Property, Plant and Equipment

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization

We provide for depreciation of Property, Plant and Equipment, excluding coal-mining properties, on a straight-line basis over the estimated useful lives of property, generally using composite rates by functional class. The following tables provide the annual property information:



2014	Regulated							Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges	Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges
	(in millions)						(in years)	(in millions)					(in years)
Generation	$	18,394	$	7,313		1.7 - 3.5%	31 - 132	$	7,333	$	3,135	2.6 - 3.4%	35 - 66
Transmission	12,395		2,877			1.4 - 2.7%	15 - 87	38		17		2.3%	43 - 55
Distribution	17,157		4,145			2.4 - 3.7%	7 - 75	—		—		NA	NA
CWIP	3,088		(126		)	NM	NM	130		1		NM	NM
Other	4,361		2,254			2.1 - 8.6%	5 - 75	1,409		572		17.1%	25 - 50
Total	$	55,395	$	16,463				$	8,910	$	3,725



2013	Regulated							Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges	Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges
	(in millions)						(in years)	(in millions)					(in years)
Generation	$	17,873	$	7,168		1.7 - 3.7%	31 - 132	$	7,201	$	2,969	2.6 - 3.3%	35 - 66
Transmission	10,854		2,805			1.1 - 2.7%	25 - 87	39		16		2.5%	43 - 55
Distribution	16,377		3,988			2.3 - 3.8%	11 - 75	—		—		NA	NA
CWIP	2,326		(121		)	NM	NM	145		1		NM	NM
Other	4,116		1,931			2.0 - 7.9%	5 - 75	1,354		531		NM	NM
Total	$	51,546	$	15,771				$	8,739	$	3,517



2012	Regulated		Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges	Annual Composite Depreciation Rate Ranges	Depreciable Life Ranges
		(in years)		(in years)
Generation	1.7 - 3.8%	31 - 132	2.6 - 3.3%	35 - 66
Transmission	1.2 - 2.8%	25 - 87	NA	NA
Distribution	2.4 - 3.9%	11 - 75	NA	NA
CWIP	NM	NM	NM	NM
Other	1.8 - 9.6%	5 - 75	NM	NM

NA Not applicable.

NM Not meaningful.

We provide for depreciation, depletion and amortization of coal-mining assets over each asset's estimated useful life or the estimated life of each mine, whichever is shorter, using the straight-line method for mining structures and equipment. We use either the straight-line method or the units-of-production method to amortize mine development costs and deplete coal rights based on estimated recoverable tonnages. We include these costs in the cost of coal charged to fuel expense.

For regulated operations, the composite depreciation rate generally includes a component for non-asset retirement obligation (non-ARO) removal costs, which is credited to Accumulated Depreciation and Amortization. Actual removal costs incurred are charged to Accumulated Depreciation and Amortization. Any excess of accrued non-ARO removal costs over actual removal costs incurred is reclassified from Accumulated Depreciation and Amortization and reflected as a regulatory liability. For nonregulated operations, non-ARO removal costs are expensed as incurred.

Asset Retirement Obligations (ARO)

We record ARO in accordance with the accounting guidance for “Asset Retirement and Environmental Obligations” for our legal obligations for asbestos removal and for the retirement of certain ash disposal facilities, closure and monitoring of underground carbon storage facilities at Mountaineer Plant, wind farms and certain coal mining facilities, as well as for nuclear decommissioning of our Cook Plant. We have identified, but not recognized, ARO liabilities related to electric transmission and distribution assets as a result of certain easements on property on which we have assets. Generally, such easements are perpetual and require only the retirement and removal of our assets upon the cessation of the property’s use. We do not estimate the retirement for such easements because we plan to use our facilities indefinitely. The retirement obligation would only be recognized if and when we abandon or cease the use of specific easements, which is not expected.

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO:



	Carrying Amount of ARO
	(in millions)
ARO as of December 31, 2012	$	1,696
Accretion Expense	103
Liabilities Incurred	4
Liabilities Settled	(22		)
Revisions in Cash Flow Estimates	54
ARO as of December 31, 2013	1,835
Accretion Expense	95
Liabilities Incurred	42
Liabilities Settled	(34		)
Revisions in Cash Flow Estimates	81
ARO as of December 31, 2014	$	2,019

As of December 31, 2014 and 2013, our ARO liability included $1.3 billion and $1.2 billion, respectively, for nuclear decommissioning of the Cook Plant. As of December 31, 2014 and 2013, the fair value of assets that are legally restricted for purposes of settling the nuclear decommissioning liabilities totaled $1.8 billion and $1.6 billion, respectively, and are recorded in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

Our amounts of allowance for borrowed, including interest capitalized, and equity funds used during construction is summarized in the following table:



	Years Ended December 31,
	2014		2013		2012
	(in millions)
Allowance for Equity Funds Used During Construction	$	103	$	73	$	93
Allowance for Borrowed Funds Used During Construction	44		40		69

Jointly-owned Electric Facilities

We have electric facilities that are jointly-owned with nonaffiliated companies. Using our own financing, we are obligated to pay a share of the costs of these jointly-owned facilities in the same proportion as our ownership interest. Our proportionate share of the operating costs associated with such facilities is included on the statements of income and the investments and accumulated depreciation are reflected on the balance sheets under Property, Plant and Equipment as follows:



				Company’s Share as of December 31, 2014
	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in millions)
W.C. Beckjord Generating Station, Unit 6 (a)	Coal	12.5	%	$	—	$	—	$	—
Conesville Generating Station, Unit 4 (b)	Coal	43.5	%	336		2		66
J.M. Stuart Generating Station (c)	Coal	26.0	%	553		12		206
Wm. H. Zimmer Generating Station (a)	Coal	25.4	%	812		4		410
Dolet Hills Generating Station, Unit 1 (d)	Lignite	40.2	%	330		4		201
Flint Creek Generating Station, Unit 1 (e)	Coal	50.0	%	125		120		68
Pirkey Generating Station, Unit 1 (e)	Lignite	85.9	%	531		36		381
Oklaunion Generating Station, Unit 1 (f)	Coal	70.3	%	409		10		228
Turk Generating Plant (e)	Coal	73.33	%	1,647		1		70
Transmission	NA	(g)		82		1		49
Total				$	4,825	$	190	$	1,679



				Company’s Share as of December 31, 2013
	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in millions)
W.C. Beckjord Generating Station, Unit 6 (a)	Coal	12.5	%	$	—	$	—	$	—
Conesville Generating Station, Unit 4 (b)	Coal	43.5	%	335		2		55
J.M. Stuart Generating Station (c)	Coal	26.0	%	544		11		190
Wm. H. Zimmer Generating Station (a)	Coal	25.4	%	809		2		399
Dolet Hills Generating Station, Unit 1 (d)	Lignite	40.2	%	262		47		198
Flint Creek Generating Station, Unit 1 (e)	Coal	50.0	%	123		54		66
Pirkey Generating Station, Unit 1 (e)	Lignite	85.9	%	519		29		376
Oklaunion Generating Station, Unit 1 (f)	Coal	70.3	%	404		7		223
Turk Generating Plant (e)	Coal	73.33	%	1,638		13		35
Transmission	NA	(g)		78		—		50
Total				$	4,712	$	165	$	1,592


(a)	Operated by Duke Energy Corporation, a nonaffiliated company. AEP's portion of Beckjord Plant, Unit 6 was impaired in the fourth quarter of 2012. See "Impairments" section of Note 7.


(b)	Operated by AGR.


(c)	Operated by The Dayton Power & Light Company, a nonaffiliated company.


(d)	Operated by CLECO, a nonaffiliated company.


