XML 54 R31.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Regulatory Assets and Liabilities [Table Text Block]
The following table is a summary of OG&E's regulatory assets and liabilities at:
December 31 (In millions)
2012
2011
Regulatory Assets
 
 
Current
 
 
Crossroads wind farm rider under recovery (A)
$
14.9

$
2.5

Oklahoma demand program rider under recovery (A)
9.2

8.1

Fuel clause under recoveries
—

1.8

Other (A)
2.9

3.6

Total Current Regulatory Assets
$
27.0

$
16.0

Non-Current
 
 
Benefit obligations regulatory asset
$
370.6

$
359.2

Income taxes recoverable from customers, net
54.7

54.0

Smart Grid
42.8

37.2

Unamortized loss on reacquired debt
13.0

14.2

Deferred storm expenses
12.7

23.8

Deferred pension expenses
4.5

9.1

Other
12.3

10.4

Total Non-Current Regulatory Assets
$
510.6

$
507.9

Regulatory Liabilities
 
 
Current
 
 
Fuel clause over recoveries
$
109.2

$
7.7

Smart Grid rider over recovery (B)
24.1

24.3

Other (B)
7.8

13.7

Total Current Regulatory Liabilities
$
141.1

$
45.7

Non-Current
 
 
Accrued removal obligations, net
$
218.2

$
208.2

Deferred pension credits
17.7

—

Pension tracker
9.2

22.5

Total Non-Current Regulatory Liabilities
$
245.1

$
230.7

(A)
Included in Other Current Assets on the Consolidated Balance Sheets.
(B)
Included in Other Current Liabilities on the Consolidated Balance Sheets.
Components of Benefit Obligation Regulatory Asset [Table Text Block]
The following table is a summary of the components of the benefit obligations regulatory asset at:
December 31 (In millions)
2012
2011
Pension Plan and Restoration of Retirement Income Plan:
 
 
Net loss
$
278.6

$
266.3

Prior service cost
4.5

7.0

Postretirement plans:
 
 
Net loss
134.6

144.2

Prior service cost
(47.1
)
(60.8
)
Net transition obligation
—

2.5

Total
$
370.6

$
359.2
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2012 are expected to be recognized as components of net periodic benefit cost in 2013: 
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan:
 
Net loss
$
19.8

Prior service cost
2.0

Postretirement plans:
 
Net loss
18.1

Prior service cost
(13.7
)
Total
$
26.2
Schedule of Jointly Owned Utility Plants [Table Text Block]
The table below presents OG&E's ownership interest in the jointly-owned McClain Plant and the jointly-owned Redbud Plant, and, as disclosed below, only OG&E's ownership interest is reflected in the property, plant and equipment and accumulated depreciation balances in these tables.  The owners of the remaining interests in the McClain Plant and the Redbud Plant are responsible for providing their own financing of capital expenditures.  Also, only OG&E's proportionate interests of any direct expenses of the McClain Plant and the Redbud Plant such as fuel, maintenance expense and other operating expenses are included in the applicable financial statement captions in the Consolidated Statement of Income.
December 31, 2012 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant
77
%
$
182.1

$
56.3

$
125.8

Redbud Plant (A)
51
%
$
458.5

$
69.5

$
389.0


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $23.3 million.
Property, Plant and Equipment [Table Text Block]
The Company's property, plant and equipment and related accumulated depreciation are divided into the following major classes at: 
December 31, 2012 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
142.1

$
103.2

$
38.9

OGE Energy property, plant and equipment
142.1

103.2

38.9

OG&E
 
 
 
Distribution assets
3,222.7

969.6

2,253.1

Electric generation assets (A)
3,446.6

1,242.4

2,204.2

Transmission assets (B)
1,712.6

359.8

1,352.8

Intangible plant
50.2

25.0

25.2

Other property and equipment
317.6

108.8

208.8

OG&E property, plant and equipment
8,749.7

2,705.6

6,044.1

Enogex
 
 
 
Natural gas transportation and storage assets
988.6

292.7

695.9

Natural gas gathering and processing assets
2,011.5

445.6

1,565.9

Enogex property, plant and equipment
3,000.1

738.3

2,261.8

Total property, plant and equipment
$
11,891.9

$
3,547.1

$
8,344.8

(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $23.3 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.3 million.
December 31, 2011 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
124.6

