Idaho Power 10-Q 4 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	3 Months Ended
	Mar. 31, 2017	Apr. 28, 2017
Document Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	IDA
Entity Registrant Name	IDACORP INC.
Entity Central Index Key	1,057,877
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		50,390,680
Entity Tax Identification Number	820,505,802
Idaho Power Company
Document Information
Entity Registrant Name	Idaho Power Company
Entity Central Index Key	49,648
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		39,150,812
Entity Tax Identification Number	820,130,980

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Revenues:
General business	$ 270,232	$ 253,380
Off-system sales	10,800	9,151
Other revenues	20,932	18,035
Total electric utility revenues	301,964	280,566
Other	580	390
Total operating revenues	302,544	280,956
Operating Expenses:
Purchased power	49,116	48,115
Fuel expense	36,252	35,764
Power cost adjustment	23,487	13,354
Other operations and maintenance	87,762	85,603
Energy efficiency programs	6,327	6,251
Depreciation	36,763	35,617
Taxes other than income taxes	8,678	8,738
Total electric utility expenses	248,385	233,442
Other	3,344	3,696
Total operating expenses	251,729	237,138
Operating Income	50,815	43,818
Other Income (Expense):
Allowance for equity funds used during construction	5,232	4,985
Earnings (losses) of unconsolidated equity-method investments	1,445	(42)
Other income (expense), net	2,397	2,204
Interest Expense:
Interest on long-term debt	20,298	20,897
Other interest	2,714	2,415
Allowance for borrowed funds used during construction	(2,312)	(2,244)
Total interest expense, net	20,700	21,068
Income Before Income Taxes	39,189	29,897
Income Tax Expense	6,183	4,367
Net Income	33,006	25,530
Adjustment for loss attributable to noncontrolling interests	96	199
Net Income Attributable to IDACORP, Inc.	$ 33,102	$ 25,729
Weighted Average Common Shares Outstanding - Basic (000’s)	50,356	50,299
Weighted Average Common Shares Outstanding - Diluted (000’s)	50,397	50,337
Earnings Per Share of Common Stock:
Earnings Attributable to IDACORP, Inc. - Basic (in dollars per share)	$ 0.66	$ 0.51
Earnings Attributable to IDACORP, Inc. - Diluted (in dollars per share)	0.66	0.51
Dividends Declared Per Share of Common Stock	$ 0.55	$ 0.51
Idaho Power Company
Operating Revenues:
General business	$ 270,232	$ 253,380
Off-system sales	10,800	9,151
Other revenues	20,932	18,035
Total electric utility revenues	301,964	280,566
Operating Expenses:
Purchased power	49,116	48,115
Fuel expense	36,252	35,764
Power cost adjustment	23,487	13,354
Other operations and maintenance	87,762	85,603
Energy efficiency programs	6,327	6,251
Depreciation	36,763	35,617
Taxes other than income taxes	8,678	8,738
Total electric utility expenses	248,385	233,442
Operating Income	53,579	47,124
Other Income (Expense):
Allowance for equity funds used during construction	5,232	4,985
Earnings (losses) of unconsolidated equity-method investments	1,254	(93)
Other income (expense), net	(526)	(811)
Total other income	5,960	4,081
Interest Expense:
Interest on long-term debt	20,298	20,897
Other interest	2,698	2,350
Allowance for borrowed funds used during construction	(2,312)	(2,244)
Total interest expense, net	20,684	21,003
Income Before Income Taxes	38,855	30,202
Income Tax Expense	6,373	4,668
Net Income	$ 32,482	$ 25,534

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Income	$ 33,006	$ 25,530
Other Comprehensive Income:
Unfunded pension liability adjustment (net of tax)	471	564
Total Comprehensive Income	33,477	26,094
Comprehensive (income) loss attributable to noncontrolling interests	96	199
Comprehensive Income Attributable to IDACORP, Inc.	33,573	26,293
Idaho Power Company
Net Income	32,482	25,534
Other Comprehensive Income:
Unfunded pension liability adjustment (net of tax)	471	564
Total Comprehensive Income	$ 32,953	$ 26,098

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Unfunded pension liability adjustment, tax	$ 302	$ 361
Idaho Power Company
Unfunded pension liability adjustment, tax	$ 302	$ 361

