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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Commitments
As of December 31, 2018, TEP had the following unconditional, minimum purchase obligations and operating leases:
(in millions)
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
Total
Fuel, Including Transportation
$
85

 
$
74

 
$
45

 
$
26

 
$
19

 
$
175

 
$
424

Purchased Power
20

 
—

 
—

 
—

 
—

 
—

 
20

Transmission
19

 
9

 
5

 
3

 
3

 
9

 
48

Renewable Power Purchase Agreements
64

 
63

 
63

 
63

 
63

 
605

 
921

RES Performance-Based Incentives
8

 
8

 
7

 
7

 
7

 
39

 
76

Operating Leases (1)
1

 
1

 
1

 
1

 
1

 
5

 
10

Land Easements and Rights-of-Way (2)
1

 
1

 
2

 
1

 
1

 
80

 
86

Total Purchase Commitments
$
198

 
$
156

 
$
123

 
$
101

 
$
94

 
$
913

 
$
1,585


(1) 
Primarily represents leases for land, rail cars, and communication towers with varying terms, provisions, and expiration dates through 2041. TEP's operating lease expense totaled $1 million in 2018 and 2017 and $2 million in 2016.
(2) 
Land easements and rights-of-way have varying terms and provisions and reflect expiration dates through 2054.