Rate Matters (Tables)

6 Months Ended

Jun. 30, 2015

Regulatory Assets Not Yet Being Recovered

Regulatory Assets Pending Final Regulatory Approval

	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Storm Related Costs	$	20	$	20
Material and Supplies Related to Retired Plants	19		—
West Virginia Vegetation Management Program	—		20
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	51		—
Virginia Demand Response Program Costs	11		9
Ormet Special Rate Recovery Mechanism	10		10
Storm Related Costs	3		100
Carbon Capture and Storage Product Validation Facility	—		13
IGCC Pre-Construction Costs	—		11
Other Regulatory Assets Pending Final Regulatory Approval	23		43
Total Regulatory Assets Pending Final Regulatory Approval	$	137	$	226

Appalachian Power Co [Member]

Regulatory Assets Not Yet Being Recovered

	APCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	7,588	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	24,399		—
Demand Response Program Costs – Virginia	10,781		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Storm Related Costs – West Virginia	—		65,206
Carbon Capture and Storage Product Validation Facility – West Virginia, FERC	—		13,264
IGCC Pre-Construction Costs – West Virginia, FERC	—		10,838
Expanded Net Energy Charge – Coal Inventory	—		3,421
Expanded Net Energy Charge – Construction Surcharge	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	168		168
Total Regulatory Assets Pending Final Regulatory Approval	$	44,886	$	125,748

	I&M
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,722	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,169		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	2,721		1,222
Storm Related Costs – Indiana	857		1,074
Other Regulatory Assets Pending Final Regulatory Approval	547		860
Total Regulatory Assets Pending Final Regulatory Approval	$	54,992	$	13,649

	OPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Ormet Special Rate Recovery Mechanism	$	10,483	$	10,483
Other Regulatory Assets Pending Final Regulatory Approval	44		—
Total Regulatory Assets Pending Final Regulatory Approval	$	10,527	$	10,483

	PSO
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Storm Related Costs	$	—	$	16,614
Other Regulatory Assets Pending Final Regulatory Approval	—		1,079
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	17,693

	SWEPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Rate Case Expenses	$	—	$	8,126
Shipe Road Transmission Project	3,022		2,287
Asset Retirement Obligation	1,320		1,144
Other Regulatory Assets Pending Final Regulatory Approval	558		558
Total Regulatory Assets Pending Final Regulatory Approval	$	4,900	$	12,115

Indiana Michigan Power Co [Member]

Regulatory Assets Not Yet Being Recovered

	APCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	7,588	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	24,399		—
Demand Response Program Costs – Virginia	10,781		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Storm Related Costs – West Virginia	—		65,206
Carbon Capture and Storage Product Validation Facility – West Virginia, FERC	—		13,264
IGCC Pre-Construction Costs – West Virginia, FERC	—		10,838
Expanded Net Energy Charge – Coal Inventory	—		3,421
Expanded Net Energy Charge – Construction Surcharge	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	168		168
Total Regulatory Assets Pending Final Regulatory Approval	$	44,886	$	125,748

	I&M
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,722	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,169		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	2,721		1,222
Storm Related Costs – Indiana	857		1,074
Other Regulatory Assets Pending Final Regulatory Approval	547		860
Total Regulatory Assets Pending Final Regulatory Approval	$	54,992	$	13,649

	OPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Ormet Special Rate Recovery Mechanism	$	10,483	$	10,483
Other Regulatory Assets Pending Final Regulatory Approval	44		—
Total Regulatory Assets Pending Final Regulatory Approval	$	10,527	$	10,483

	PSO
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Storm Related Costs	$	—	$	16,614
Other Regulatory Assets Pending Final Regulatory Approval	—		1,079
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	17,693

	SWEPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Rate Case Expenses	$	—	$	8,126
Shipe Road Transmission Project	3,022		2,287
Asset Retirement Obligation	1,320		1,144
Other Regulatory Assets Pending Final Regulatory Approval	558		558
Total Regulatory Assets Pending Final Regulatory Approval	$	4,900	$	12,115

Ohio Power Co [Member]

Regulatory Assets Not Yet Being Recovered

	APCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	7,588	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	24,399		—
Demand Response Program Costs – Virginia	10,781		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Storm Related Costs – West Virginia	—		65,206
Carbon Capture and Storage Product Validation Facility – West Virginia, FERC	—		13,264
IGCC Pre-Construction Costs – West Virginia, FERC	—		10,838
Expanded Net Energy Charge – Coal Inventory	—		3,421
Expanded Net Energy Charge – Construction Surcharge	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	168		168
Total Regulatory Assets Pending Final Regulatory Approval	$	44,886	$	125,748