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets Statement - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 47,010	$ 61,480
Receivables:
Customer	80,981	71,557
Other	5,028	15,280
Taxes receivable	10,933	12,781
Accrued unbilled revenues	52,645	80,738
Materials and supplies (at average cost)	59,374	57,858
Fuel stock (at average cost)	56,059	53,698
Prepayments	12,436	18,389
Current regulatory assets	82,275	62,570
Other	2,316	5,961
Total current assets	409,057	440,312
Investments	117,189	125,164
Property, Plant and Equipment:
Utility plant in service	5,758,081	5,732,044
Accumulated provision for depreciation	(2,016,360)	(1,988,477)
Utility plant in service - net	3,741,721	3,743,567
Construction work in progress	428,538	405,069
Utility plant held for future use	7,511	7,441
Other property, net of accumulated depreciation	15,810	15,922
Property, plant and equipment - net	4,193,580	4,171,999
Other Assets:
American Falls and Milner water rights	8,162	9,487
Company-owned life insurance	57,927	57,553
Regulatory assets	1,366,972	1,409,329
Long-term receivables	24,598	23,482
Other	52,463	52,571
Total other assets	1,510,122	1,552,422
Total	6,229,948	6,289,897
Current Liabilities:
Current maturities of long-term debt	0	1,064
Notes payable	0	21,800
Accounts payable	63,225	106,194
Taxes accrued	17,763	11,348
Interest accrued	21,406	22,377
Accrued compensation	27,411	45,787
Current regulatory liabilities	16,951	9,944
Advances from customers	22,738	21,438
Other	11,290	9,763
Total current liabilities	180,784	249,715
Other Liabilities:
Deferred income taxes	1,248,432	1,244,250
Regulatory liabilities	431,262	436,845
Pension and other postretirement benefits	417,780	411,523
Other	43,686	45,084
Total other liabilities	2,141,160	2,137,702
Long-Term Debt	1,744,991	1,744,614
Commitments and Contingencies
Equity:
Common stock	852,663	851,833
Retained earnings	1,328,489	1,323,198
Accumulated other comprehensive loss	(20,411)	(20,882)
Treasury stock	(1,592)	(243)
Total IDACORP, Inc. shareholders’ equity	2,159,149	2,153,906
Noncontrolling interests	3,864	3,960
Total equity	2,163,013	2,157,866
Total	6,229,948	6,289,897
Idaho Power Company
Current Assets:
Cash and cash equivalents	44,568	44,140
Receivables:
Customer	80,981	71,557
Other	5,287	7,555
Taxes receivable	0	23,334
Accrued unbilled revenues	52,645	80,738
Materials and supplies (at average cost)	59,374	57,858
Fuel stock (at average cost)	56,059	53,698
Prepayments	12,298	18,270
Current regulatory assets	82,275	62,570
Other	2,317	5,962
Total current assets	395,804	425,682
Investments	99,728	107,379
Property, Plant and Equipment:
Utility plant in service	5,758,081	5,732,044
Accumulated provision for depreciation	(2,016,360)	(1,988,477)
Utility plant in service - net	3,741,721	3,743,567
Construction work in progress	428,538	405,069
Utility plant held for future use	7,511	7,441
Property, plant and equipment - net	4,177,770	4,156,077
Other Assets:
American Falls and Milner water rights	8,162	9,487
Company-owned life insurance	57,927	57,553
Regulatory assets	1,366,972	1,409,329
Other	72,285	71,237
Total other assets	1,505,346	1,547,606
Total	6,178,648	6,236,744
Current Liabilities:
Current maturities of long-term debt	0	1,064
Notes payable	0	21,800
Accounts payable	63,110	105,846
Accounts payable to affiliates	250	1,056
Taxes accrued	19,634	11,348
Interest accrued	21,406	22,377
Accrued compensation	27,298	45,622
Current regulatory liabilities	16,951	9,944
Advances from customers	22,738	21,438
Other	10,927	9,103
Total current liabilities	182,314	249,598
Other Liabilities:
Deferred income taxes	1,355,738	1,351,415
Regulatory liabilities	431,262	436,845
Pension and other postretirement benefits	417,780	411,523
Other	42,817	44,046
Total other liabilities	2,247,597	2,243,829
Long-Term Debt	1,744,991	1,744,614
Commitments and Contingencies
Equity:
Common stock	97,877	97,877
Premium on capital stock	712,258	712,258
Capital stock expense	(2,097)	(2,097)
Retained earnings	1,216,119	1,211,547
Accumulated other comprehensive loss	(20,411)	(20,882)
Total equity	2,003,746	1,998,703
Total capitalization	3,748,737	3,743,317
Total	$ 6,178,648	$ 6,236,744

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets (Parenthetical) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable, Current	$ 1,405	$ 968
Allowance for Doubtful Other Receivables, Current	120	164
Allowance for Doubtful Accounts Receivable, Noncurrent	$ 402	$ 402
Common Stock, No Par Value
Common Stock, Shares Authorized	120,000,000	120,000,000
Common Stock, Shares, Issued	50,420,017	50,420,017
Treasury Stock, Shares	29,337	23,244
Idaho Power Company
Allowance for Doubtful Accounts Receivable, Current	$ 1,405	$ 968
Allowance for Doubtful Other Receivables, Current	$ 120	$ 164
Common Stock, Par or Stated Value Per Share	$ 2.50	$ 2.50
Common Stock, Shares Authorized	50,000,000	50,000,000
Common Stock, Shares, Issued	39,150,812	39,150,812