(e)	Operated by SWEPCo.


(f)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(g)	Varying percentages of ownership.


NA	Not applicable.

Appalachian Power Co [Member]

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization

The Registrant Subsidiaries provide for depreciation of Property, Plant and Equipment, excluding coal-mining properties, on a straight-line basis over the estimated useful lives of property, generally using composite rates by functional class. The following tables provide annual property information for the Registrant Subsidiaries:



APCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,824,029	$	2,433,231		3.1%	40	-	121	$	—	$	—	NA	NA
Transmission	2,228,029		507,542			1.7%	15	-	87	—		—		NA	NA
Distribution	3,258,306		722,665			3.5%	13	-	57	—		—		NA	NA
CWIP	321,495		(19,405		)	NM	NM			—		—		NA	NA
Other	339,175		167,171			6.9%	24	-	55	34,345		12,460		NM	NM
Total	$	12,971,034	$	3,811,204						$	34,345	$	12,460



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,745,172	$	2,306,545		3.0%	40	-	121	$	—	$	—	NA	NA
Transmission	2,160,660		490,143			1.6%	25	-	87	—		—		NA	NA
Distribution	3,139,150		674,351			3.5%	11	-	52	—		—		NA	NA
CWIP	184,701		(19,297		)	NM	NM			—		—		NA	NA
Other	323,758		153,797			7.3%	24	-	55	33,759		12,451		NM	NM
Total	$	12,553,441	$	3,605,539						$	33,759	$	12,451



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	3.0%	40	-	121	NA	NA
Transmission	1.6%	25	-	87	NA	NA
Distribution	3.4%	13	-	57	NA	NA
CWIP	NM	NM			NA	NA
Other	6.8%	24	-	55	NM	NM


NA	Not applicable.


NM	Not meaningful.



I&M

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,741,831	$	1,855,162		2.0%	59	-	132	$	—	$	—	NA	NA
Transmission	1,358,419		432,927			1.7%	50	-	75	—		—		NA	NA
Distribution	1,698,409		413,040			2.8%	15	-	70	—		—		NA	NA
CWIP	537,237		(27,858		)	NM	NM			—		—		NA	NA
Other	1,342,813		628,991			6.1%	14	-	45	148,007		108,079		NM	NM
Total	$	8,678,709	$	3,302,262						$	148,007	$	108,079



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,577,906	$	1,887,333		1.9%	59	-	132	$	—	$	—	NA	NA
Transmission	1,304,225		420,295			1.5%	50	-	75	—		—		NA	NA
Distribution	1,625,057		390,014			2.8%	15	-	70	—		—		NA	NA
CWIP	427,164		(18,824		)	NM	NM			—		—		NA	NA
Other	1,268,597		509,426			4.9%	14	-	45	152,764		111,105		NM	NM
Total	$	8,202,949	$	3,188,244						$	152,764	$	111,105



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	59	-	132	NA	NA
Transmission	1.5%	46	-	75	NA	NA
Distribution	2.5%	14	-	70	NA	NA
CWIP	NM	NM			NA	NA
Other	9.6%	14	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



OPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,104,613	$	844,353		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	4,087,601		1,050,888			2.7%	7	-	57	—		—		NA	NA
CWIP	218,667		(39,218		)	NM	NM			—		—		NA	NA
Other	380,453		181,258			7.0%	7	-	50	10,395		839		NM	NM
Total	$	6,791,334	$	2,037,281						$	10,395	$	839



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,011,289	$	814,849		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	3,877,532		1,023,313			2.7%	12	-	60	—		—		NA	NA
CWIP	185,428		(29,825		)	NM	NM			—		—		NA	NA
Other	354,195		163,894			7.5%	25	-	50	10,378		811		NM	NM
Total	$	6,428,444	$	1,972,231						$	10,378	$	811

2012

Regulated

Nonregulated

Functional Class of Property

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

(in years)

Generation

3.0%

Transmission

2.3%

Distribution

2.7%

CWIP

Other

7.3%


NA	Not applicable.


NM	Not meaningful.



PSO

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,264,724	$	585,653		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	788,911		161,056			1.9%	40	-	75	—		—			NA	NA
Distribution	2,080,221		366,325			2.4%	30	-	65	—		—			NA	NA
CWIP	204,753		(11,055		)	NM	NM			—		—			NA	NA
Other	416,398		217,583			4.1%	5	-	40	5,170		(8		)	NM	NM
Total	$	4,755,007	$	1,319,562						$	5,170	$	(8	)



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,203,221	$	583,486		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	731,312		186,040			1.9%	40	-	75	—		—			NA	NA
Distribution	1,986,032		365,299			2.3%	30	-	65	—		—			NA	NA
CWIP	175,890		(15,138		)	NM	NM			—		—			NA	NA
Other	387,856		203,841			4.1%	5	-	40	5,170		(6		)	NM	NM
Total	$	4,484,311	$	1,323,528						$	5,170	$	(6	)



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	35	-	70	NA	NA
Transmission	1.9%	40	-	75	NA	NA
Distribution	2.4%	30	-	65	NA	NA
CWIP	NM	NM			NA	NA
Other	6.6%	5	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



SWEPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,864,543	$	1,101,244		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,300,729		328,783			2.2%	50	-	70	—		—		NA	NA
Distribution	1,894,572		576,808			2.7%	25	-	65	—		—		NA	NA
CWIP (a)	471,689		(8,454		)	NM	NM			291		—		NA	NA
Other	587,027		361,892			4.8%	7	-	51	291,726		143,017		NM	NM
Total	$	8,118,560	$	2,360,273						$	292,017	$	143,017



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,764,429	$	1,062,166		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,165,167		312,567			2.3%	50	-	70	—		—		NA	NA
Distribution	1,843,912		563,087			2.6%	25	-	65	—		—		NA	NA
CWIP (a)	281,849		(7,355		)	NM	NM			—		—		NA	NA
Other	574,131		326,871			5.0%	7	-	51	295,099		134,316		NM	NM
Total	$	7,629,488	$	2,257,336						$	295,099	$	134,316



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation (a)	2.2%	35	-	65	NA	NA
Transmission	2.3%	50	-	70	NA	NA
Distribution	2.6%	25	-	65	NA	NA
CWIP (a)	NM	NM			NA	NA
Other	6.6%	7	-	47	NM	NM


(a)	SWEPCo's regulated section includes amounts related to SWEPCo's Arkansas jurisdictional share of the Turk Plant.


NA	Not applicable.


NM	Not meaningful.

SWEPCo provides for depreciation, depletion and amortization of coal-mining assets over each asset's estimated useful life or the estimated life of each mine, whichever is shorter, using the straight-line method for mining structures and equipment. SWEPCo uses either the straight-line method or the units-of-production method to amortize mine development costs and deplete coal rights based on estimated recoverable tonnages. SWEPCo includes these costs in fuel expense.

For regulated operations, the composite depreciation rate generally includes a component for nonasset retirement obligation (non-ARO) removal costs, which is credited to Accumulated Depreciation and Amortization. Actual removal costs incurred are charged to Accumulated Depreciation and Amortization. Any excess of accrued non-ARO removal costs over actual removal costs incurred is reclassified from Accumulated Depreciation and Amortization and reflected as a regulatory liability. For nonregulated operations, non-ARO removal costs are expensed as incurred.