	I&M
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,722	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,169		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	2,721		1,222
Storm Related Costs – Indiana	857		1,074
Other Regulatory Assets Pending Final Regulatory Approval	547		860
Total Regulatory Assets Pending Final Regulatory Approval	$	54,992	$	13,649

	OPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Ormet Special Rate Recovery Mechanism	$	10,483	$	10,483
Other Regulatory Assets Pending Final Regulatory Approval	44		—
Total Regulatory Assets Pending Final Regulatory Approval	$	10,527	$	10,483

	PSO
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Storm Related Costs	$	—	$	16,614
Other Regulatory Assets Pending Final Regulatory Approval	—		1,079
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	17,693

	SWEPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Rate Case Expenses	$	—	$	8,126
Shipe Road Transmission Project	3,022		2,287
Asset Retirement Obligation	1,320		1,144
Other Regulatory Assets Pending Final Regulatory Approval	558		558
Total Regulatory Assets Pending Final Regulatory Approval	$	4,900	$	12,115

Public Service Co Of Oklahoma [Member]

Regulatory Assets Not Yet Being Recovered

Regulatory Assets Pending Final Regulatory Approval

	APCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	7,588	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	24,399		—
Demand Response Program Costs – Virginia	10,781		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Storm Related Costs – West Virginia	—		65,206
Carbon Capture and Storage Product Validation Facility – West Virginia, FERC	—		13,264
IGCC Pre-Construction Costs – West Virginia, FERC	—		10,838
Expanded Net Energy Charge – Coal Inventory	—		3,421
Expanded Net Energy Charge – Construction Surcharge	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	168		168
Total Regulatory Assets Pending Final Regulatory Approval	$	44,886	$	125,748

	I&M
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,722	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,169		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	2,721		1,222
Storm Related Costs – Indiana	857		1,074
Other Regulatory Assets Pending Final Regulatory Approval	547		860
Total Regulatory Assets Pending Final Regulatory Approval	$	54,992	$	13,649

	OPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Ormet Special Rate Recovery Mechanism	$	10,483	$	10,483
Other Regulatory Assets Pending Final Regulatory Approval	44		—
Total Regulatory Assets Pending Final Regulatory Approval	$	10,527	$	10,483

	PSO
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Storm Related Costs	$	—	$	16,614
Other Regulatory Assets Pending Final Regulatory Approval	—		1,079
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	17,693

	SWEPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Rate Case Expenses	$	—	$	8,126
Shipe Road Transmission Project	3,022		2,287
Asset Retirement Obligation	1,320		1,144
Other Regulatory Assets Pending Final Regulatory Approval	558		558
Total Regulatory Assets Pending Final Regulatory Approval	$	4,900	$	12,115

Southwestern Electric Power Co [Member]

Regulatory Assets Not Yet Being Recovered

	APCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	7,588	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	24,399		—
Demand Response Program Costs – Virginia	10,781		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Storm Related Costs – West Virginia	—		65,206
Carbon Capture and Storage Product Validation Facility – West Virginia, FERC	—		13,264
IGCC Pre-Construction Costs – West Virginia, FERC	—		10,838
Expanded Net Energy Charge – Coal Inventory	—		3,421
Expanded Net Energy Charge – Construction Surcharge	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	168		168
Total Regulatory Assets Pending Final Regulatory Approval	$	44,886	$	125,748

	I&M
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,722	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,169		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	2,721		1,222
Storm Related Costs – Indiana	857		1,074
Other Regulatory Assets Pending Final Regulatory Approval	547		860
Total Regulatory Assets Pending Final Regulatory Approval	$	54,992	$	13,649

	OPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Ormet Special Rate Recovery Mechanism	$	10,483	$	10,483
Other Regulatory Assets Pending Final Regulatory Approval	44		—
Total Regulatory Assets Pending Final Regulatory Approval	$	10,527	$	10,483

	PSO
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Storm Related Costs	$	—	$	16,614
Other Regulatory Assets Pending Final Regulatory Approval	—		1,079
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	17,693

	SWEPCo
	June 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Rate Case Expenses	$	—	$	8,126
Shipe Road Transmission Project	3,022		2,287
Asset Retirement Obligation	1,320		1,144
Other Regulatory Assets Pending Final Regulatory Approval	558		558
Total Regulatory Assets Pending Final Regulatory Approval	$	4,900	$	12,115