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net Income	$ 33,006	$ 25,530
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,728	36,145
Deferred income taxes and investment tax credits	4,394	6,425
Changes in regulatory assets and liabilities	33,049	5,075
Pension and postretirement benefit plan expense	7,340	7,425
Contributions to pension and postretirement benefit plans	(2,105)	(1,654)
Earnings (losses) of unconsolidated equity-method investments	(1,445)	42
Distributions from unconsolidated equity-method investments	10,600	2,814
Allowance for equity funds used during construction	(5,232)	(4,985)
Other non-cash adjustments to net income, net	2,921	1,923
Change in:
Accounts receivable	494	4,728
Accounts payable and other accrued liabilities	(48,935)	(43,305)
Taxes accrued/receivable	8,264	5,225
Other current assets	29,952	10,782
Other current liabilities	6,447	13,929
Other assets	(2,043)	(2,473)
Other liabilities	(739)	(1,450)
Net cash provided by operating activities	113,696	66,176
Investing Activities:
Additions to property, plant and equipment	(73,904)	(54,659)
Payments received from transmission project joint funding partners	701	0
Proceeds from the sale of emission allowances and renewable energy certificates	873	418
Purchase of available-for-sale securities	(2,771)	(61)
Proceeds from the sale of available-for-sale securities	1,120	1,085
Other	(72)	(4)
Net cash used in investing activities	(74,053)	(53,221)
Financing Activities:
Issuance of long-term debt	0	120,000
Retirement of long-term debt	(1,064)	(1,064)
Dividends on common stock	(28,087)	(26,087)
Net change in short-term borrowings	(21,800)	3,300
Acquisition of treasury stock	(3,162)	(3,084)
Other	0	(1,139)
Net cash (used in) provided by financing activities	(54,113)	91,926
Net (decrease) increase in cash and cash equivalents	(14,470)	104,881
Cash and cash equivalents at beginning of the period	61,480	114,802
Cash and cash equivalents at end of the period	47,010	219,683
Supplemental Disclosure of Cash Flow Information:
Income taxes	2	2
Interest (net of amount capitalized)	20,738	18,172
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	20,416	17,993
Idaho Power Company
Operating Activities:
Net Income	32,482	25,534
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,577	35,993
Deferred income taxes and investment tax credits	4,021	6,217
Changes in regulatory assets and liabilities	33,049	5,075
Pension and postretirement benefit plan expense	7,340	7,425
Contributions to pension and postretirement benefit plans	(2,105)	(1,654)
Earnings (losses) of unconsolidated equity-method investments	(1,254)	93
Distributions from unconsolidated equity-method investments	10,600	2,814
Allowance for equity funds used during construction	(5,232)	(4,985)
Other non-cash adjustments to net income, net	299	(204)
Change in:
Accounts receivable	(8,271)	3,012
Accounts payable and other accrued liabilities	(48,727)	(43,282)
Taxes accrued/receivable	31,620	10,723
Other current assets	29,970	10,790
Other current liabilities	6,498	13,963
Other assets	(2,043)	(2,473)
Other liabilities	(568)	(1,217)
Net cash provided by operating activities	125,256	67,824
Investing Activities:
Additions to property, plant and equipment	(73,904)	(54,657)
Payments received from transmission project joint funding partners	701	0
Proceeds from the sale of emission allowances and renewable energy certificates	873	418
Purchase of available-for-sale securities	(2,771)	(61)
Proceeds from the sale of available-for-sale securities	1,120	1,085
Other	(72)	(4)
Net cash used in investing activities	(74,053)	(53,219)
Financing Activities:
Issuance of long-term debt	0	120,000
Retirement of long-term debt	(1,064)	(1,064)
Dividends on common stock	(27,911)	(25,836)
Net change in short-term borrowings	(21,800)	0
Other	0	(1,139)
Net cash (used in) provided by financing activities	(50,775)	91,961
Net (decrease) increase in cash and cash equivalents	428	106,566
Cash and cash equivalents at beginning of the period	44,140	110,756
Cash and cash equivalents at end of the period	44,568	217,322
Supplemental Disclosure of Cash Flow Information:
Income taxes	(22,861)	(5,280)
Interest (net of amount capitalized)	20,721	18,107
Non-cash investing activities:
Additions to property, plant and equipment in accounts payable	$ 20,416	$ 17,993