Asset Retirement Obligations (ARO)

The Registrant Subsidiaries record ARO in accordance with the accounting guidance for “Asset Retirement and Environmental Obligations” for the retirement of certain ash disposal facilities, closure and monitoring of underground carbon storage facilities at Mountaineer Plant and coal mining facilities as well as asbestos removal. I&M records ARO for the decommissioning of the Cook Plant. The Registrant Subsidiaries have identified, but not recognized, ARO liabilities related to electric transmission and distribution assets as a result of certain easements on property on which assets are owned. Generally, such easements are perpetual and require only the retirement and removal of assets upon the cessation of the property’s use. The retirement obligation is not estimable for such easements since the Registrant Subsidiaries plan to use their facilities indefinitely. The retirement obligation would only be recognized if and when the Registrant Subsidiaries abandon or cease the use of specific easements, which is not expected.

As of December 31, 2014 and 2013, I&M’s ARO liability for nuclear decommissioning of the Cook Plant was $1.3 billion and $1.2 billion, respectively. These liabilities are reflected in Asset Retirement Obligations on I&M’s balance sheets. As of December 31, 2014 and 2013, the fair value of I&M’s assets that are legally restricted for purposes of settling decommissioning liabilities totaled $1.8 billion and $1.6 billion, respectively. These assets are included in Spent Nuclear Fuel and Decommissioning Trusts on I&M’s balance sheets.

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO by Registrant Subsidiary:



Company	ARO as of December 31, 2013		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates		Contribution/ (Distribution) of OPCo Generation Assets		ARO as of December 31, 2014
(in thousands)
APCo (a)(d)	$	152,607	$	9,081	$	—	$	(23,992	)	$	10,681	$	—	$	148,377
I&M (a)(b)(d)	1,255,184		60,005		—		(1,380		)	28,740		—		1,342,549
OPCo (a)(d)	1,297		80		—		(26		)	10		—		1,361
PSO (a)(d)	22,928		1,786		—		(749		)	14,055		—		38,020
SWEPCo (a)(c)(d)	87,630		5,156		—		(1,102		)	2,710		—		94,394



Company	ARO as of December 31, 2012		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates			Contribution/ (Distribution) of OPCo Generation Assets			ARO as of December 31, 2013
(in thousands)
APCo (a)(d)	$	115,168	$	7,343	$	—	$	(7,298	)	$	7,083		$	30,311		$	152,607
I&M (a)(b)(d)	1,192,313		72,658		—		(635		)	(9,152		)	—			1,255,184
OPCo (a)(d)	269,940		14,957		158		(9,788		)	53,208			(327,178		)	1,297
PSO (a)(d)	21,999		1,703		—		(755		)	(19		)	—			22,928
SWEPCo (a)(c)(d)	78,017		4,912		4,191		(2,699		)	3,209			—			87,630


(a)	Includes ARO related to ash disposal facilities.


(b)	Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.2 billion as of December 31, 2014 and 2013.


(c)	Includes ARO related to Sabine and DHLC.


(d)	Includes ARO related to asbestos removal.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

The Registrant Subsidiaries’ amounts of allowance for equity funds used during construction are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	7,053	$	2,353	$	1,684
I&M	18,873		19,943		9,724
OPCo	6,913		4,961		3,492
PSO	3,071		4,187		2,007
SWEPCo	11,947		7,338		57,054

The Registrant Subsidiaries’ amounts of allowance for borrowed funds used during construction, including capitalized interest, are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	3,810	$	1,522	$	1,347
I&M	8,015		9,752		4,717
OPCo	4,436		10,102		9,046
PSO	1,792		2,272		1,098
SWEPCo	6,949		4,262		48,499

Jointly-owned Electric Facilities

The Registrant Subsidiaries have electric facilities that are jointly-owned with affiliated and nonaffiliated companies. Using its own financing, each participating company is obligated to pay its share of the costs of any such jointly-owned facilities in the same proportion as its ownership interest. Each Registrant Subsidiary’s proportionate share of the operating costs associated with such facilities is included in its statements of income and the investments and accumulated depreciation are reflected in its balance sheets under Property, Plant and Equipment as follows:



				Company’s Share as of December 31, 2014
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50.0	%	$	801,536	$	119,921	$	492,184

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	94,678	$	2,558	$	57,490

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	329,706	$	3,739	$	201,321
Flint Creek Generating Station, Unit 1 (d)	Coal	50.0	%	125,114		119,629		67,948
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	531,064		36,490		381,058
Turk Generating Plant (d)	Coal	73.33	%	1,647,005		889		69,820
Total				$	2,632,889	$	160,747	$	720,147



				Company’s Share as of December 31, 2013
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50	%	$	797,485	$	54,577	$	471,787

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	93,555	$	1,844	$	57,576

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	261,685	$	47,131	$	197,720
Flint Creek Generating Station, Unit 1 (d)	Coal	50	%	122,566		54,281		65,546
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	519,158		28,833		375,718
Turk Generating Plant (d)	Coal	73.33	%	1,638,044		13,081		35,455
Total				2,541,453		143,326		674,439


(a)	Operated by I&M.


(b)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(c)	Operated by CLECO, a nonaffiliated company.


(d)	Operated by SWEPCo.


(e)	Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the "Rockport Lease" section of Note 13.

Indiana Michigan Power Co [Member]

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization



APCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,824,029	$	2,433,231		3.1%	40	-	121	$	—	$	—	NA	NA
Transmission	2,228,029		507,542			1.7%	15	-	87	—		—		NA	NA
Distribution	3,258,306		722,665			3.5%	13	-	57	—		—		NA	NA
CWIP	321,495		(19,405		)	NM	NM			—		—		NA	NA
Other	339,175		167,171			6.9%	24	-	55	34,345		12,460		NM	NM
Total	$	12,971,034	$	3,811,204						$	34,345	$	12,460



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,745,172	$	2,306,545		3.0%	40	-	121	$	—	$	—	NA	NA
Transmission	2,160,660		490,143			1.6%	25	-	87	—		—		NA	NA
Distribution	3,139,150		674,351			3.5%	11	-	52	—		—		NA	NA
CWIP	184,701		(19,297		)	NM	NM			—		—		NA	NA
Other	323,758		153,797			7.3%	24	-	55	33,759		12,451		NM	NM
Total	$	12,553,441	$	3,605,539						$	33,759	$	12,451



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	3.0%	40	-	121	NA	NA
Transmission	1.6%	25	-	87	NA	NA
Distribution	3.4%	13	-	57	NA	NA
CWIP	NM	NM			NA	NA
Other	6.8%	24	-	55	NM	NM


NA	Not applicable.


NM	Not meaningful.



I&M

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,741,831	$	1,855,162		2.0%	59	-	132	$	—	$	—	NA	NA
Transmission	1,358,419		432,927			1.7%	50	-	75	—		—		NA	NA
Distribution	1,698,409		413,040			2.8%	15	-	70	—		—		NA	NA
CWIP	537,237		(27,858		)	NM	NM			—		—		NA	NA
Other	1,342,813		628,991			6.1%	14	-	45	148,007		108,079		NM	NM
Total	$	8,678,709	$	3,302,262						$	148,007	$	108,079



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,577,906	$	1,887,333		1.9%	59	-	132	$	—	$	—	NA	NA
Transmission	1,304,225		420,295			1.5%	50	-	75	—		—		NA	NA
Distribution	1,625,057		390,014			2.8%	15	-	70	—		—		NA	NA
CWIP	427,164		(18,824		)	NM	NM			—		—		NA	NA
Other	1,268,597		509,426			4.9%	14	-	45	152,764		111,105		NM	NM
Total	$	8,202,949	$	3,188,244						$	152,764	$	111,105



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	59	-	132	NA	NA
Transmission	1.5%	46	-	75	NA	NA
Distribution	2.5%	14	-	70	NA	NA
CWIP	NM	NM			NA	NA
Other	9.6%	14	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



OPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,104,613	$	844,353		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	4,087,601		1,050,888			2.7%	7	-	57	—		—		NA	NA
CWIP	218,667		(39,218		)	NM	NM			—		—		NA	NA
Other	380,453		181,258			7.0%	7	-	50	10,395		839		NM	NM
Total	$	6,791,334	$	2,037,281						$	10,395	$	839



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,011,289	$	814,849		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	3,877,532		1,023,313			2.7%	12	-	60	—		—		NA	NA
CWIP	185,428		(29,825		)	NM	NM			—		—		NA	NA
Other	354,195		163,894			7.5%	25	-	50	10,378		811		NM	NM
Total	$	6,428,444	$	1,972,231						$	10,378	$	811

2012

Regulated

Nonregulated

Functional Class of Property

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

(in years)

Generation

3.0%

Transmission

2.3%

Distribution

2.7%

CWIP

Other

7.3%


NA	Not applicable.


