Continuing Operations:

	2013		2014 - 2017					2018 - 2022					Total
AMO(a)	$	105	$	215	-	$	260	$	795	-	$	975	$	1,115	-	$	1,340

(a) Ameren Missouri’s expenditures are expected to be recoverable from ratepayers.

Discontinued Operations:

	2013		2014 - 2017					2018 - 2022					Total
Genco(a)	$	30	$	100	-	$	125	$	220	-	$	270	$	350	-	$	425
AERG	5		20		-	25		20		-	25		45		-	55
Total(b)	$	35	$	120	-	$	150	$	240	-	$	295	$	395	-	$	480

(a) Includes estimated costs of approximately $20 million annually, excluding capitalized interest, from 2013 through 2017 for construction of two scrubbers at the Newton energy center.

(b) Assumes the Merchant Generation facilities are owned by Ameren.

Schedule of Estimated Obligations for Manufactured Gas Plant Remediation

The following table presents, as of September 30, 2013, the estimated obligation to complete the remediation of these former MGP sites.

	Estimate				Recorded   Liability(a)
	Low		High
Ameren	$	251	$	337	$	251
Ameren Missouri	5		6		5
Ameren Illinois	246		331		246

(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 September 30, 2013:

Ameren	Ameren Missouri	Ameren Illinois	Total(a)
1	55	63	85

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