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Equity $ in Thousands	USD ($)
Balance at beginning of period at Dec. 31, 2015	$ 849,112
Common Stock
Other common stock changes	(985)
Balance at end of period at Mar. 31, 2016	848,361
Balance at beginning of period at Dec. 31, 2015	1,230,105
Retained Earnings
Net Income Attributable to IDACORP, Inc.	25,729
Common stock dividends	(25,713)
Balance at end of period at Mar. 31, 2016	1,229,887
AOCI - Beginning Balance at Dec. 31, 2015	(21,276)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment (net of tax)	564
AOCI - Ending Balance at Mar. 31, 2016	(20,712)
Balance at beginning of period at Dec. 31, 2015	(57)
Treasury Stock
Issued	3,112
Acquired	(3,084)
Balance at end of period at Mar. 31, 2016	(29)
Balance at beginning of period at Dec. 31, 2015	4,160
Noncontrolling Interests
Net loss attributable to noncontrolling interests	(199)
Balance at end of period at Mar. 31, 2016	3,961
Common Stock
Cumulative Effect of New Accounting Principle ASU 2016-09 in Period of Adoption	234
Treasury Stock
Total IDACORP, Inc. shareholders’ equity at end of period	2,057,507
Noncontrolling Interests
Total equity at end of period	2,061,468
Total IDACORP, Inc. shareholders’ equity at end of period	2,153,906
Total equity at end of period	2,157,866
Balance at beginning of period at Dec. 31, 2016	851,833
Common Stock
Other common stock changes	830
Balance at end of period at Mar. 31, 2017	852,663
Balance at beginning of period at Dec. 31, 2016	1,323,198
Retained Earnings
Net Income Attributable to IDACORP, Inc.	33,102
Common stock dividends	(27,811)
Balance at end of period at Mar. 31, 2017	1,328,489
AOCI - Beginning Balance at Dec. 31, 2016	(20,882)
Accumulated Other Comprehensive (Loss) Income
Unfunded pension liability adjustment (net of tax)	471
AOCI - Ending Balance at Mar. 31, 2017	(20,411)
Balance at beginning of period at Dec. 31, 2016	(243)
Treasury Stock
Issued	1,813
Acquired	(3,162)
Balance at end of period at Mar. 31, 2017	(1,592)
Balance at beginning of period at Dec. 31, 2016	3,960
Noncontrolling Interests
Net loss attributable to noncontrolling interests	(96)
Balance at end of period at Mar. 31, 2017	3,864
Common Stock
Cumulative Effect of New Accounting Principle ASU 2016-09 in Period of Adoption	0
Treasury Stock
Total IDACORP, Inc. shareholders’ equity at end of period	2,159,149
Noncontrolling Interests
Total equity at end of period	$ 2,163,013

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Equity (Parenthetical) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Dividends Declared Per Share of Common Stock	$ 0.55	$ 0.51