NM	Not meaningful.



PSO

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,264,724	$	585,653		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	788,911		161,056			1.9%	40	-	75	—		—			NA	NA
Distribution	2,080,221		366,325			2.4%	30	-	65	—		—			NA	NA
CWIP	204,753		(11,055		)	NM	NM			—		—			NA	NA
Other	416,398		217,583			4.1%	5	-	40	5,170		(8		)	NM	NM
Total	$	4,755,007	$	1,319,562						$	5,170	$	(8	)



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,203,221	$	583,486		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	731,312		186,040			1.9%	40	-	75	—		—			NA	NA
Distribution	1,986,032		365,299			2.3%	30	-	65	—		—			NA	NA
CWIP	175,890		(15,138		)	NM	NM			—		—			NA	NA
Other	387,856		203,841			4.1%	5	-	40	5,170		(6		)	NM	NM
Total	$	4,484,311	$	1,323,528						$	5,170	$	(6	)



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	35	-	70	NA	NA
Transmission	1.9%	40	-	75	NA	NA
Distribution	2.4%	30	-	65	NA	NA
CWIP	NM	NM			NA	NA
Other	6.6%	5	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



SWEPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,864,543	$	1,101,244		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,300,729		328,783			2.2%	50	-	70	—		—		NA	NA
Distribution	1,894,572		576,808			2.7%	25	-	65	—		—		NA	NA
CWIP (a)	471,689		(8,454		)	NM	NM			291		—		NA	NA
Other	587,027		361,892			4.8%	7	-	51	291,726		143,017		NM	NM
Total	$	8,118,560	$	2,360,273						$	292,017	$	143,017



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,764,429	$	1,062,166		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,165,167		312,567			2.3%	50	-	70	—		—		NA	NA
Distribution	1,843,912		563,087			2.6%	25	-	65	—		—		NA	NA
CWIP (a)	281,849		(7,355		)	NM	NM			—		—		NA	NA
Other	574,131		326,871			5.0%	7	-	51	295,099		134,316		NM	NM
Total	$	7,629,488	$	2,257,336						$	295,099	$	134,316



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation (a)	2.2%	35	-	65	NA	NA
Transmission	2.3%	50	-	70	NA	NA
Distribution	2.6%	25	-	65	NA	NA
CWIP (a)	NM	NM			NA	NA
Other	6.6%	7	-	47	NM	NM


(a)	SWEPCo's regulated section includes amounts related to SWEPCo's Arkansas jurisdictional share of the Turk Plant.


NA	Not applicable.


NM	Not meaningful.

Asset Retirement Obligations (ARO)

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO by Registrant Subsidiary:



Company	ARO as of December 31, 2013		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates		Contribution/ (Distribution) of OPCo Generation Assets		ARO as of December 31, 2014
(in thousands)
APCo (a)(d)	$	152,607	$	9,081	$	—	$	(23,992	)	$	10,681	$	—	$	148,377
I&M (a)(b)(d)	1,255,184		60,005		—		(1,380		)	28,740		—		1,342,549
OPCo (a)(d)	1,297		80		—		(26		)	10		—		1,361
PSO (a)(d)	22,928		1,786		—		(749		)	14,055		—		38,020
SWEPCo (a)(c)(d)	87,630		5,156		—		(1,102		)	2,710		—		94,394



Company	ARO as of December 31, 2012		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates			Contribution/ (Distribution) of OPCo Generation Assets			ARO as of December 31, 2013
(in thousands)
APCo (a)(d)	$	115,168	$	7,343	$	—	$	(7,298	)	$	7,083		$	30,311		$	152,607
I&M (a)(b)(d)	1,192,313		72,658		—		(635		)	(9,152		)	—			1,255,184
OPCo (a)(d)	269,940		14,957		158		(9,788		)	53,208			(327,178		)	1,297
PSO (a)(d)	21,999		1,703		—		(755		)	(19		)	—			22,928
SWEPCo (a)(c)(d)	78,017		4,912		4,191		(2,699		)	3,209			—			87,630


(a)	Includes ARO related to ash disposal facilities.


(b)	Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.2 billion as of December 31, 2014 and 2013.


(c)	Includes ARO related to Sabine and DHLC.


(d)	Includes ARO related to asbestos removal.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

The Registrant Subsidiaries’ amounts of allowance for equity funds used during construction are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	7,053	$	2,353	$	1,684
I&M	18,873		19,943		9,724
OPCo	6,913		4,961		3,492
PSO	3,071		4,187		2,007
SWEPCo	11,947		7,338		57,054

The Registrant Subsidiaries’ amounts of allowance for borrowed funds used during construction, including capitalized interest, are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	3,810	$	1,522	$	1,347
I&M	8,015		9,752		4,717
OPCo	4,436		10,102		9,046
PSO	1,792		2,272		1,098
SWEPCo	6,949		4,262		48,499

Jointly-owned Electric Facilities



				Company’s Share as of December 31, 2014
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50.0	%	$	801,536	$	119,921	$	492,184

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	94,678	$	2,558	$	57,490

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	329,706	$	3,739	$	201,321
Flint Creek Generating Station, Unit 1 (d)	Coal	50.0	%	125,114		119,629		67,948
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	531,064		36,490		381,058
Turk Generating Plant (d)	Coal	73.33	%	1,647,005		889		69,820
Total				$	2,632,889	$	160,747	$	720,147



				Company’s Share as of December 31, 2013
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50	%	$	797,485	$	54,577	$	471,787

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	93,555	$	1,844	$	57,576

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	261,685	$	47,131	$	197,720
Flint Creek Generating Station, Unit 1 (d)	Coal	50	%	122,566		54,281		65,546
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	519,158		28,833		375,718
Turk Generating Plant (d)	Coal	73.33	%	1,638,044		13,081		35,455
Total				2,541,453		143,326		674,439


(a)	Operated by I&M.


(b)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(c)	Operated by CLECO, a nonaffiliated company.


(d)	Operated by SWEPCo.


(e)	Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the "Rockport Lease" section of Note 13.

