Rate Matters (Tables)

9 Months Ended

Sep. 30, 2015

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Storm Related Costs	$	24	$	20
Material and Supplies Related to Retired Plants	20		—
West Virginia Vegetation Management Program	—		20
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	59		—
Virginia Peak Demand Reduction/Energy Efficiency	12		9
Ormet Special Rate Recovery Mechanism	10		10
Storm Related Costs	7		100
Carbon Capture and Storage Product Validation Facility	—		13
IGCC Pre-Construction Costs	—		11
Other Regulatory Assets Pending Final Regulatory Approval	27		43
Total Regulatory Assets Pending Final Regulatory Approval	$	159	$	226

Appalachian Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	8,592	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	32,128		—
Peak Demand Reduction/Energy Efficiency – Virginia	11,650		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Deferred Permit Fees Related to Retired Plants – West Virginia	617		—
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 – West Virginia	—		3,421
Expanded Net Energy Charge – Construction Surcharge – West Virginia	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	—		168
Total Regulatory Assets Pending Final Regulatory Approval	$	54,937	$	125,748

	I&M
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,652	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,955		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	3,445		1,222
Rockport Dry Sorbent Injection System	1,865		148
Storm Related Costs – Indiana	—		1,074
Other Regulatory Assets Pending Final Regulatory Approval	11		712
Total Regulatory Assets Pending Final Regulatory Approval	$	56,904	$	13,649

	OPCo
	September 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
Total Regulatory Assets Pending Final Regulatory Approval	$	10,483	$	10,483

	PSO
	September 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
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project	$	3,031	$	2,287
Asset Retirement Obligation	1,516		1,144
Rate Case Expenses	—		8,126
Other Regulatory Assets Pending Final Regulatory Approval	695		558
Total Regulatory Assets Pending Final Regulatory Approval	$	5,242	$	12,115

Indiana Michigan Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	8,592	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	32,128		—
Peak Demand Reduction/Energy Efficiency – Virginia	11,650		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Deferred Permit Fees Related to Retired Plants – West Virginia	617		—
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 – West Virginia	—		3,421
Expanded Net Energy Charge – Construction Surcharge – West Virginia	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	—		168
Total Regulatory Assets Pending Final Regulatory Approval	$	54,937	$	125,748

	I&M
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,652	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,955		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	3,445		1,222
Rockport Dry Sorbent Injection System	1,865		148
Storm Related Costs – Indiana	—		1,074
Other Regulatory Assets Pending Final Regulatory Approval	11		712
Total Regulatory Assets Pending Final Regulatory Approval	$	56,904	$	13,649

	OPCo
	September 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
Total Regulatory Assets Pending Final Regulatory Approval	$	10,483	$	10,483

	PSO
	September 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
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project	$	3,031	$	2,287
Asset Retirement Obligation	1,516		1,144
Rate Case Expenses	—		8,126
Other Regulatory Assets Pending Final Regulatory Approval	695		558
Total Regulatory Assets Pending Final Regulatory Approval	$	5,242	$	12,115

Ohio Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	8,592	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	32,128		—
Peak Demand Reduction/Energy Efficiency – Virginia	11,650		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Deferred Permit Fees Related to Retired Plants – West Virginia	617		—
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 – West Virginia	—		3,421
Expanded Net Energy Charge – Construction Surcharge – West Virginia	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	—		168
Total Regulatory Assets Pending Final Regulatory Approval	$	54,937	$	125,748

	I&M
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,652	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,955		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	3,445		1,222
Rockport Dry Sorbent Injection System	1,865		148
Storm Related Costs – Indiana	—		1,074
Other Regulatory Assets Pending Final Regulatory Approval	11		712
Total Regulatory Assets Pending Final Regulatory Approval	$	56,904	$	13,649

	OPCo
	September 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
Total Regulatory Assets Pending Final Regulatory Approval	$	10,483	$	10,483

	PSO
	September 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
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project	$	3,031	$	2,287
Asset Retirement Obligation	1,516		1,144
Rate Case Expenses	—		8,126
Other Regulatory Assets Pending Final Regulatory Approval	695		558
Total Regulatory Assets Pending Final Regulatory Approval	$	5,242	$	12,115

Public Service Co Of Oklahoma [Member]

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	8,592	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	32,128		—
Peak Demand Reduction/Energy Efficiency – Virginia	11,650		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Deferred Permit Fees Related to Retired Plants – West Virginia	617		—
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 – West Virginia	—		3,421
Expanded Net Energy Charge – Construction Surcharge – West Virginia	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	—		168
Total Regulatory Assets Pending Final Regulatory Approval	$	54,937	$	125,748

	I&M
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,652	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,955		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	3,445		1,222
Rockport Dry Sorbent Injection System	1,865		148
Storm Related Costs – Indiana	—		1,074
Other Regulatory Assets Pending Final Regulatory Approval	11		712
Total Regulatory Assets Pending Final Regulatory Approval	$	56,904	$	13,649

	OPCo
	September 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
Total Regulatory Assets Pending Final Regulatory Approval	$	10,483	$	10,483

	PSO
	September 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
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project	$	3,031	$	2,287
Asset Retirement Obligation	1,516		1,144
Rate Case Expenses	—		8,126
Other Regulatory Assets Pending Final Regulatory Approval	695		558
Total Regulatory Assets Pending Final Regulatory Approval	$	5,242	$	12,115

Southwestern Electric Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	8,592	$	—
Vegetation Management Program – West Virginia	—		19,089
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	32,128		—
Peak Demand Reduction/Energy Efficiency – Virginia	11,650		8,791
Amos Plant Transfer Costs – West Virginia	1,950		1,377
Deferred Permit Fees Related to Retired Plants – West Virginia	617		—
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 – West Virginia	—		3,421
Expanded Net Energy Charge – Construction Surcharge – West Virginia	—		2,307
Carbon Capture and Storage Commercial Scale Facility – West Virginia, FERC	—		1,287
Other Regulatory Assets Pending Final Regulatory Approval	—		168
Total Regulatory Assets Pending Final Regulatory Approval	$	54,937	$	125,748

	I&M
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Earning a Return
Materials and Supplies Related to Retired Plants	$	11,652	$	—
Regulatory Assets Currently Not Earning a Return
Asset Retirement Obligation Costs Related to Retired Plants	27,079		—
Cook Plant Turbine	8,955		6,596
Stranded Costs on Abandoned Plants	3,897		3,897
Deferred Cook Plant Life Cycle Management Project Costs – Michigan	3,445		1,222
Rockport Dry Sorbent Injection System	1,865		148
Storm Related Costs – Indiana	—		1,074
Other Regulatory Assets Pending Final Regulatory Approval	11		712
Total Regulatory Assets Pending Final Regulatory Approval	$	56,904	$	13,649

	OPCo
	September 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
Total Regulatory Assets Pending Final Regulatory Approval	$	10,483	$	10,483

	PSO
	September 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
	September 30,		December 31,
	2015		2014
Noncurrent Regulatory Assets	(in thousands)
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project	$	3,031	$	2,287
Asset Retirement Obligation	1,516		1,144
Rate Case Expenses	—		8,126
Other Regulatory Assets Pending Final Regulatory Approval	695		558
Total Regulatory Assets Pending Final Regulatory Approval	$	5,242	$	12,115