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FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Financial instruments measured at fair value on a recurring basis
The following tables present, by level within the fair value hierarchy, TEP’s assets and liabilities accounted for at fair value through net income on a recurring basis classified in their entirety based on the lowest level of input that is significant to the fair value measurement:
 
Level 1
 
Level 2
 
Level 3
 
Total
(in millions)
December 31, 2019
Assets
 
Restricted Cash (1)
$
18

 
$

 
$

 
$
18

Energy Derivative Contracts, Regulatory Recovery (2)

 
3

 

 
3

Energy Derivative Contracts, No Regulatory Recovery (2)

 
3

 

 
3

Total Assets
18

 
6

 

 
24

Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts, Regulatory Recovery (2)

 
(76
)
 

 
(76
)
Total Liabilities

 
(76
)
 

 
(76
)
Total Assets (Liabilities), Net
$
18

 
$
(70
)
 
$

 
$
(52
)
(in millions)
December 31, 2018
Assets
 
Cash Equivalents (1)
$
55

 
$

 
$

 
$
55

Restricted Cash (1)
15

 

 

 
15

Energy Derivative Contracts, Regulatory Recovery (2)

 
10

 

 
10

Energy Derivative Contracts, No Regulatory Recovery (2)

 

 
2

 
2

Total Assets
70

 
10

 
2

 
82

Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts, Regulatory Recovery (2)

 
(35
)
 
(2
)
 
(37
)
Total Liabilities

 
(35
)
 
(2
)
 
(37
)
Total Assets (Liabilities), Net
$
70

 
$
(25
)
 
$

 
$
45

(1) 
Cash Equivalents and Restricted Cash represent amounts held in money market funds and certificates of deposit, which approximates fair market value. Cash Equivalents are included in Cash and Cash Equivalents on the Consolidated Balance Sheets. Restricted Cash is included in Investments and Other Property and in Current Assets—Other on the Consolidated Balance Sheets.
(2) 
Energy Derivative Contracts include gas swap agreements (Level 2) and forward purchased power and sales contracts (Level 2 as of December 31, 2019 and Level 3 as of December 31, 2018) entered into to reduce exposure to energy price risk. These contracts are included in Derivative Instruments on the Consolidated Balance Sheets. In 2019, Derivative Contract Liabilities increased primarily due to decreases in forward market prices of natural gas and increases in volume.
Potential offset of assets by counterparty netting and cash collateral The tables below present the potential offset of counterparty netting and cash collateral.
 
Gross Amount Recognized in the Balance Sheets
 
Gross Amount Not Offset in the Balance Sheets
 
Net Amount
 
 
Counterparty Netting of Energy Contracts
 
Cash Collateral Received/Posted
 
(in millions)
December 31, 2019
Derivative Assets
 
 
 
 
 
 
 
Energy Derivative Contracts
$
6

 
$
4

 
$

 
$
2

Derivative Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts
(76
)
 
(4
)
 
(2
)
 
(70
)
(in millions)
December 31, 2018
Derivative Assets
 
 
 
 
 
 
 
Energy Derivative Contracts
$
12

 
$
11

 
$

 
$
1

Derivative Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts
(37
)
 
(11
)
 

 
(26
)

Potential offset of liabilities by counterparty netting and cash collateral The tables below present the potential offset of counterparty netting and cash collateral.
 
Gross Amount Recognized in the Balance Sheets
 
Gross Amount Not Offset in the Balance Sheets
 
Net Amount
 
 
Counterparty Netting of Energy Contracts
 
Cash Collateral Received/Posted
 
(in millions)
December 31, 2019
Derivative Assets
 
 
 
 
 
 
 
Energy Derivative Contracts
$
6

 
$
4

 
$

 
$
2

Derivative Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts
(76
)
 
(4
)
 
(2
)
 
(70
)
(in millions)
December 31, 2018
Derivative Assets
 
 
 
 
 
 
 
Energy Derivative Contracts
$
12

 
$
11

 
$

 
$
1

Derivative Liabilities
 
 
 
 
 
 
 
Energy Derivative Contracts
(37
)
 
(11
)
 

 
(26
)

Financial impact of energy contracts The table below presents amounts recorded in Operating Revenues on the Consolidated Statements of Income:
 
Years Ended December 31,
(in millions)
2019
 
2018
 
2017
Operating Revenues
$
6

 
$
5

 
$
5


The table below presents the unrealized gains and losses recorded to a regulatory asset or a regulatory liability in the balance sheet:
 
Years Ended December 31,
(in millions)
2019
 
2018
 
2017
Unrealized Net Loss (1)
$
(45
)
 
$
(9
)
 
$
(18
)
(1) 
In 2019, unrealized net loss on regulatory recoverable derivative contracts increased primarily due to decreases in forward market prices of natural gas and increases in volume.
Derivative volumes The following table presents volumes associated with the energy contracts:
 
December 31,
 
2019
 
2018
Power Contracts GWh
4,740

 
1,743

Gas Contracts BBtu
122,779

 
146,933


Following tables provide quantitative information regarding significant unobservable inputs in TEP’s Level 3 fair value measurements The following table provides quantitative information regarding significant unobservable inputs in TEP’s Level 3 fair value measurements:
 
Valuation Approach
 
Fair Value of
 
Unobservable Inputs
 
Range of Unobservable Inputs
 
 
Assets
 
Liabilities
 
 
(in millions)
December 31, 2018
Forward Power Contracts
Market approach
 
$
3

 
$
(2
)
 
Market price per MWh
 
$
16.80

 
$
47.05


Schedule of reconciliation of changes in the fair value of net assets and liabilities
The following table presents a reconciliation of changes in the fair value of net assets and liabilities classified as Level 3 in the fair value hierarchy and the gains (losses) attributable to the change in unrealized gains (losses) relating to assets (liabilities) still held at the end of the period:
 
Years Ended December 31,
(in millions)
2019
 
2018
Beginning of Period
$
1

 
$
2

Gains (Losses) Recorded
 
 
 
Regulatory Assets or Liabilities, Derivative Instruments
(12
)
 
(4
)
Operating Revenues
5

 
5

Settlements
1

 
(2
)
Transfers Out of Level 3 (1)
5

 

End of Period
$

 
$
1

 
 
 
 
Gains (Losses), Assets (Liabilities) Still Held
$

 
$
1


(1) 
Transferred from Level 3 to Level 2 because observable market data became available for the assets and liabilities.
Schedule of different estimation methods and/or market assumptions may yield different estimated fair value amounts The following table includes the net carrying value and estimated fair value of TEP's long-term debt:
 
 
 
Net Carrying Value
 
Fair Value
 
Fair Value Hierarchy
 
December 31,
(in millions)
 
2019
 
2018
 
2019
 
2018
Liabilities
 
 
 
 
 
 
 
 
 
Long-Term Debt, including Current Maturities
Level 2
 
$
1,602

 
$
1,615

 
$
1,755

 
$
1,672