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES This Quarterly Report on Form 10-Q is a combined report of IDACORP, Inc. (IDACORP) and Idaho Power Company (Idaho Power). Therefore, these Notes to Condensed Consolidated Financial Statements apply to both IDACORP and Idaho Power. However, Idaho Power makes no representation as to the information relating to IDACORP’s other operations. Nature of Business IDACORP is a holding company formed in 1998 whose principal operating subsidiary is Idaho Power. Idaho Power is an electric utility engaged in the generation, transmission, distribution, sale, and purchase of electric energy and capacity with a service area covering approximately 24,000 square miles in southern Idaho and eastern Oregon. Idaho Power is regulated primarily by the state utility regulatory commissions of Idaho and Oregon and the Federal Energy Regulatory Commission (FERC). Idaho Power is the parent of Idaho Energy Resources Co. (IERCo), a joint venturer in Bridger Coal Company (BCC), which mines and supplies coal to the Jim Bridger generating plant owned in part by Idaho Power. IDACORP’s other wholly-owned subsidiaries include IDACORP Financial Services, Inc. (IFS), an investor in affordable housing and other real estate investments; Ida-West Energy Company (Ida-West), an operator of small hydroelectric generation projects that satisfy the requirements of the Public Utility Regulatory Policies Act of 1978 (PURPA); and IDACORP Energy Services Co. (IESCo), which is the former limited partner of, and current successor by merger to, IDACORP Energy L.P., a marketer of energy commodities that wound down operations in 2003. Regulation of Utility Operations As a regulated utility, many of Idaho Power's fundamental business decisions are subject to the approval of governmental agencies, including the prices that Idaho Power is authorized to charge for its electric service. These approvals are a critical factor in determining IDACORP's and Idaho Power's results of operations and financial condition. IDACORP's and Idaho Power's financial statements reflect the effects of the different ratemaking principles followed by the jurisdictions regulating Idaho Power. The application of accounting principles related to regulated operations sometimes results in Idaho Power recording expenses and revenues in a different period than when an unregulated enterprise would record such expenses and revenues. In these instances, the amounts are deferred or accrued as regulatory assets or regulatory liabilities on the balance sheet and recorded on the income statement when recovered or returned through rates. Additionally, regulators can impose regulatory liabilities upon a regulated company for amounts previously collected from customers that are expected to be refunded. The effects of applying these regulatory accounting principles to Idaho Power's operations are discussed in more detail in Note 3. Financial Statements In the opinion of management of IDACORP and Idaho Power, the accompanying unaudited condensed consolidated financial statements contain all adjustments necessary to present fairly each company's consolidated financial position as of March 31, 2017 , consolidated results of operations for the three months ended March 31, 2017 and 2016 , and consolidated cash flows for the three months ended March 31, 2017 and 2016 . These adjustments are of a normal and recurring nature. These financial statements do not contain the complete detail or footnote disclosure concerning accounting policies and other matters that would be included in full-year financial statements and should be read in conjunction with the audited consolidated financial statements included in IDACORP’s and Idaho Power’s Annual Report on Form 10-K for the year ended December 31, 2016 . The results of operations for the interim period are not necessarily indicative of the results to be expected for the full year. A change in management's estimates or assumptions could have a material impact on IDACORP's or Idaho Power's respective financial condition and results of operations during the period in which such change occurred. Management Estimates Management makes estimates and assumptions when preparing financial statements in conformity with generally accepted accounting principles. These estimates and assumptions include those related to rate regulation, retirement benefits, contingencies, litigation, asset impairment, income taxes, unbilled revenues, and bad debt. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates involve judgments with respect to, among other things, future economic factors that are difficult to predict and are beyond management's control. Accordingly, actual results could differ from those estimates. Reclassifications In these consolidated financial statements, certain immaterial amounts in prior periods' consolidated financial statements and footnotes have been reclassified to conform with the current period presentation. New and Recently Adopted Accounting Pronouncements Recent Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 is intended to enable users of financial statements to better understand and consistently analyze an entity's revenue across industries, transactions, and geographies. Under the ASU, recognition of revenue occurs when a customer obtains control of promised goods or services. In addition, the ASU requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The FASB amended certain aspects of ASU 2014-09 to clarify the implementation guidance, including clarifications related to principal versus agent considerations, licensing and identifying performance obligations, narrow scope improvements, and practical expedients. While the companies continue to assess the impacts of ASU 2014-09 on their financial statements, including disclosure requirements, the companies do not expect the new guidance to significantly affect revenue recognition for tariff-based sales, which represent a significant majority of the companies' general business revenue. Accordingly, the companies do not expect the adoption of ASU 2014-09 to have a material effect on their financial statements. However, a number of industry-specific implementation issues are still unresolved and could affect the companies' accounting for contributions in aid of construction, sales of renewable energy credits, alternative revenue programs, and recognition of revenue when collectability is in question. The guidance in ASU 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017. The guidance permits two implementation approaches, one requiring retrospective application of the new standard with restatement of prior years (full retrospective approach) and the other requiring prospective application of the new standard including a cumulative-effect adjustment with disclosure of results under previous standards (modified-retrospective approach). IDACORP and Idaho Power plan to adopt ASU 2014-09 on January 1, 2018, using the modified-retrospective approach. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), intended to improve financial reporting on leasing transactions. The ASU significantly changes the accounting model used by lessees to account for leases, requiring that all material leases be presented on the balance sheet. Under the current model, some leases are classified as capital leases and recorded on the balance sheet while other leases classified as operating leases are not recognized on the balance sheet. The new standard is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The standard must be adopted using a modified retrospective approach. IDACORP and Idaho Power are evaluating the impact of ASU 2016-02 on their financial statements. At this time, the companies do not know, and cannot reasonably estimate, the dollar impact of the adoption. Specifically, the companies are considering whether the new guidance will affect their accounting for purchase power agreements, easements and rights-of-way, utility pole attachments, and other utility industry-related areas. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) , which amends ASC 230 to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The FASB issued the ASU with the intent of reducing diversity in practice with respect to eight types of cash flows. The companies expect the ASU to affect the classification of proceeds from the settlement of corporate-owned life insurance policies and related costs, which will be classified as investing activities under the new guidance. The companies already present debt prepayment and extinguishment costs, proceeds from the settlement of insurance claims (other than corporate-owned life insurance), and distributions received from equity-method investments in accordance with the new guidance. ASU 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. The standard must be adopted retrospectively to all periods presented, unless impracticable to do so. IDACORP and Idaho Power do not believe the adoption will have a material impact on their financial statements. In March 2017, the FASB issued ASU 2017-07, Compensation -- Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires employers to disaggregate the service cost component from other components of net periodic benefit costs and to disclose the amounts of net periodic benefit costs that are included in each income statement line item. The standard requires employers to present the service cost component in the same line item as other compensation costs and to present the other components of net periodic benefit costs (which include interest costs, expected return on plan assets, amortization of prior service cost or credits and actuarial gains and losses) separately and outside a subtotal of operating income. In addition, only the service cost component is eligible for capitalization. The amendments in ASU 2017-07 are effective for interim and annual reporting periods beginning after December 15, 2017. Entities must use (1) a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and (2) a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. IDACORP and Idaho Power are evaluating the impact of ASU 2017-07 on their financial statements.

