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INCOME TAXES: Level 3 (Tables)
3 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
An analysis of income tax expense (benefit) for the three and nine months ended September 30 is as follows (in thousands of dollars): 
 
 
IDACORP
 
Idaho Power
 
 
2011
 
2010
 
2011
 
2010
Three months ended September 30,
 
 
 
 
 
 
 
 
Income tax at statutory rates (federal and state)
 
$
24,123

 
$
30,204

 
$
24,671

 
$
31,036

Additional ADITC amortization reversal
 
6,750

 
—

 
6,750

 
—

Accounting method change
 
—

 
(7,374
)
 
—

 
(7,374
)
Examination settlement - uniform capitalization
 
(56,898
)
 
—

 
(56,898
)
 
—

Other
 
(19,347
)
 
(12,715
)
 
(16,299
)
 
(8,936
)
Income tax (benefit) expense
 
$
(45,372
)
 
$
10,115

 
$
(41,776
)
 
$
14,726

Effective tax rate
 
(73.5
)%
 
13.1
 %
 
(66.2
)%
 
18.6
%
Nine months ended September 30,
 
 
 
 
 
 
 
 
Income tax at statutory rates (federal and state)
 
$
44,407

 
$
45,824

 
$
46,303

 
$
48,451

Accounting method change
 
—

 
(32,561
)
 
—

 
(32,561
)
Examination settlement - capitalized repairs
 
(3,428
)
 
—

 
(3,428
)
 
—

Examination settlement - uniform capitalization
 
(56,898
)
 
—

 
(56,898
)
 
—

Other
 
(28,218
)
 
(18,473
)
 
(22,974
)
 
(13,674
)
Income tax (benefit) expense
 
$
(44,137
)
 
$
(5,210
)
 
$
(36,997
)
 
$
2,216

Effective tax rate
 
(38.9
)%
 
(4.4
)%
 
(31.2
)%
 
1.8
%