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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Commitments
As of December 31, 2019, TEP had the following unconditional minimum purchase obligations:
(in millions)
2020
 
2021
 
2022
 
2023
 
2024
 
Thereafter
 
Total
Fuel, Including Transportation
$
94

 
$
61

 
$
40

 
$
33

 
$
33

 
$
194

 
$
455

Purchased Power
8

 
—

 
—

 
—

 
—

 
—

 
8

Transmission
21

 
16

 
14

 
3

 
3

 
6

 
63

Renewable Power Purchase Agreements
63

 
63

 
63

 
63

 
62

 
543

 
857

RES Performance-Based Incentives
8

 
7

 
7

 
7

 
7

 
33

 
69

Land Easements and Rights-of-Way (1)
1

 
2

 
1

 
1

 
3

 
79

 
87

Total Purchase Commitments
$
195

 
$
149

 
$
125

 
$
107

 
$
108

 
$
855

 
$
1,539


(1) 
Land easements and rights-of-way have varying terms and provisions and reflect expiration dates through 2054.