INCOME TAXES_

INCOME TAXES:	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES In accordance with interim reporting requirements, IDACORP and Idaho Power use an estimated annual effective tax rate for computing their provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual effective tax rate is applied to year-to-date pretax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period's year-to-date amount. Income Tax Expense The following table provides a summary of income tax expense for the three months ended March 31 (in thousands): IDACORP Idaho Power 2017 2016 2017 2016 Income tax at statutory rates (federal and state) $ 15,360 $ 11,768 $ 15,192 $ 11,809 Additional ADITC amortization (1,875 ) (500 ) (1,875 ) (500 ) Share-based compensation (1,559 ) (1,622 ) (1,530 ) (1,587 ) Other (1) (5,743 ) (5,279 ) (5,414 ) (5,054 ) Income tax expense $ 6,183 $ 4,367 $ 6,373 $ 4,668 Effective tax rate 15.7 % 14.6 % 16.4 % 15.5 % (1) "Other" is primarily comprised of the net tax effect of Idaho Power's regulatory flow-through tax adjustments. These adjustments, which include the capitalized repairs deduction, are each listed in the rate reconciliation table in Note 2 to the consolidated financial statements included in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2016. The increases in income tax expense for the three months ended March 31, 2017 , as compared to the same period in 2016 , were primarily due to greater pre-tax income, net of increased additional accumulated deferred investment tax credit (ADITC) amortization under the regulatory mechanism described in Note 3. On a net basis, Idaho Power’s estimate of its annual 2017 regulatory flow-through tax adjustments is comparable to 2016 .

