Rate Matters (Tables)

6 Months Ended

Jun. 30, 2017

Regulatory Assets Pending Final Regulatory Approval

	AEP
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant (a)	$	204.3	$	159.9
Storm-Related Costs	24.4		25.1
Plant Retirement Costs - Materials and Supplies	9.1		9.1
Ohio Capacity Deferral	—		96.7
Other Regulatory Assets Pending Final Regulatory Approval	1.1		1.3
Regulatory Assets Currently Not Earning a Return
Storm-Related Costs	41.2		25.9
Plant Retirement Costs - Asset Retirement Obligation Costs	37.2		29.6
Cook Plant Uprate Project	36.3		36.3
Environmental Control Projects	20.4		24.1
Cook Plant Turbine	14.3		12.8
Deferred Cook Plant Life Cycle Management Project Costs - Michigan	11.5		8.1
Other Regulatory Assets Pending Final Regulatory Approval	21.2		21.2
Total Regulatory Assets Pending Final Regulatory Approval (b)	$	421.0	$	450.1

Appalachian Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	APCo
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Materials and Supplies	$	9.1	$	9.1
Regulatory Assets Currently Not Earning a Return
Plant Retirement Costs - Asset Retirement Obligation Costs	37.2		29.6
Other Regulatory Assets Pending Final Regulatory Approval	0.6		0.6
Total Regulatory Assets Pending Final Regulatory Approval (a)	$	46.9	$	39.3

Indiana Michigan Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	I&M
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Not Earning a Return
Cook Plant Uprate Project	$	36.3	$	36.3
Cook Plant Turbine	14.3		12.8
Deferred Cook Plant Life Cycle Management Project Costs - Michigan	11.5		8.1
Rockport Dry Sorbent Injection System - Indiana	8.3		6.6
Other Regulatory Assets Pending Final Regulatory Approval	1.0		0.9
Total Regulatory Assets Pending Final Regulatory Approval	$	71.4	$	64.7

Ohio Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	OPCo
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Capacity Deferral	$	—	$	96.7
Regulatory Assets Currently Not Earning a Return
Smart Grid Costs	—		4.1
Total Regulatory Assets Pending Final Regulatory Approval	$	—	$	100.8

Public Service Co Of Oklahoma [Member]

Regulatory Assets Pending Final Regulatory Approval

	PSO
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant (a)	$	128.9	$	84.5
Other Regulatory Assets Pending Final Regulatory Approval	0.5		0.5
Regulatory Assets Currently Not Earning a Return
Storm-Related Costs	35.4		20.0
Environmental Control Projects	20.4		13.1
Other Regulatory Assets Pending Final Regulatory Approval	0.2		—
Total Regulatory Assets Pending Final Regulatory Approval	$	185.4	$	118.1

Southwestern Electric Power Co [Member]

Regulatory Assets Pending Final Regulatory Approval

	SWEPCo
	June 30,		December 31,
	2017		2016
Noncurrent Regulatory Assets	(in millions)
Regulatory Assets Currently Earning a Return
Plant Retirement Costs - Unrecovered Plant	$	75.4	$	75.4
Other Regulatory Assets Pending Final Regulatory Approval	0.5		0.8
Regulatory Assets Currently Not Earning a Return
Shipe Road Transmission Project - FERC	3.3		3.1
Asset Retirement Obligation - Arkansas, Louisiana	3.3		2.7
Rate Case Expense - Texas	2.1		1.0
Environmental Control Projects	—		11.0
Other Regulatory Assets Pending Final Regulatory Approval	2.1		1.9
Total Regulatory Assets Pending Final Regulatory Approval	$	86.7	$	95.9