XML 1051 R29.htm IDEA: XBRL DOCUMENT v3.3.1.900
Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
2014
Regulatory Assets
 
 
Current
 
 
Oklahoma demand program rider under recovery (A)
$
36.6

$
19.7

Fuel clause under recoveries
—

68.3

Other (A)(B)
9.9

10.2

Total Current Regulatory Assets
$
46.5

$
98.2

Non-Current
 
 
Benefit obligations regulatory asset
$
242.2

$
261.1

Income taxes recoverable from customers, net
56.7

56.1

Smart Grid
43.6

43.9

Deferred storm expenses
27.6

17.5

Unamortized loss on reacquired debt
14.8

16.1

Other (B)
17.3

15.7

Total Non-Current Regulatory Assets
$
402.2

$
410.4

Regulatory Liabilities
 
 
Current
 
 
Fuel clause over recoveries
$
61.3

$
—

Crossroads wind farm rider over recovery (C)
2.9

10.3

Smart Grid rider over recovery (C)
2.0

12.5

Other (C)
2.6

1.6

Total Current Regulatory Liabilities
$
68.8

$
24.4

Non-Current
 
 
Accrued removal obligations, net
$
254.9

$
248.1

Pension tracker
17.7

14.9

Total Non-Current Regulatory Liabilities
$
272.6

$
263.0

(A)
Included in Other Current Assets on the Consolidated Balance Sheets.
(B)
Prior year amount of $1.1 million reclassified from Non-Current Other assets to Current Other assets.
(C)
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)
2015
2014
Pension Plan and Restoration of Retirement Income Plan
 
 
Net loss
$
214.1

$
196.7

Prior service cost
—

0.6

Postretirement Benefit Plans
 
 
Net loss
34.2

83.6

Prior service cost
(6.1
)
(19.8
)
Total
$
242.2

$
261.1
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
The following amounts in the benefit obligations regulatory asset at December 31, 2015 are expected to be recognized as components of net periodic benefit cost in 2016: 
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
13.1

Prior service cost
—

Postretirement Benefit Plans
 
Net loss
2.0

Prior service cost
6.1

Total
$
21.2
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 Statements of Income.
December 31, 2015 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
220.4

$
62.8

$
157.6

Redbud Plant (A)(B)
51
%
$
487.5

$
101.2

$
386.3


(A)
Construction work in progress was $1.6 million and $1.3 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $39.8 million.

December 31, 2014 (In millions)
Percentage Ownership
Total Property, Plant and Equipment
Accumulated Depreciation
Net Property, Plant and Equipment
McClain Plant (A)
77
%
$
207.7

$
46.6

$
161.1

Redbud Plant (A)(B)
51
%
$
484.1

$
81.8

$
402.3


(A)
Construction work in progress was $0.5 million and $0.4 million for the McClain and Redbud Plants, respectively.
(B)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 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, 2015 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
139.0

$
112.7

$
26.3

OGE Energy property, plant and equipment
139.0

112.7

26.3

OG&E
 
 
 
Distribution assets
3,728.8

1,152.8

2,576.0

Electric generation assets (A)
3,837.4

1,407.0

2,430.4

Transmission assets (B)
2,454.2

440.7

2,013.5

Intangible plant
81.0

38.0

43.0

Other property and equipment
356.4

123.2

233.2

OG&E property, plant and equipment
10,457.8

3,161.7

7,296.1

Total property, plant and equipment
$
10,596.8

$
3,274.4

$
7,322.4

(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $39.8 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.5 million.
December 31, 2014 (In millions)
Total Property, Plant and Equipment    
Accumulated Depreciation
Net Property, Plant and Equipment
OGE Energy (holding company)
 
 
 
Property, plant and equipment
$
151.7

$
113.3

$
38.4

OGE Energy property, plant and equipment
151.7

113.3

38.4

OG&E
 
 
 
Distribution assets
3,559.5

1,086.7

2,472.8

Electric generation assets (A)
3,620.1

1,345.1

2,275.0

Transmission assets (B)
2,370.0

417.8

1,952.2

Intangible plant
67.6

31.1

36.5

Other property and equipment
330.0

125.0

205.0

OG&E property, plant and equipment
9,947.2

3,005.7

6,941.5

Total property, plant and equipment
$
10,098.9

$
3,119.0

$
6,979.9


(A)
This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $34.3 million.
(B)
This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.4 million.
Schedule of Unamortized Computer Software Costs [Table Text Block]
The following table summarizes the Company's unamortized computer software costs.
Year ended December 31 (In millions)
2015
2014
OGE Energy (holding company)
$
2.4