REGULATORY MATTERS_

REGULATORY MATTERS:	3 Months Ended
	Mar. 31, 2017
Public Utilities, Rate Matters [Abstract]
Regulatory Matters	REGULATORY MATTERS Included below is a summary of Idaho Power's most recent general rate cases and base rate changes, as well as other recent or pending notable regulatory matters and proceedings. Idaho and Oregon General Rate Cases and Base Rate Adjustments Effective January 1, 2012, Idaho Power implemented new Idaho base rates resulting from its receipt of an order from the Idaho Public Utilities Commission (IPUC) approving a settlement stipulation that provided for a 7.86 percent authorized rate of return on an Idaho-jurisdiction rate base of approximately $2.36 billion . The settlement stipulation resulted in a $34.0 million overall increase in Idaho Power's annual Idaho-jurisdictional base rate revenues. Neither the IPUC's order nor the settlement stipulation specified an authorized rate of return on equity. Effective March 1, 2012, Idaho Power implemented new Oregon base rates resulting from its receipt of an order from the Public Utility Commission of Oregon (OPUC) approving a settlement stipulation that provided for a $1.8 million base rate revenue increase, a return on equity of 9.9 percent , and an overall rate of return of 7.757 percent in the Oregon jurisdiction. Idaho and Oregon base rates were subsequently adjusted again in 2012, in connection with Idaho Power's completion of the Langley Gulch power plant. In June 2012, the IPUC issued an order approving a $58.1 million increase in annual Idaho-jurisdiction base rate revenues, effective July 1, 2012, for inclusion of the investment and associated costs of the plant in rates. The order also provided for a $335.9 million increase in Idaho rate base. In September 2012, the OPUC issued an order approving a $3.0 million increase in annual Oregon jurisdiction base rate revenues, effective October 1, 2012, for inclusion of the investment and associated costs of the plant in Oregon rates. In March 2014, the IPUC issued an order approving Idaho Power's application requesting an increase of approximately $106 million in the normalized or "base level" net power supply expense on a total-system basis to be used to update base rates and in the determination of the Idaho power cost adjustment (PCA) rate that became effective June 1, 2014. Approval of the order removed the Idaho-jurisdictional portion of those expenses (approximately $99 million ) from collection via the PCA mechanism and instead results in collecting that portion through base rates. Idaho Settlement Stipulation — Investment Tax Credits and Sharing Mechanism In October 2014, the IPUC issued an order approving an extension, with modifications, of the terms of a December 2011 Idaho settlement stipulation for the period from 2015 through 2019, or until the terms are otherwise modified or terminated by order of the IPUC. The provisions of the October 2014 settlement stipulation are as follows: • If Idaho Power's annual return on year-end equity in the Idaho jurisdiction (Idaho ROE) in any year is less than 9.5 percent , then Idaho Power may amortize up to $25 million of additional ADITC to help achieve a 9.5 percent Idaho ROE for that year, and may amortize up to a total of $45 million of additional ADITC over the 2015 through 2019 period. • If Idaho Power's annual Idaho ROE in any year exceeds 10.0 percent , the amount of earnings exceeding a 10.0 percent Idaho ROE and up to and including a 10.5 percent Idaho ROE will be allocated 75 percent to Idaho Power's Idaho customers as a rate reduction to be effective at the time of the subsequent year's PCA and 25 percent to Idaho Power. • If Idaho Power's annual Idaho ROE in any year exceeds 10.5 percent , the amount of earnings exceeding a 10.5 percent Idaho ROE will be allocated 50 percent to Idaho Power's Idaho customers as a rate reduction to be effective at the time of the subsequent year's PCA, 25 percent to Idaho Power's Idaho customers in the form of a reduction to the pension regulatory asset balancing account (to reduce the amount to be collected in the future from Idaho customers), and 25 percent to Idaho Power. • If the full $45 million of additional ADITC contemplated by the settlement stipulation has been amortized the sharing provisions would terminate. • In the event the IPUC approves a change to Idaho Power's Idaho-jurisdictional allowed return on equity as part of a general rate case proceeding seeking a rate change effective prior to January 1, 2020, the Idaho ROE thresholds ( 9.5 percent , 10.0 percent , and 10.5 percent ) will be adjusted prospectively, prorated for intra-year rate changes. Under the October 2014 settlement stipulation, Idaho Power recorded $1.9 million of additional ADITC amortization during the first quarter of 2017 based on its estimate of Idaho ROE for the full-year 2017. During the first quarter of 2016, Idaho Power recorded $0.5 million of additional ADITC amortization which was reversed later in 2016 as actual financial results exceeded these early estimates. Idaho Power Cost Adjustment Mechanisms In both its Idaho and Oregon jurisdictions, Idaho Power's power cost adjustment mechanisms address the volatility of power supply costs and provide for annual adjustments to the rates charged to its retail customers. The power cost adjustment mechanisms compare Idaho Power's actual net power supply costs (primarily fuel and purchased power less off-system sales) against net power supply costs being recovered in Idaho Power's retail rates. Under the power cost adjustment mechanisms, certain differences between actual net power supply costs incurred by Idaho Power and costs being recovered in retail rates are recorded as a deferred charge or credit on the balance sheet for future recovery or refund. The power supply costs deferred primarily result from changes in contracted power purchase prices and volumes, changes in wholesale market prices and transaction volumes, fuel prices, and the levels of Idaho Power's own generation. In April 2017, Idaho Power filed an application with the IPUC requesting a $10.6 million net increase in PCA rates, effective for the 2017-2018 PCA collection period from June 1, 2017, to May 31, 2018. The requested net increase in PCA rates is primarily due to expected higher power supply costs resulting from new PURPA power purchase agreements and higher coal-fired generation costs and also last year’s lower-than-expected hydroelectric generation. The requested net increase includes an offsetting $13.0 million refund of previously collected Idaho energy efficiency rider funds. As of the date of this report, the IPUC has not yet issued an order on the application. Previously, in May 2016, the IPUC issued an order approving a $17.3 million net increase in PCA rates, effective for the 2016-2017 PCA collection period from June 1, 2016 to May 31, 2017. The requested net increase in PCA rates included the application of (a) a customer rate credit of $3.2 million for sharing with customers for the year 2015 pursuant to the terms of the October 2014 settlement stipulation described above and (b) a $4.0 million reduction due to the transfer of Idaho energy efficiency rider funds. Idaho Fixed Cost Adjustment Mechanism The Idaho jurisdiction fixed cost adjustment (FCA) mechanism is designed to remove Idaho Power’s financial disincentive to invest in energy efficiency programs by separating (or decoupling) the recovery of fixed costs from the variable kilowatt-hour charge and instead linking it to a set amount per customer. The FCA mechanism is adjusted each year to collect, or refund, the difference between the authorized fixed-cost recovery amount and the actual fixed costs recovered by Idaho Power during the year. In March 2017, Idaho Power filed its annual FCA update with the IPUC, requesting an increase of $6.9 million in the FCA from $28.1 million to $35.0 million , with new requested rates effective for the period from June 1, 2017 to May 31, 2018. As of the date of this report, the IPUC has not yet issued an order on the application. Previously in May 2016, the IPUC issued an order approving Idaho Power's application requesting an increase of $11.2 million in the FCA from $16.9 million to $28.1 million , with new rates effective for the period from June 1, 2016 to May 31, 2017. Depreciation Rate Requests In October and November 2016, Idaho Power filed applications with the IPUC and OPUC, respectively, requesting authorization to (a) accelerate depreciation for the North Valmy coal-fired power plant (Valmy Plant), to allow the plant to be fully depreciated by December 31, 2025, (b) establish a balancing account to track the incremental costs and benefits associated with the accelerated depreciation date, and (c) adjust customer rates to recover the associated incremental annual levelized revenue requirement. On May 3, 2017, Idaho Power filed a settlement stipulation with the IPUC to resolve the issues among the parties to the Valmy Plant matter. The settlement stipulation, if approved, would provide for an increase in the Idaho jurisdictional revenue requirement of $13.3 million , effective June 1, 2017, to recover costs associated with the accelerated depreciation of existing investments for unit 1 and unit 2 at the Valmy Plant to be amortized through 2028 with an assumed Idaho Power cessation of coal-fired operations at unit 1 at the end of 2019 and unit 2 at the end of 2025. The costs also include forecasted investments for the Valmy Plant from 2017 through 2019 for unit 1, forecasted operation and maintenance costs savings, and decommissioning costs for unit 1 and unit 2. The settlement stipulation also contains provisions requiring future filings with the IPUC that may result in periodic adjustments to rates based upon prudence reviews of capital expenditures, true-ups of actual capital expenditures and decommissioning costs to forecasted costs, true-ups of operating and maintenance expense savings, and plant closure or joint ownership and operating agreement negotiations. In October and November 2016, Idaho Power also filed applications with the IPUC and OPUC requesting approval to institute revised depreciation rates for Idaho Power's other electric plant-in-service and adjust base rates to reflect the revised depreciation rates applied to electric plant-in-service balances subject to the most recent general rate case. On May 3, 2017, Idaho Power filed a settlement stipulation with the IPUC to resolve the issues among the parties to the Idaho depreciation case. The settlement stipulation, if approved, would provide for new depreciation rates to go into effect on June 1, 2017, that would result in no required increase in Idaho jurisdictional revenue. Idaho Power expects the IPUC and the OPUC to enter final orders in both matters in 2017.

