XML 43 R46.htm IDEA: XBRL DOCUMENT v2.4.1.9

Commitments And Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Long-term Purchase Commitment [Line Items]

Operating Expense Purchase Obligations

At December 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):

Alliant Energy	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (IPL) (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	74				46				44				44				—				—				208
	193				171				182				175				143				882				1,746
Natural gas	175				69				23				5				2				4				278
Coal (c)	124				78				47				34				8				—				291
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	10				1				—				—				—				—				11
		$514				$333				$260				$214				$153				$886				$2,360

IPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	—				1				—				—				—				—				1
	119				126				138				131				143				882				1,539
Natural gas	108				32				5				2				2				4				153
Coal (c)	61				35				20				11				—				—				127
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	6				—				—				—				—				—				6
	$306					$207				$171				$144				$145				$886				$1,859

WPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a)		$74				$45				$44				$44				$—				$—				$207
Natural gas	67				37				18				3				—				—				125
Coal (c)	63				43				27				23				8				—				164
Other (e)	2				1				—				—				—				—				3
		$206				$126				$89				$70				$8				$—				$499

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. Refer to Note 18 for additional information on purchased power transactions.

(b) Includes commitments incurred under a PPA, which grants IPL rights to purchase up to 431 MWs of capacity and the resulting energy from DAEC for a term through December 31, 2025. If energy delivered is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s fuel adjustment clause.

(c) Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of December 31, 2014 regarding expected future usage, which is subject to change.

(d) Refer to Note 2 for discussion of $34 million of charges recognized by Alliant Energy and IPL in 2011 for forward contracts to purchase SO2 emission allowances.

(e) Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2014.

Schedule of Environmental Liabilities

At December 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):

	Alliant Energy						IPL						WPL
Range of estimated future costs		$12		-	$31			$11		-	$29			$1		-	$2
Current and non-current environmental liabilities	16						14						2

At December 31, current environmental liabilities were included in “Other current liabilities” and non-current environmental liabilities were included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy								IPL								WPL
	2014				2013				2014				2013				2014				2013
Current environmental liabilities		$2.0				$3.6				$1.7				$2.8				$0.3				$0.8
Non-current environmental liabilities	13.5				15.4				11.9				13.6				1.6				1.7
		$15.5				$19.0				$13.6				$16.4				$1.9				$2.5

IPL [Member]

Long-term Purchase Commitment [Line Items]

Operating Expense Purchase Obligations

At December 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):

Alliant Energy	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (IPL) (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	74				46				44				44				—				—				208
	193				171				182				175				143				882				1,746
Natural gas	175				69				23				5				2				4				278
Coal (c)	124				78				47				34				8				—				291
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	10				1				—				—				—				—				11
		$514				$333				$260				$214				$153				$886				$2,360

IPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	—				1				—				—				—				—				1
	119				126				138				131				143				882				1,539
Natural gas	108				32				5				2				2				4				153
Coal (c)	61				35				20				11				—				—				127
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	6				—				—				—				—				—				6
	$306					$207				$171				$144				$145				$886				$1,859

WPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a)		$74				$45				$44				$44				$—				$—				$207
Natural gas	67				37				18				3				—				—				125
Coal (c)	63				43				27				23				8				—				164
Other (e)	2				1				—				—				—				—				3
		$206				$126				$89				$70				$8				$—				$499

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. Refer to Note 18 for additional information on purchased power transactions.

(b) Includes commitments incurred under a PPA, which grants IPL rights to purchase up to 431 MWs of capacity and the resulting energy from DAEC for a term through December 31, 2025. If energy delivered is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s fuel adjustment clause.

(c) Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of December 31, 2014 regarding expected future usage, which is subject to change.

(d) Refer to Note 2 for discussion of $34 million of charges recognized by Alliant Energy and IPL in 2011 for forward contracts to purchase SO2 emission allowances.

(e) Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2014.

Schedule of Environmental Liabilities

At December 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):

	Alliant Energy						IPL						WPL
Range of estimated future costs		$12		-	$31			$11		-	$29			$1		-	$2
Current and non-current environmental liabilities	16						14						2

At December 31, current environmental liabilities were included in “Other current liabilities” and non-current environmental liabilities were included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy								IPL								WPL
	2014				2013				2014				2013				2014				2013
Current environmental liabilities		$2.0				$3.6				$1.7				$2.8				$0.3				$0.8
Non-current environmental liabilities	13.5				15.4				11.9				13.6				1.6				1.7
		$15.5				$19.0				$13.6				$16.4				$1.9				$2.5

WPL [Member]

Long-term Purchase Commitment [Line Items]

Operating Expense Purchase Obligations

At December 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):

Alliant Energy	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (IPL) (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	74				46				44				44				—				—				208
	193				171				182				175				143				882				1,746
Natural gas	175				69				23				5				2				4				278
Coal (c)	124				78				47				34				8				—				291
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	10				1				—				—				—				—				11
		$514				$333				$260				$214				$153				$886				$2,360

IPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a):
DAEC (b)		$119				$125				$138				$131				$143				$882				$1,538
Other	—				1				—				—				—				—				1
	119				126				138				131				143				882				1,539
Natural gas	108				32				5				2				2				4				153
Coal (c)	61				35				20				11				—				—				127
SO2 emission allowances (d)	12				14				8				—				—				—				34
Other (e)	6				—				—				—				—				—				6
	$306					$207				$171				$144				$145				$886				$1,859

WPL	2015				2016				2017				2018				2019				Thereafter				Total
Purchased power (a)		$74				$45				$44				$44				$—				$—				$207
Natural gas	67				37				18				3				—				—				125
Coal (c)	63				43				27				23				8				—				164
Other (e)	2				1				—				—				—				—				3
		$206				$126				$89				$70				$8				$—				$499

(a) Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased. Refer to Note 18 for additional information on purchased power transactions.

(b) Includes commitments incurred under a PPA, which grants IPL rights to purchase up to 431 MWs of capacity and the resulting energy from DAEC for a term through December 31, 2025. If energy delivered is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s fuel adjustment clause.

(c) Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of December 31, 2014 regarding expected future usage, which is subject to change.

(d) Refer to Note 2 for discussion of $34 million of charges recognized by Alliant Energy and IPL in 2011 for forward contracts to purchase SO2 emission allowances.

(e) Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2014.

Schedule of Environmental Liabilities

At December 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):

	Alliant Energy						IPL						WPL
Range of estimated future costs		$12		-	$31			$11		-	$29			$1		-	$2
Current and non-current environmental liabilities	16						14						2

At December 31, current environmental liabilities were included in “Other current liabilities” and non-current environmental liabilities were included in “Other liabilities” on the balance sheets as follows (in millions):

	Alliant Energy								IPL								WPL
	2014				2013				2014				2013				2014				2013
Current environmental liabilities		$2.0				$3.6				$1.7				$2.8				$0.3				$0.8
Non-current environmental liabilities	13.5				15.4				11.9				13.6				1.6				1.7
		$15.5				$19.0				$13.6				$16.4				$1.9				$2.5

X

- Definition

Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q4)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 4

+ Details

Name:	us-gaap_EnvironmentalExitCostsByCostTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: