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Derivative Accounting (Tables)
 9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Outstanding gross notional amount of derivatives, which represents both purchases and sales (does not reflect net position)
The following table shows the outstanding gross notional volume of derivatives, which represent both purchases and sales (does not reflect net position): 
Quantity
CommodityUnit of MeasureSeptember 30, 2021December 31, 2020
PowerGWh— 368 
GasBillion cubic feet161 205 
Gains and losses from derivative instruments in designated cash flow accounting hedges relationships
The following table provides information about APS’s gains and losses from derivative instruments in designated cash flow accounting hedging relationships (dollars in thousands):
 
 Financial Statement LocationThree Months Ended
September 30,		Nine Months Ended
September 30,
Commodity Contracts2021202020212020
Loss Reclassified from Accumulated OCI into Income (Effective Portion Realized) (a)Fuel and purchased power (b)$— $— $— $(763)

(a)During the three and nine months ended September 30, 2021 and 2020, we had no gains or 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 (dollars in thousands):

 Financial Statement LocationThree Months Ended
September 30,		Nine Months Ended
September 30,
Commodity Contracts2021202020212020
Net Gain Recognized in IncomeFuel and purchased power (a)$147,712 $49,611 $269,686 $14,639 
 
(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.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities and other assets lines of our Condensed Consolidated Balance Sheets.

As of September 30, 2021:
 (dollars in thousands)
Gross
 Recognized
 Derivatives
 (a)
Amounts
Offset
 (b)
Net
 Recognized
 Derivatives
Other
 (c)
Amount Reported on Balance Sheets
Current assets$129,202 $(2,683)$126,519 $76 $126,595 
Investments and other assets68,682 — 68,682 — 68,682 
Total assets197,884 (2,683)195,201 76 195,277 
Current liabilities(2,700)2,683 (17)(1,635)(1,652)
Deferred credits and other— — — — — 
Total liabilities(2,700)2,683 (17)(1,635)(1,652)
Total$195,184 $— $195,184 $(1,559)$193,625 

(a)All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c)Represents cash collateral that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions or collateral posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $1,635 and cash margin provided to counterparties of $76.

As of December 31, 2020:
 (dollars in thousands)
Gross
Recognized
Derivatives
 (a)
Amounts
Offset
(b)
Net
 Recognized
 Derivatives
Other
 (c)
Amount
Reported on
Balance Sheets
Current assets$5,870 $(2,939)$2,931 $— $2,931 
Investments and other assets3,150 (1,332)1,818 — 1,818 
Total assets9,020 (4,271)4,749 — 4,749 
Current liabilities(9,211)2,939 (6,272)(1,285)(7,557)
Deferred credits and other(12,394)1,332 (11,062)— (11,062)
Total liabilities(21,605)4,271 (17,334)(1,285)(18,619)
Total$(12,585)$— $(12,585)$(1,285)$(13,870)

(a)All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c)Represents cash collateral and cash 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 $1,285.
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.  These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities and other assets lines of our Condensed Consolidated Balance Sheets.

As of September 30, 2021:
 (dollars in thousands)
Gross
 Recognized
 Derivatives
 (a)
Amounts
Offset
 (b)
Net
 Recognized
 Derivatives
Other
 (c)
Amount Reported on Balance Sheets
Current assets$129,202 $(2,683)$126,519 $76 $126,595 
Investments and other assets68,682 — 68,682 — 68,682 
Total assets197,884 (2,683)195,201 76 195,277 
Current liabilities(2,700)2,683 (17)(1,635)(1,652)
Deferred credits and other— — — — — 
Total liabilities(2,700)2,683 (17)(1,635)(1,652)
Total$195,184 $— $195,184 $(1,559)$193,625 

(a)All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c)Represents cash collateral that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions or collateral posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $1,635 and cash margin provided to counterparties of $76.

As of December 31, 2020:
 (dollars in thousands)
Gross
Recognized
Derivatives
 (a)
Amounts
Offset
(b)
Net
 Recognized
 Derivatives
Other
 (c)
Amount
Reported on
Balance Sheets
Current assets$5,870 $(2,939)$2,931 $— $2,931 
Investments and other assets3,150 (1,332)1,818 — 1,818 
Total assets9,020 (4,271)4,749 — 4,749 
Current liabilities(9,211)2,939 (6,272)(1,285)(7,557)
Deferred credits and other(12,394)1,332 (11,062)— (11,062)
Total liabilities(21,605)4,271 (17,334)(1,285)(18,619)
Total$(12,585)$— $(12,585)$(1,285)$(13,870)

(a)All of our gross recognized derivative instruments were subject to master netting arrangements.
(b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting.
(c)Represents cash collateral and cash 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 $1,285.
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 (dollars in thousands):
 September 30, 2021
Aggregate fair value of derivative instruments in a net liability position$2,700 
Cash collateral posted— 
Additional cash collateral in the event credit-risk-related contingent features were fully triggered—