Ohio Power Co [Member]

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization



APCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,824,029	$	2,433,231		3.1%	40	-	121	$	—	$	—	NA	NA
Transmission	2,228,029		507,542			1.7%	15	-	87	—		—		NA	NA
Distribution	3,258,306		722,665			3.5%	13	-	57	—		—		NA	NA
CWIP	321,495		(19,405		)	NM	NM			—		—		NA	NA
Other	339,175		167,171			6.9%	24	-	55	34,345		12,460		NM	NM
Total	$	12,971,034	$	3,811,204						$	34,345	$	12,460



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,745,172	$	2,306,545		3.0%	40	-	121	$	—	$	—	NA	NA
Transmission	2,160,660		490,143			1.6%	25	-	87	—		—		NA	NA
Distribution	3,139,150		674,351			3.5%	11	-	52	—		—		NA	NA
CWIP	184,701		(19,297		)	NM	NM			—		—		NA	NA
Other	323,758		153,797			7.3%	24	-	55	33,759		12,451		NM	NM
Total	$	12,553,441	$	3,605,539						$	33,759	$	12,451



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	3.0%	40	-	121	NA	NA
Transmission	1.6%	25	-	87	NA	NA
Distribution	3.4%	13	-	57	NA	NA
CWIP	NM	NM			NA	NA
Other	6.8%	24	-	55	NM	NM


NA	Not applicable.


NM	Not meaningful.



I&M

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,741,831	$	1,855,162		2.0%	59	-	132	$	—	$	—	NA	NA
Transmission	1,358,419		432,927			1.7%	50	-	75	—		—		NA	NA
Distribution	1,698,409		413,040			2.8%	15	-	70	—		—		NA	NA
CWIP	537,237		(27,858		)	NM	NM			—		—		NA	NA
Other	1,342,813		628,991			6.1%	14	-	45	148,007		108,079		NM	NM
Total	$	8,678,709	$	3,302,262						$	148,007	$	108,079



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,577,906	$	1,887,333		1.9%	59	-	132	$	—	$	—	NA	NA
Transmission	1,304,225		420,295			1.5%	50	-	75	—		—		NA	NA
Distribution	1,625,057		390,014			2.8%	15	-	70	—		—		NA	NA
CWIP	427,164		(18,824		)	NM	NM			—		—		NA	NA
Other	1,268,597		509,426			4.9%	14	-	45	152,764		111,105		NM	NM
Total	$	8,202,949	$	3,188,244						$	152,764	$	111,105



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	59	-	132	NA	NA
Transmission	1.5%	46	-	75	NA	NA
Distribution	2.5%	14	-	70	NA	NA
CWIP	NM	NM			NA	NA
Other	9.6%	14	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



OPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,104,613	$	844,353		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	4,087,601		1,050,888			2.7%	7	-	57	—		—		NA	NA
CWIP	218,667		(39,218		)	NM	NM			—		—		NA	NA
Other	380,453		181,258			7.0%	7	-	50	10,395		839		NM	NM
Total	$	6,791,334	$	2,037,281						$	10,395	$	839



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,011,289	$	814,849		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	3,877,532		1,023,313			2.7%	12	-	60	—		—		NA	NA
CWIP	185,428		(29,825		)	NM	NM			—		—		NA	NA
Other	354,195		163,894			7.5%	25	-	50	10,378		811		NM	NM
Total	$	6,428,444	$	1,972,231						$	10,378	$	811

2012

Regulated

Nonregulated

Functional Class of Property

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

(in years)

Generation

3.0%

Transmission

2.3%

Distribution

2.7%

CWIP

Other

7.3%


NA	Not applicable.


NM	Not meaningful.



PSO

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,264,724	$	585,653		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	788,911		161,056			1.9%	40	-	75	—		—			NA	NA
Distribution	2,080,221		366,325			2.4%	30	-	65	—		—			NA	NA
CWIP	204,753		(11,055		)	NM	NM			—		—			NA	NA
Other	416,398		217,583			4.1%	5	-	40	5,170		(8		)	NM	NM
Total	$	4,755,007	$	1,319,562						$	5,170	$	(8	)



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,203,221	$	583,486		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	731,312		186,040			1.9%	40	-	75	—		—			NA	NA
Distribution	1,986,032		365,299			2.3%	30	-	65	—		—			NA	NA
CWIP	175,890		(15,138		)	NM	NM			—		—			NA	NA
Other	387,856		203,841			4.1%	5	-	40	5,170		(6		)	NM	NM
Total	$	4,484,311	$	1,323,528						$	5,170	$	(6	)



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	35	-	70	NA	NA
Transmission	1.9%	40	-	75	NA	NA
Distribution	2.4%	30	-	65	NA	NA
CWIP	NM	NM			NA	NA
Other	6.6%	5	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



SWEPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,864,543	$	1,101,244		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,300,729		328,783			2.2%	50	-	70	—		—		NA	NA
Distribution	1,894,572		576,808			2.7%	25	-	65	—		—		NA	NA
CWIP (a)	471,689		(8,454		)	NM	NM			291		—		NA	NA
Other	587,027		361,892			4.8%	7	-	51	291,726		143,017		NM	NM
Total	$	8,118,560	$	2,360,273						$	292,017	$	143,017



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,764,429	$	1,062,166		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,165,167		312,567			2.3%	50	-	70	—		—		NA	NA
Distribution	1,843,912		563,087			2.6%	25	-	65	—		—		NA	NA
CWIP (a)	281,849		(7,355		)	NM	NM			—		—		NA	NA
Other	574,131		326,871			5.0%	7	-	51	295,099		134,316		NM	NM
Total	$	7,629,488	$	2,257,336						$	295,099	$	134,316



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation (a)	2.2%	35	-	65	NA	NA
Transmission	2.3%	50	-	70	NA	NA
Distribution	2.6%	25	-	65	NA	NA
CWIP (a)	NM	NM			NA	NA
Other	6.6%	7	-	47	NM	NM


(a)	SWEPCo's regulated section includes amounts related to SWEPCo's Arkansas jurisdictional share of the Turk Plant.


NA	Not applicable.


NM	Not meaningful.

Asset Retirement Obligations (ARO)

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO by Registrant Subsidiary:



Company	ARO as of December 31, 2013		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates		Contribution/ (Distribution) of OPCo Generation Assets		ARO as of December 31, 2014
(in thousands)
APCo (a)(d)	$	152,607	$	9,081	$	—	$	(23,992	)	$	10,681	$	—	$	148,377
I&M (a)(b)(d)	1,255,184		60,005		—		(1,380		)	28,740		—		1,342,549
OPCo (a)(d)	1,297		80		—		(26		)	10		—		1,361
PSO (a)(d)	22,928		1,786		—		(749		)	14,055		—		38,020
SWEPCo (a)(c)(d)	87,630		5,156		—		(1,102		)	2,710		—		94,394



Company	ARO as of December 31, 2012		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates			Contribution/ (Distribution) of OPCo Generation Assets			ARO as of December 31, 2013
(in thousands)
APCo (a)(d)	$	115,168	$	7,343	$	—	$	(7,298	)	$	7,083		$	30,311		$	152,607
I&M (a)(b)(d)	1,192,313		72,658		—		(635		)	(9,152		)	—			1,255,184
OPCo (a)(d)	269,940		14,957		158		(9,788		)	53,208			(327,178		)	1,297
PSO (a)(d)	21,999		1,703		—		(755		)	(19		)	—			22,928
SWEPCo (a)(c)(d)	78,017		4,912		4,191		(2,699		)	3,209			—			87,630


(a)	Includes ARO related to ash disposal facilities.


(b)	Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.2 billion as of December 31, 2014 and 2013.


(c)	Includes ARO related to Sabine and DHLC.


