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REVENUES: (Tables)
 6 Months Ended
Jun. 30, 2019
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue [Table Text Block]
The following table presents revenues from contracts with customers disaggregated by revenue source for the three and six months ended June 30, 2019 and 2018 (in thousands):
 
 
Three months ended
June 30,
 
Six months ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Revenues from contracts with customers:
 
 
 
 
 
 
 
 
Retail revenues:
 
 
 
 
 
 
 
 
 Residential (includes $7,232, $5,508, $18,543, and $19,052, respectively, related to the FCA)(1)
 
$
104,797

 
$
109,155

 
$
255,016

 
$
255,838

 Commercial (includes $350, $291, $691, and $652, respectively, related to the FCA)(1)
 
70,973

 
76,965

 
144,079

 
151,191

Industrial
 
45,602

 
48,868

 
91,100

 
94,660

Irrigation
 
48,954

 
65,065

 
49,953

 
65,471

Deferred revenue related to HCC relicensing AFUDC(2)
 
(1,927
)
 
(1,462
)
 
(4,046
)
 
(4,046
)
Total retail revenues
 
268,399

 
298,591

 
536,102

 
563,114

Less: FCA mechanism revenues(1)
 
(7,582
)
 
(5,799
)
 
(19,234
)
 
(19,704
)
Wholesale energy sales
 
16,158

 
8,919

 
63,373

 
22,685

Transmission wheeling-related revenues
 
12,518

 
14,500

 
28,246

 
26,198

Energy efficiency program revenues
 
11,458

 
8,802

 
21,570

 
16,399

Other revenues from contracts with customers
 
6,828

 
6,285

 
13,123

 
12,179

Total revenues from contracts with customers
 
$
307,779

 
$
331,298

 
$
643,180

 
$
620,871

(1) The FCA mechanism is an alternative revenue program in the Idaho jurisdiction and does not represent revenue from contracts with customers.
(2) As part of its January 30, 2009, general rate case order, the IPUC is allowing Idaho Power to recover a portion of the allowance for funds used during construction (AFUDC) on construction work in progress related to the Hells Canyon Complex (HCC) relicensing process, even though the relicensing process is not yet complete and the costs have not been moved to electric plant in service. Idaho Power is collecting $8.8 million annually in the Idaho jurisdiction but is deferring revenue recognition of the amounts collected until the license is issued and the accumulated license costs approved for recovery are placed in service.