Callaway Energy Center Callaway Energy Center (Tables)

12 Months Ended

Dec. 31, 2017

Proceeds From Sale Of Investments In Nuclear Decommissioning Trust Fund And Gross Realized Gains And Losses

The following table presents proceeds from the sale and maturities of investments in Ameren Missouri’s nuclear decommissioning trust fund and the gross realized gains and losses resulting from those sales for the years ended December 31, 2017, 2016, and 2015:



	2017		2016		2015
Proceeds from sales and maturities	$	396	$	377	$	349
Gross realized gains	13		7		8
Gross realized losses	5		4		2

Fair Value Of Securities In Nuclear Decommissioning Trust Fund

The following table presents the costs and fair values of investments in debt and equity securities in Ameren’s and Ameren Missouri’s nuclear decommissioning trust fund at December 31, 2017 and 2016:



Security Type	Cost		Gross Unrealized Gain			Gross Unrealized Loss	Fair Value
2017
Debt securities	$	228	$	5	$	1	$	232
Equity securities	155		318			5	468
Cash and cash equivalents	2		—			—	2
Other^(a)	2		—			—	2
Total	$	387	$	323	$	6	$	704
2016
Debt securities	$	197	$	3	$	4	$	196
Equity securities	161		253			6	408
Cash and cash equivalents	1		—			—	1
Other^(a)	2		—			—	2
Total	$	361	$	256	$	10	$	607


(a)	Represents net receivables and payables relating to pending security sales, interest, and security purchases.

Fair Value Of Securities In Nuclear Decommissioning Trust Fund According To Their Contractual Maturities

The following table presents the costs and fair values of investments in debt securities in Ameren’s and Ameren Missouri’s nuclear decommissioning trust fund according to their contractual maturities at December 31, 2017:



	Cost		Fair Value
Less than 5 years	$	120	$	120
5 years to 10 years	54		55
Due after 10 years	54		57
Total	$	228	$	232

Schedule Of Insurance Coverage At Callaway Energy Center

The following table presents insurance coverage at Ameren Missouri’s Callaway energy center at December 31, 2017. The property coverage and the nuclear liability coverage renewal dates are 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	$	450		$	—
Pool participation	12,986		^(a)	127		^(b)
	$	13,436	^(c)	$	127
Property damage:
NEIL and EMANI	$	3,200	^(d)	$	30	^(e)
Replacement power:
NEIL	$	490	^(f)	$	7	^(e)


(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 $450 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. This limit is subject to change to account for the effects of inflation and changes in the number of licensed reactors.


(d)	NEIL provides $2.7 billion in property damage, stabilization, decontamination, and premature decommissioning insurance for radiation events and $2.3 billion in property damage insurance for nonradiation events. EMANI provides $490 million in property damage insurance for both radiation and nonradiation events.


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


(f)	Provides replacement power cost insurance in the event of a prolonged accidental outage. Weekly indemnity up to $4.5 million for 52 weeks, which commences after the first 12 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 limited to $328 million.