Rate Matters (Tables)

9 Months Ended

Sep. 30, 2016

Regulatory Assets Pending Final Regulatory Approval

	AEP
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant	$	161.3	$	—
Storm-Related Costs	25.4		24.2
Plant Retirement Costs - Materials and Supplies	20.8		20.9
Other Regulatory Assets Pending Final Regulatory Approval	1.2		—
Regulatory Assets Currently Not Earning a Return
Plant Retirement Costs - Asset Retirement Obligation Costs	56.7		59.8
Storm-Related Costs	26.7		18.2
Cook Plant Turbine	12.0		9.7
Peak Demand Reduction/Energy Efficiency	0.2		13.1
Other Regulatory Assets Pending Final Regulatory Approval	39.0		22.0
Total Regulatory Assets Pending Final Regulatory Approval	$	343.3	$	167.9

Appalachian Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	APCo
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Materials and Supplies	$	9.2	$	9.3
Regulatory Assets Currently Not Earning a Return
Plant Retirement Costs - Asset Retirement Obligation Costs	29.6		32.7
Peak Demand Reduction/Energy Efficiency - Virginia	—		12.7
Amos Plant Transfer Costs - West Virginia	—		2.0
Other Regulatory Assets Pending Final Regulatory Approval	0.6		0.6
Total Regulatory Assets Pending Final Regulatory Approval	$	39.4	$	57.3

Indiana Michigan Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	I&M
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Materials and Supplies	$	11.6	$	11.6
Regulatory Assets Currently Not Earning a Return
Plant Retirement Costs - Asset Retirement Obligation Costs - Indiana	27.1		27.1
Cook Plant Turbine	12.0		9.7
Deferred Cook Plant Life Cycle Management Project Costs - Michigan	7.1		4.2
Rockport Dry Sorbent Injection System - Indiana	5.5		2.8
Stranded Costs on Retired Plant	3.9		3.9
Other Regulatory Assets Pending Final Regulatory Approval	0.6		—
Total Regulatory Assets Pending Final Regulatory Approval	$	67.8	$	59.3

Ohio Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	OPCo
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Not Earning a Return
OVEC Purchased Power	9.1		—
gridSMART® Costs	3.2		1.3
Total Regulatory Assets Pending Final Regulatory Approval	$	12.3	$	1.3

Public Service Co Of Oklahoma [Member]

Regulatory Assets Pending Final Regulatory Approval

	PSO
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant	$	85.9	$	—
Plant Retirement Costs - Asset Retirement Obligation Costs	0.5		—
Regulatory Assets Currently Not Earning a Return
Storm-Related Costs	20.5		12.3
Other Regulatory Assets Pending Final Regulatory Approval	1.3		1.1
Total Regulatory Assets Pending Final Regulatory Approval	$	108.2	$	13.4

Southwestern Electric Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	SWEPCo
	September 30,		December 31,
	2016		2015
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant	$	75.4	$	—
Plant Retirement Costs - Asset Retirement Obligation Costs	0.5		—
Other Regulatory Assets Pending Final Regulatory Approval	0.1		—
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project - FERC	3.1		3.1
Asset Retirement Obligation - Arkansas, Louisiana	2.5		1.7
Other Regulatory Assets Pending Final Regulatory Approval	2.2		1.1
Total Regulatory Assets Pending Final Regulatory Approval	$	83.8	$	5.9