(d)	Includes ARO related to asbestos removal.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

The Registrant Subsidiaries’ amounts of allowance for equity funds used during construction are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	7,053	$	2,353	$	1,684
I&M	18,873		19,943		9,724
OPCo	6,913		4,961		3,492
PSO	3,071		4,187		2,007
SWEPCo	11,947		7,338		57,054

The Registrant Subsidiaries’ amounts of allowance for borrowed funds used during construction, including capitalized interest, are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	3,810	$	1,522	$	1,347
I&M	8,015		9,752		4,717
OPCo	4,436		10,102		9,046
PSO	1,792		2,272		1,098
SWEPCo	6,949		4,262		48,499

Jointly-owned Electric Facilities



				Company’s Share as of December 31, 2014
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50.0	%	$	801,536	$	119,921	$	492,184

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	94,678	$	2,558	$	57,490

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	329,706	$	3,739	$	201,321
Flint Creek Generating Station, Unit 1 (d)	Coal	50.0	%	125,114		119,629		67,948
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	531,064		36,490		381,058
Turk Generating Plant (d)	Coal	73.33	%	1,647,005		889		69,820
Total				$	2,632,889	$	160,747	$	720,147



				Company’s Share as of December 31, 2013
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50	%	$	797,485	$	54,577	$	471,787

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	93,555	$	1,844	$	57,576

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	261,685	$	47,131	$	197,720
Flint Creek Generating Station, Unit 1 (d)	Coal	50	%	122,566		54,281		65,546
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	519,158		28,833		375,718
Turk Generating Plant (d)	Coal	73.33	%	1,638,044		13,081		35,455
Total				2,541,453		143,326		674,439


(a)	Operated by I&M.


(b)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(c)	Operated by CLECO, a nonaffiliated company.


(d)	Operated by SWEPCo.


(e)	Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the "Rockport Lease" section of Note 13.

Public Service Co Of Oklahoma [Member]

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization



APCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,824,029	$	2,433,231		3.1%	40	-	121	$	—	$	—	NA	NA
Transmission	2,228,029		507,542			1.7%	15	-	87	—		—		NA	NA
Distribution	3,258,306		722,665			3.5%	13	-	57	—		—		NA	NA
CWIP	321,495		(19,405		)	NM	NM			—		—		NA	NA
Other	339,175		167,171			6.9%	24	-	55	34,345		12,460		NM	NM
Total	$	12,971,034	$	3,811,204						$	34,345	$	12,460



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,745,172	$	2,306,545		3.0%	40	-	121	$	—	$	—	NA	NA
Transmission	2,160,660		490,143			1.6%	25	-	87	—		—		NA	NA
Distribution	3,139,150		674,351			3.5%	11	-	52	—		—		NA	NA
CWIP	184,701		(19,297		)	NM	NM			—		—		NA	NA
Other	323,758		153,797			7.3%	24	-	55	33,759		12,451		NM	NM
Total	$	12,553,441	$	3,605,539						$	33,759	$	12,451



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	3.0%	40	-	121	NA	NA
Transmission	1.6%	25	-	87	NA	NA
Distribution	3.4%	13	-	57	NA	NA
CWIP	NM	NM			NA	NA
Other	6.8%	24	-	55	NM	NM


NA	Not applicable.


NM	Not meaningful.



I&M

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,741,831	$	1,855,162		2.0%	59	-	132	$	—	$	—	NA	NA
Transmission	1,358,419		432,927			1.7%	50	-	75	—		—		NA	NA
Distribution	1,698,409		413,040			2.8%	15	-	70	—		—		NA	NA
CWIP	537,237		(27,858		)	NM	NM			—		—		NA	NA
Other	1,342,813		628,991			6.1%	14	-	45	148,007		108,079		NM	NM
Total	$	8,678,709	$	3,302,262						$	148,007	$	108,079



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,577,906	$	1,887,333		1.9%	59	-	132	$	—	$	—	NA	NA
Transmission	1,304,225		420,295			1.5%	50	-	75	—		—		NA	NA
Distribution	1,625,057		390,014			2.8%	15	-	70	—		—		NA	NA
CWIP	427,164		(18,824		)	NM	NM			—		—		NA	NA
Other	1,268,597		509,426			4.9%	14	-	45	152,764		111,105		NM	NM
Total	$	8,202,949	$	3,188,244						$	152,764	$	111,105



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	59	-	132	NA	NA
Transmission	1.5%	46	-	75	NA	NA
Distribution	2.5%	14	-	70	NA	NA
CWIP	NM	NM			NA	NA
Other	9.6%	14	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



OPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,104,613	$	844,353		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	4,087,601		1,050,888			2.7%	7	-	57	—		—		NA	NA
CWIP	218,667		(39,218		)	NM	NM			—		—		NA	NA
Other	380,453		181,258			7.0%	7	-	50	10,395		839		NM	NM
Total	$	6,791,334	$	2,037,281						$	10,395	$	839



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,011,289	$	814,849		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	3,877,532		1,023,313			2.7%	12	-	60	—		—		NA	NA
CWIP	185,428		(29,825		)	NM	NM			—		—		NA	NA
Other	354,195		163,894			7.5%	25	-	50	10,378		811		NM	NM
Total	$	6,428,444	$	1,972,231						$	10,378	$	811

2012

Regulated

Nonregulated

Functional Class of Property

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

(in years)

Generation

3.0%

Transmission

2.3%

Distribution

2.7%

CWIP

Other

7.3%


NA	Not applicable.


NM	Not meaningful.



PSO

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,264,724	$	585,653		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	788,911		161,056			1.9%	40	-	75	—		—			NA	NA
Distribution	2,080,221		366,325			2.4%	30	-	65	—		—			NA	NA
CWIP	204,753		(11,055		)	NM	NM			—		—			NA	NA
Other	416,398		217,583			4.1%	5	-	40	5,170		(8		)	NM	NM
Total	$	4,755,007	$	1,319,562						$	5,170	$	(8	)



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,203,221	$	583,486		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	731,312		186,040			1.9%	40	-	75	—		—			NA	NA
Distribution	1,986,032		365,299			2.3%	30	-	65	—		—			NA	NA
CWIP	175,890		(15,138		)	NM	NM			—		—			NA	NA
Other	387,856		203,841			4.1%	5	-	40	5,170		(6		)	NM	NM
Total	$	4,484,311	$	1,323,528						$	5,170	$	(6	)



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	35	-	70	NA	NA
Transmission	1.9%	40	-	75	NA	NA
Distribution	2.4%	30	-	65	NA	NA
CWIP	NM	NM			NA	NA
Other	6.6%	5	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



SWEPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,864,543	$	1,101,244		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,300,729		328,783			2.2%	50	-	70	—		—		NA	NA
Distribution	1,894,572		576,808			2.7%	25	-	65	—		—		NA	NA
CWIP (a)	471,689		(8,454		)	NM	NM			291		—		NA	NA
Other	587,027		361,892			4.8%	7	-	51	291,726		143,017		NM	NM
Total	$	8,118,560	$	2,360,273						$	292,017	$	143,017



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,764,429	$	1,062,166		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,165,167		312,567			2.3%	50	-	70	—		—		NA	NA
Distribution	1,843,912		563,087			2.6%	25	-	65	—		—		NA	NA
CWIP (a)	281,849		(7,355		)	NM	NM			—		—		NA	NA
Other	574,131		326,871			5.0%	7	-	51	295,099		134,316		NM	NM
Total	$	7,629,488	$	2,257,336						$	295,099	$	134,316



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation (a)	2.2%	35	-	65	NA	NA
Transmission	2.3%	50	-	70	NA	NA
Distribution	2.6%	25	-	65	NA	NA
CWIP (a)	NM	NM			NA	NA
Other	6.6%	7	-	47	NM	NM


(a)	SWEPCo's regulated section includes amounts related to SWEPCo's Arkansas jurisdictional share of the Turk Plant.


NA	Not applicable.


NM	Not meaningful.