$
90.6

$
34.0

OGE Energy property, plant and equipment
124.6

90.6

34.0

OG&E
 
 
 
Distribution assets
2,981.3

920.3

2,061.0

Electric generation assets (A)
3,360.6

1,215.8

2,144.8

Transmission assets (B)
1,464.2

339.6

1,124.6

Intangible plant
43.2

20.3

22.9

Other property and equipment
293.9

96.3

197.6

OG&E property, plant and equipment
8,143.2

2,592.3

5,550.9

Enogex
 
 
 
Natural gas transportation and storage assets
967.0

277.0

690.0

Natural gas gathering and processing assets
1,580.1

381.0

1,199.1

Enogex property, plant and equipment
2,547.1

658.0

1,889.1

Total property, plant and equipment
$
10,814.9

$
3,340.9

$
7,474.0


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $17.9 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.2 million.
Schedule of Unamortized Computer Software Costs [Table Text Block]
The following table summarizes the Company's unamortized computer software costs.
December 31 (In millions)
2012
2011
OGE Energy (holding company)
$
11.6

$
14.0

OG&E
17.6

6.7

Enogex
3.9

4.4

Total
$
33.1

$
25.1
Schedule of Computer Software Costs, Amortization [Table Text Block]
The following table summarized the Company's amortization expense for computer software costs.
Year ended December 31 (In millions)
2012
2011
2010
OGE Energy (holding company)
$
6.8

$
6.4

$
5.3

OG&E
4.2

1.8

2.6

Enogex
3.1

1.0

2.2

Total
$
14.1

$
9.2

$
10.1
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The following table below summarizes Enogex's intangible assets and related accumulated amortization at:
(In millions)
Total Intangible Assets
Accumulated Amortization
Net Intangible Assets
December 31, 2012
 
 
 
Customer Contract / Acreage Dedication
$
141.9

$
14.5

$
127.4

 
 
 
 
December 31, 2011
 
 
 
Customer Contract / Acreage Dedication
$
141.9

$
4.9

$
137.0
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table summarizes Enogex's expected amortization of intangible assets for each of the next five years.
(In millions)
2013
2014
2015
2016
2017
Expected amortization of intangible assets
$
9.5

$
9.5

$
9.5

$
9.5

$
9.1
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following table summarizes changes to the Company's asset retirement obligations during the years ended December 31, 2012 and 2011.
(In millions)
2012
2011
Balance at January 1
$
24.8

$
11.1

Liabilities incurred (A)
0.4

13.0

Accretion expense
1.9

0.7

Revisions in estimated cash flows (B)
26.9

—

Balance at December 31
$
54.0

$
24.8

(A)
Due to certain Enogex compression assets in 2012 and OG&E's Crossroads wind farm in 2011.
(B)
Due to changes to OG&E's asset retirement obligations related to its wind farms due to a change in the assumption related to the timing of removal used in the valuation of the asset retirement obligations.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the components of accumulated other comprehensive loss at December 31, 2012 and 2011 attributable to OGE Energy.  At both December 31, 2012 and 2011, there was no accumulated other comprehensive loss related to Enogex's noncontrolling interest in Atoka.
December 31 (In millions)
2012
2011
Pension Plan and Restoration of Retirement Income Plan:
 
 
Net loss
$
(49.3
)
$
(42.1
)
Prior service cost
0.1

(0.1
)
Postretirement plans:
 
 
Net loss
(15.7
)
(15.4
)
Prior service cost
7.2

9.0

Net transition obligation
—

(0.1
)
Deferred commodity contracts hedging gains
0.1

3.3

Deferred interest rate swap hedging losses
(0.5
)
(0.7
)
Total accumulated other comprehensive loss
(58.1
)
(46.1
)
Less:  Accumulated other comprehensive loss attributable to noncontrolling interests
(9.0
)
(5.5
)
Accumulated other comprehensive loss, net of tax
$
(49.1
)
$
(40.6
)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The amounts in accumulated other comprehensive loss at December 31, 2012 that are expected to be recognized into earnings in 2013 are as follows:
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan:
 
Net loss
$
3.3

Prior service cost
0.1

Postretirement plans:
 
Net loss
2.0

Prior service cost
(1.8
)
Deferred commodity contracts hedging gains
0.1

Deferred interest rate swap hedging losses
(0.2
)
Total, net of tax
$
3.5