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Derivative Accounting (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Outstanding gross notional amount of derivatives, which represents both purchases and sales (does not reflect net position)
As of December 31, 2014, we had the following outstanding gross notional volume of derivatives, which represent both purchases and sales (does not reflect net position):
 
Commodity
 
Quantity
Power
 
3,915

 
GWh
Gas
 
136

 
Bcf (a)
(a)
“Bcf” is Billion Cubic Feet.
Gains and losses from derivative instruments in designated cash flow accounting hedges relationships
The following table provides information about gains and losses from derivative instruments in designated cash flow accounting hedging relationships during the years ended December 31, 2014, 2013 and 2012 (dollars in thousands):
 
 
 
Financial Statement 
 
Year Ended
December 31,
Commodity Contracts
 
Location
 
2014
 
2013
 
2012
Loss Recognized in OCI on Derivative Instruments (Effective Portion)
 
OCI — derivative instruments
 
$
(372
)
 
$
(353
)
 
$
(37,663
)
Loss Reclassified from Accumulated OCI into Income (Effective Portion Realized) (a)
 
Fuel and purchased power (b)
 
(21,415
)
 
(44,219
)
 
(99,007
)
Gain Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
 
Fuel and purchased power (b)
 
—

 
—

 
117


(a)
During the years ended December 31, 2014, 2013, and 2012, we had zero, zero, and $1.8 million of losses reclassified from accumulated OCI to earnings related to discontinued cash flow hedges.
(b)
Amounts are before the effect of PSA deferrals.
Gains and losses from derivative instruments not designated as accounting hedges instruments
The following table provides information about gains and losses from derivative instruments not designated as accounting hedging instruments during the years ended December 31, 2014, 2013 and 2012 (dollars in thousands):
 
 
 
Financial Statement 
 
Year Ended
December 31,
Commodity Contracts
 
Location
 
2014
 
2013
 
2012
Net Gain Recognized in Income
 
Operating revenues
 
$
324

 
$
289

 
$
103

Net Loss Recognized in Income
 
Fuel and purchased power (a)
 
(66,367
)
 
(10,449
)
 
(2,747
)
Total
 
 
 
$
(66,043
)
 
$
(10,160
)
 
$
(2,644
)

(a)
Amounts are before the effect of PSA deferrals.
Schedule of the entity's fair value of risk management activities reported on a gross basis and the impacts of offsetting
The following tables provide information about the fair value of our risk management activities reported on a gross basis, and the impacts of offsetting as of December 31, 2014 and 2013.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Consolidated Balance Sheets.
 
As of December 31, 2014:
(dollars in thousands)
 
Gross 
Recognized 
Derivatives
 (a)
 
Amounts 
Offset
(b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount 
Reported on 
Balance Sheet
Current Assets
 
$
28,562

 
$
(15,127
)
 
$
13,435

 
$
350

 
$
13,785

Investments and Other Assets
 
24,810

 
(7,190
)
 
17,620

 
—

 
17,620

Total Assets
 
53,372

 
(22,317
)
 
31,055

 
350

 
31,405

 
 
 
 
 
 
 
 
 
 
 
Current Liabilities
 
(86,062
)
 
33,829

 
(52,233
)
 
(7,443
)
 
(59,676
)
Deferred Credits and Other
 
(82,990
)
 
32,388

 
(50,602
)
 
—

 
(50,602
)
Total Liabilities
 
(169,052
)
 
66,217

 
(102,835
)
 
(7,443
)
 
(110,278
)
Total
 
$
(115,680
)
 
$
43,900

 
$
(71,780
)
 
$
(7,093
)
 
$
(78,873
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $43,900.
(c)
Represents cash collateral and margin that is not subject to offsetting.  Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument.  Includes cash collateral received from counterparties of $7,443, and cash margin provided to counterparties of $350.
 
As of December 31, 2013:
(dollars in thousands)
 
Gross
 Recognized
 Derivatives
 (a)
 
Amounts
Offset 
(b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount
 Reported on
 Balance Sheet
Current Assets
 
$
24,587

 
$
(7,425
)
 
$
17,162

 
$
7

 
$
17,169

Investments and Other Assets
 
25,364

 
(1,549
)
 
23,815

 
—

 
23,815

Total Assets
 
49,951

 
(8,974
)
 
40,977

 
7

 
40,984

 
 
 
 
 
 
 
 
 
 
 
Current Liabilities
 
(50,540
)
 
26,166

 
(24,374
)
 
(7,518
)
 
(31,892
)
Deferred Credits and Other
 
(72,123
)
 
1,808

 
(70,315
)
 
—

 
(70,315
)
Total Liabilities
 
(122,663
)
 
27,974

 
(94,689
)
 
(7,518
)
 
(102,207
)
Total
 
$
(72,712
)
 
$
19,000

 
$
(53,712
)
 
$
(7,511
)
 
$
(61,223
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $19,000.
(c)
Represents cash collateral and margin that is not subject to offsetting.  Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument.  Includes cash collateral received from counterparties of $7,518, and cash margin provided to counterparties of $7. 
Information about derivative instruments that have credit-risk-related contingent features
The following table provides information about our derivative instruments that have credit-risk-related contingent features at December 31, 2014 (dollars in millions):
 
 
December 31, 2014
Aggregate Fair Value of Derivative Instruments in a Net Liability Position
$
169

Cash Collateral Posted
44

Additional Cash Collateral in the Event Credit-Risk Related Contingent Features were Fully Triggered (a)
80


(a)
This amount is after counterparty netting and includes those contracts which qualify for scope exceptions, which are excluded from the derivative details above.