Asset Retirement Obligations (ARO)

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO by Registrant Subsidiary:



Company	ARO as of December 31, 2013		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates		Contribution/ (Distribution) of OPCo Generation Assets		ARO as of December 31, 2014
(in thousands)
APCo (a)(d)	$	152,607	$	9,081	$	—	$	(23,992	)	$	10,681	$	—	$	148,377
I&M (a)(b)(d)	1,255,184		60,005		—		(1,380		)	28,740		—		1,342,549
OPCo (a)(d)	1,297		80		—		(26		)	10		—		1,361
PSO (a)(d)	22,928		1,786		—		(749		)	14,055		—		38,020
SWEPCo (a)(c)(d)	87,630		5,156		—		(1,102		)	2,710		—		94,394



Company	ARO as of December 31, 2012		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates			Contribution/ (Distribution) of OPCo Generation Assets			ARO as of December 31, 2013
(in thousands)
APCo (a)(d)	$	115,168	$	7,343	$	—	$	(7,298	)	$	7,083		$	30,311		$	152,607
I&M (a)(b)(d)	1,192,313		72,658		—		(635		)	(9,152		)	—			1,255,184
OPCo (a)(d)	269,940		14,957		158		(9,788		)	53,208			(327,178		)	1,297
PSO (a)(d)	21,999		1,703		—		(755		)	(19		)	—			22,928
SWEPCo (a)(c)(d)	78,017		4,912		4,191		(2,699		)	3,209			—			87,630


(a)	Includes ARO related to ash disposal facilities.


(b)	Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.2 billion as of December 31, 2014 and 2013.


(c)	Includes ARO related to Sabine and DHLC.


(d)	Includes ARO related to asbestos removal.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

The Registrant Subsidiaries’ amounts of allowance for equity funds used during construction are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	7,053	$	2,353	$	1,684
I&M	18,873		19,943		9,724
OPCo	6,913		4,961		3,492
PSO	3,071		4,187		2,007
SWEPCo	11,947		7,338		57,054

The Registrant Subsidiaries’ amounts of allowance for borrowed funds used during construction, including capitalized interest, are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	3,810	$	1,522	$	1,347
I&M	8,015		9,752		4,717
OPCo	4,436		10,102		9,046
PSO	1,792		2,272		1,098
SWEPCo	6,949		4,262		48,499

Jointly-owned Electric Facilities



				Company’s Share as of December 31, 2014
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50.0	%	$	801,536	$	119,921	$	492,184

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	94,678	$	2,558	$	57,490

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	329,706	$	3,739	$	201,321
Flint Creek Generating Station, Unit 1 (d)	Coal	50.0	%	125,114		119,629		67,948
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	531,064		36,490		381,058
Turk Generating Plant (d)	Coal	73.33	%	1,647,005		889		69,820
Total				$	2,632,889	$	160,747	$	720,147



				Company’s Share as of December 31, 2013
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50	%	$	797,485	$	54,577	$	471,787

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	93,555	$	1,844	$	57,576

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	261,685	$	47,131	$	197,720
Flint Creek Generating Station, Unit 1 (d)	Coal	50	%	122,566		54,281		65,546
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	519,158		28,833		375,718
Turk Generating Plant (d)	Coal	73.33	%	1,638,044		13,081		35,455
Total				2,541,453		143,326		674,439


(a)	Operated by I&M.


(b)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(c)	Operated by CLECO, a nonaffiliated company.


(d)	Operated by SWEPCo.


(e)	Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the "Rockport Lease" section of Note 13.

Southwestern Electric Power Co [Member]

Property, Plant and Equipment Disclosure [Text Block]

PROPERTY, PLANT AND EQUIPMENT

Depreciation, Depletion and Amortization



APCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,824,029	$	2,433,231		3.1%	40	-	121	$	—	$	—	NA	NA
Transmission	2,228,029		507,542			1.7%	15	-	87	—		—		NA	NA
Distribution	3,258,306		722,665			3.5%	13	-	57	—		—		NA	NA
CWIP	321,495		(19,405		)	NM	NM			—		—		NA	NA
Other	339,175		167,171			6.9%	24	-	55	34,345		12,460		NM	NM
Total	$	12,971,034	$	3,811,204						$	34,345	$	12,460



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	6,745,172	$	2,306,545		3.0%	40	-	121	$	—	$	—	NA	NA
Transmission	2,160,660		490,143			1.6%	25	-	87	—		—		NA	NA
Distribution	3,139,150		674,351			3.5%	11	-	52	—		—		NA	NA
CWIP	184,701		(19,297		)	NM	NM			—		—		NA	NA
Other	323,758		153,797			7.3%	24	-	55	33,759		12,451		NM	NM
Total	$	12,553,441	$	3,605,539						$	33,759	$	12,451



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	3.0%	40	-	121	NA	NA
Transmission	1.6%	25	-	87	NA	NA
Distribution	3.4%	13	-	57	NA	NA
CWIP	NM	NM			NA	NA
Other	6.8%	24	-	55	NM	NM


NA	Not applicable.


NM	Not meaningful.



I&M

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,741,831	$	1,855,162		2.0%	59	-	132	$	—	$	—	NA	NA
Transmission	1,358,419		432,927			1.7%	50	-	75	—		—		NA	NA
Distribution	1,698,409		413,040			2.8%	15	-	70	—		—		NA	NA
CWIP	537,237		(27,858		)	NM	NM			—		—		NA	NA
Other	1,342,813		628,991			6.1%	14	-	45	148,007		108,079		NM	NM
Total	$	8,678,709	$	3,302,262						$	148,007	$	108,079



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation	$	3,577,906	$	1,887,333		1.9%	59	-	132	$	—	$	—	NA	NA
Transmission	1,304,225		420,295			1.5%	50	-	75	—		—		NA	NA
Distribution	1,625,057		390,014			2.8%	15	-	70	—		—		NA	NA
CWIP	427,164		(18,824		)	NM	NM			—		—		NA	NA
Other	1,268,597		509,426			4.9%	14	-	45	152,764		111,105		NM	NM
Total	$	8,202,949	$	3,188,244						$	152,764	$	111,105



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	59	-	132	NA	NA
Transmission	1.5%	46	-	75	NA	NA
Distribution	2.5%	14	-	70	NA	NA
CWIP	NM	NM			NA	NA
Other	9.6%	14	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



OPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,104,613	$	844,353		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	4,087,601		1,050,888			2.7%	7	-	57	—		—		NA	NA
CWIP	218,667		(39,218		)	NM	NM			—		—		NA	NA
Other	380,453		181,258			7.0%	7	-	50	10,395		839		NM	NM
Total	$	6,791,334	$	2,037,281						$	10,395	$	839



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Transmission	$	2,011,289	$	814,849		2.3%	39	-	60	$	—	$	—	NA	NA
Distribution	3,877,532		1,023,313			2.7%	12	-	60	—		—		NA	NA
CWIP	185,428		(29,825		)	NM	NM			—		—		NA	NA
Other	354,195		163,894			7.5%	25	-	50	10,378		811		NM	NM
Total	$	6,428,444	$	1,972,231						$	10,378	$	811

2012

Regulated

Nonregulated

Functional Class of Property

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

Annual Composite
Depreciation Rate

Depreciable
Life Ranges

(in years)

Generation

3.0%

Transmission

2.3%

Distribution

2.7%

CWIP

Other

7.3%


NA	Not applicable.


NM	Not meaningful.



