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Derivative Accounting (Tables)
 9 Months Ended
Sep. 30, 2015
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 September 30, 2015, we had the following outstanding gross notional volume of derivatives, which represent both purchases and sales (does not reflect net position): 
Commodity
 
Quantity
Power
 
2,926

 
GWh
Gas
 
178

 
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 three and nine months ended September 30, 2015 and 2014 (dollars in thousands):
 
 
 
Financial Statement Location
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
Commodity Contracts
 
 
2015
 
2014
 
2015
 
2014
Gain (loss) recognized in OCI on derivative instruments (effective portion)
 
OCI — derivative instruments
 
$
(247
)
 
$
(149
)
 
$
(534
)
 
$
94

Loss reclassified from accumulated OCI into income (effective portion realized) (a)
 
Fuel and purchased power (b)
 
(1,459
)
 
(9,772
)
 
(5,232
)
 
(17,426
)

(a)
During the three and nine months ended September 30, 2015 and 2014, we had no amounts 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 three and nine months ended September 30, 2015 and 2014 (dollars in thousands):
 
 
 
Financial Statement Location
 
Three Months Ended 
 September 30,
 
Nine Months Ended September 30,
Commodity Contracts
 
 
2015
 
2014
 
2015
 
2014
Net gain recognized in income
 
Operating revenues (a)
 
$
560

 
$
273

 
$
445

 
$
335

Net loss recognized in income
 
Fuel and purchased power (a)
 
(50,909
)
 
(23,915
)
 
(85,099
)
 
(1,003
)
Total
 
 
 
$
(50,349
)
 
$
(23,642
)
 
$
(84,654
)
 
$
(668
)

(a)
Amounts are before the effect of PSA deferrals.
Schedule of offsetting assets
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 September 30, 2015 and December 31, 2014.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Condensed Consolidated Balance Sheets.
As of September 30, 2015:
(Dollars in thousands)
 
Gross
 Recognized
 Derivatives
 (a)
 
Amounts
Offset
 (b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount Reported on Balance  Sheet
Current assets
 
$
32,129

 
$
(18,885
)
 
$
13,244

 
$
410

 
$
13,654

Investments and other assets
 
18,418

 
(4,340
)
 
14,078

 
1,230

 
15,308

Total assets
 
50,547

 
(23,225
)
 
27,322

 
1,640

 
28,962

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(99,301
)
 
32,785

 
(66,516
)
 
(8,121
)
 
(74,637
)
Deferred credits and other
 
(100,700
)
 
4,340

 
(96,360
)
 
—

 
(96,360
)
Total liabilities
 
(200,001
)
 
37,125

 
(162,876
)
 
(8,121
)
 
(170,997
)
Total
 
$
(149,454
)
 
$
13,900

 
$
(135,554
)
 
$
(6,481
)
 
$
(142,035
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $13,900.
(c)
Represents cash collateral, cash margin and option premiums that are 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 $8,121, cash margin provided to counterparties of $410 and option premiums of $1,230.
 
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.
Schedule of offsetting liabilities
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 September 30, 2015 and December 31, 2014.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of our Condensed Consolidated Balance Sheets.
As of September 30, 2015:
(Dollars in thousands)
 
Gross
 Recognized
 Derivatives
 (a)
 
Amounts
Offset
 (b)
 
Net
 Recognized
 Derivatives
 
Other
 (c)
 
Amount Reported on Balance  Sheet
Current assets
 
$
32,129

 
$
(18,885
)
 
$
13,244

 
$
410

 
$
13,654

Investments and other assets
 
18,418

 
(4,340
)
 
14,078

 
1,230

 
15,308

Total assets
 
50,547

 
(23,225
)
 
27,322

 
1,640

 
28,962

 
 
 
 
 
 
 
 
 
 
 
Current liabilities
 
(99,301
)
 
32,785

 
(66,516
)
 
(8,121
)
 
(74,637
)
Deferred credits and other
 
(100,700
)
 
4,340

 
(96,360
)
 
—

 
(96,360
)
Total liabilities
 
(200,001
)
 
37,125

 
(162,876
)
 
(8,121
)
 
(170,997
)
Total
 
$
(149,454
)
 
$
13,900

 
$
(135,554
)
 
$
(6,481
)
 
$
(142,035
)

(a)
All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)
Includes cash collateral provided to counterparties of $13,900.
(c)
Represents cash collateral, cash margin and option premiums that are 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 $8,121, cash margin provided to counterparties of $410 and option premiums of $1,230.
 
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.
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 September 30, 2015 (dollars in millions):
 
September 30, 2015
Aggregate fair value of derivative instruments in a net liability position
$
200

Cash collateral posted
14

Additional cash collateral in the event credit-risk-related contingent features were fully triggered (a)
112


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