$
4.5

OG&E
34.3

33.6

Total
$
36.7

$
38.1
Schedule of Computer Software Costs, Amortization [Table Text Block]
The following table summarizes the Company's amortization expense for computer software costs.
Year ended December 31 (In millions)
2015
2014
2013
OGE Energy (holding company)
$
2.0

$
4.3

$
6.4

OG&E
6.9

5.2

4.0

Enogex LLC
—

—

0.8

Total
$
8.9

$
9.5

$
11.2
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, 2015 and 2014.
(In millions)
2015
2014
Balance at January 1
$
58.6

$
55.2

Accretion expense
2.6

2.5

Revisions in estimated cash flows (A)
1.6

1.7

Additions (B)
0.9

—

Liabilities settled (C)
(0.4
)
(0.8
)
Balance at December 31
$
63.3

$
58.6


(A)
Assumptions changed related to the estimated cost of removal for one of OG&E's generating facilities.
(B)
OG&E recorded an asset retirement obligation for $0.9 million for the ash pond located at the Muskogee generating facility.
(C)
In 2015, asset retirement obligations were settled for the asbestos abatement at one of OG&E's generating facilities.

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables summarize changes in the components of accumulated other comprehensive loss attributable to OGE Energy during 2014 and 2015. All amounts below are presented net of tax.
 
Pension Plan and Restoration of Retirement Income Plan
 
Postretirement Benefit Plans
 
(In millions)
Net loss
Prior service cost
Settlement cost
 
Net loss
Prior service cost
Total
Balance at December 31, 2013
$
(27.4
)
$
0.1

$
—

 
$
(5.8
)
$
5.1

$
(28.0
)
Other comprehensive income (loss) before reclassifications
(11.1
)
—

—

 
(3.1
)
—

(14.2
)
Amounts reclassified from accumulated other comprehensive income (loss)
1.7

—

—

 
0.9

(1.8
)
0.8

Net current period other comprehensive income (loss)
(9.4
)
—

—

 
(2.2
)
(1.8
)
(13.4
)
Balance at December 31, 2014
$
(36.8
)
$
0.1

$
—

 
$
(8.0
)
$
3.3

$
(41.4
)
Other comprehensive income (loss) before reclassifications
(9.5
)
—

—

 
9.3

—

(0.2
)
Amounts reclassified from accumulated other comprehensive income (loss)
2.5

—

4.6

 
1.2

(1.8
)
6.5

Net current period other comprehensive income (loss)
(7.0
)
—

4.6

 
10.5

(1.8
)
6.3

Balance at December 31, 2015
$
(43.8
)
$
0.1

$
4.6

 
$
2.5

$
1.5

$
(35.1
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table summarizes significant amounts reclassified out of accumulated other comprehensive loss by the respective line items in net income during the years ended December 31, 2015 and 2014.
Details about Accumulated Other Comprehensive Income (Loss) Components
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)
Affected Line Item in the Statement Where Net Income is Presented
 
Year Ended December 31,
 
(In millions)
2015
2014
 
Losses on cash flow hedges
 
 
 
Interest rate swap
$
—

$
(0.3
)
Interest expense
 
—

(0.3
)
Total before tax
 
—

(0.1
)
Tax benefit
 
$
—

$
(0.2
)
Net of tax
 
 
 
 
Amortization of defined benefit pension and restoration of retirement income plan items
 
 
 
Actuarial losses
$
(4.7
)
$
(3.0
)
(A)
(Settlement) curtailment cost
(7.5
)
0.2

(A)
 
(12.2
)
(2.8
)
Total before tax
 
(5.1
)
(1.1
)
Tax benefit
 
$
(7.1
)
$
(1.7
)
Net of tax
 
 
 
 
Amortization of postretirement benefit plan items
 
 
 
Actuarial losses
$
(2.0
)
$
(1.4
)
(A)
Prior service cost
2.9

2.9

(A)
 
0.9

1.5

Total before tax
 
0.3

0.6

Tax expense
 
$
0.6

$
0.9

Net of tax
 
 
 
 
Total reclassifications for the period
$
(6.5
)
$
(1.0
)
Net of tax
(A)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 12 for additional information).
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, 2015 that are expected to be recognized into earnings in 2016 are as follows:
(In millions)
 
Pension Plan and Restoration of Retirement Income Plan
 
Net loss
$
(4.8
)
Postretirement Benefit Plans
 
Net loss
—

Prior service cost
(2.6
)
Total, net of tax
$
(7.4
)