PSO

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,264,724	$	585,653		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	788,911		161,056			1.9%	40	-	75	—		—			NA	NA
Distribution	2,080,221		366,325			2.4%	30	-	65	—		—			NA	NA
CWIP	204,753		(11,055		)	NM	NM			—		—			NA	NA
Other	416,398		217,583			4.1%	5	-	40	5,170		(8		)	NM	NM
Total	$	4,755,007	$	1,319,562						$	5,170	$	(8	)



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)						(in years)
Generation	$	1,203,221	$	583,486		1.7%	35	-	70	$	—	$	—		NA	NA
Transmission	731,312		186,040			1.9%	40	-	75	—		—			NA	NA
Distribution	1,986,032		365,299			2.3%	30	-	65	—		—			NA	NA
CWIP	175,890		(15,138		)	NM	NM			—		—			NA	NA
Other	387,856		203,841			4.1%	5	-	40	5,170		(6		)	NM	NM
Total	$	4,484,311	$	1,323,528						$	5,170	$	(6	)



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation	1.7%	35	-	70	NA	NA
Transmission	1.9%	40	-	75	NA	NA
Distribution	2.4%	30	-	65	NA	NA
CWIP	NM	NM			NA	NA
Other	6.6%	5	-	40	NM	NM


NA	Not applicable.


NM	Not meaningful.



SWEPCo

2014	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,864,543	$	1,101,244		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,300,729		328,783			2.2%	50	-	70	—		—		NA	NA
Distribution	1,894,572		576,808			2.7%	25	-	65	—		—		NA	NA
CWIP (a)	471,689		(8,454		)	NM	NM			291		—		NA	NA
Other	587,027		361,892			4.8%	7	-	51	291,726		143,017		NM	NM
Total	$	8,118,560	$	2,360,273						$	292,017	$	143,017



2013	Regulated									Nonregulated
Functional Class of Property	Property, Plant and Equipment		Accumulated Depreciation			Annual Composite Depreciation Rate	Depreciable Life Ranges			Property, Plant and Equipment		Accumulated Depreciation		Annual Composite Depreciation Rate	Depreciable Life Ranges
	(in thousands)						(in years)			(in thousands)					(in years)
Generation (a)	$	3,764,429	$	1,062,166		2.2%	40	-	70	$	—	$	—	NA	NA
Transmission	1,165,167		312,567			2.3%	50	-	70	—		—		NA	NA
Distribution	1,843,912		563,087			2.6%	25	-	65	—		—		NA	NA
CWIP (a)	281,849		(7,355		)	NM	NM			—		—		NA	NA
Other	574,131		326,871			5.0%	7	-	51	295,099		134,316		NM	NM
Total	$	7,629,488	$	2,257,336						$	295,099	$	134,316



2012	Regulated				Nonregulated
Functional Class of Property	Annual Composite Depreciation Rate	Depreciable Life Ranges			Annual Composite Depreciation Rate	Depreciable Life Ranges
		(in years)				(in years)
Generation (a)	2.2%	35	-	65	NA	NA
Transmission	2.3%	50	-	70	NA	NA
Distribution	2.6%	25	-	65	NA	NA
CWIP (a)	NM	NM			NA	NA
Other	6.6%	7	-	47	NM	NM


(a)	SWEPCo's regulated section includes amounts related to SWEPCo's Arkansas jurisdictional share of the Turk Plant.


NA	Not applicable.


NM	Not meaningful.

Asset Retirement Obligations (ARO)

The following is a reconciliation of the 2014 and 2013 aggregate carrying amounts of ARO by Registrant Subsidiary:



Company	ARO as of December 31, 2013		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates		Contribution/ (Distribution) of OPCo Generation Assets		ARO as of December 31, 2014
(in thousands)
APCo (a)(d)	$	152,607	$	9,081	$	—	$	(23,992	)	$	10,681	$	—	$	148,377
I&M (a)(b)(d)	1,255,184		60,005		—		(1,380		)	28,740		—		1,342,549
OPCo (a)(d)	1,297		80		—		(26		)	10		—		1,361
PSO (a)(d)	22,928		1,786		—		(749		)	14,055		—		38,020
SWEPCo (a)(c)(d)	87,630		5,156		—		(1,102		)	2,710		—		94,394



Company	ARO as of December 31, 2012		Accretion Expense		Liabilities Incurred		Liabilities Settled			Revisions in Cash Flow Estimates			Contribution/ (Distribution) of OPCo Generation Assets			ARO as of December 31, 2013
(in thousands)
APCo (a)(d)	$	115,168	$	7,343	$	—	$	(7,298	)	$	7,083		$	30,311		$	152,607
I&M (a)(b)(d)	1,192,313		72,658		—		(635		)	(9,152		)	—			1,255,184
OPCo (a)(d)	269,940		14,957		158		(9,788		)	53,208			(327,178		)	1,297
PSO (a)(d)	21,999		1,703		—		(755		)	(19		)	—			22,928
SWEPCo (a)(c)(d)	78,017		4,912		4,191		(2,699		)	3,209			—			87,630


(a)	Includes ARO related to ash disposal facilities.


(b)	Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.3 billion and $1.2 billion as of December 31, 2014 and 2013.


(c)	Includes ARO related to Sabine and DHLC.


(d)	Includes ARO related to asbestos removal.

Allowance for Funds Used During Construction (AFUDC) and Interest Capitalization

The Registrant Subsidiaries’ amounts of allowance for equity funds used during construction are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	7,053	$	2,353	$	1,684
I&M	18,873		19,943		9,724
OPCo	6,913		4,961		3,492
PSO	3,071		4,187		2,007
SWEPCo	11,947		7,338		57,054

The Registrant Subsidiaries’ amounts of allowance for borrowed funds used during construction, including capitalized interest, are summarized in the following table:



	Years Ended December 31,
Company	2014		2013		2012
	(in thousands)
APCo	$	3,810	$	1,522	$	1,347
I&M	8,015		9,752		4,717
OPCo	4,436		10,102		9,046
PSO	1,792		2,272		1,098
SWEPCo	6,949		4,262		48,499

Jointly-owned Electric Facilities



				Company’s Share as of December 31, 2014
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50.0	%	$	801,536	$	119,921	$	492,184

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	94,678	$	2,558	$	57,490

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	329,706	$	3,739	$	201,321
Flint Creek Generating Station, Unit 1 (d)	Coal	50.0	%	125,114		119,629		67,948
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	531,064		36,490		381,058
Turk Generating Plant (d)	Coal	73.33	%	1,647,005		889		69,820
Total				$	2,632,889	$	160,747	$	720,147



				Company’s Share as of December 31, 2013
Company	Fuel Type	Percent of Ownership		Utility Plant in Service		Construction Work in Progress		Accumulated Depreciation
				(in thousands)
I&M
Rockport Generating Plant (a)(e)	Coal	50	%	$	797,485	$	54,577	$	471,787

PSO
Oklaunion Generating Station, Unit 1 (b)	Coal	15.6	%	$	93,555	$	1,844	$	57,576

SWEPCo
Dolet Hills Generating Station, Unit 1 (c)	Lignite	40.2	%	$	261,685	$	47,131	$	197,720
Flint Creek Generating Station, Unit 1 (d)	Coal	50	%	122,566		54,281		65,546
Pirkey Generating Station, Unit 1 (d)	Lignite	85.9	%	519,158		28,833		375,718
Turk Generating Plant (d)	Coal	73.33	%	1,638,044		13,081		35,455
Total				2,541,453		143,326		674,439


(a)	Operated by I&M.


(b)	Operated by PSO and also jointly-owned (54.7%) by TNC.


(c)	Operated by CLECO, a nonaffiliated company.


(d)	Operated by SWEPCo.


(e)	Amounts include I&M's 50% ownership of both Unit 1 and capital additions for Unit 2. Unit 2 is subject to an operating lease with a nonaffiliated company. See the "Rockport Lease" section of Note 13.

- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

+ References+ Details