NOTES PAYABLE_

NOTES PAYABLE:	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Notes Payable	NOTES PAYABLE Credit Facilities IDACORP and Idaho Power have in place credit facilities that may be used for general corporate purposes and commercial paper backup. The terms and conditions of those credit facilities are as described in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2016 . At March 31, 2017 , no loans were outstanding under either IDACORP's or Idaho Power's facilities. At March 31, 2017 , Idaho Power had regulatory authority to incur up to $450 million in principal amount of short-term indebtedness at any one time outstanding. Balances (in thousands) and interest rates of IDACORP’s and Idaho Power's short-term borrowings were as follows at March 31, 2017 and December 31, 2016 : March 31, 2017 December 31, 2016 IDACORP Idaho Power Total IDACORP Idaho Power Total Commercial paper outstanding $ — $ — $ — $ — $ 21,800 $ 21,800 Weighted-average annual interest rate — % — % — % — % 1.13 % 1.13 %

COMMON STOCK_

COMMON STOCK:	3 Months Ended
	Mar. 31, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock	COMMON STOCK IDACORP Common Stock During the three months ended March 31, 2017 , IDACORP granted 72,397 restricted stock unit awards to employees and 12,050 restricted stock awards to directors, but made no original issuances of shares of common stock pursuant to the IDACORP, Inc. 2000 Long-Term Incentive and Compensation Plan. As directed by IDACORP, plan administrators of the IDACORP, Inc. Dividend Reinvestment and Stock Purchase Plan and Idaho Power Company Employee Savings Plan use market purchases of IDACORP common stock, as opposed to original issuance of common stock from IDACORP, to acquire shares of IDACORP common stock for the plans. However, IDACORP may determine at any time to use original issuances of common stock under those plans. Restrictions on Dividends Idaho Power’s ability to pay dividends on its common stock held by IDACORP and IDACORP’s ability to pay dividends on its common stock are limited to the extent payment of such dividends would violate the covenants in their respective credit facilities or Idaho Power’s Revised Policy and Code of Conduct. A covenant under IDACORP’s credit facility and Idaho Power’s credit facility requires IDACORP and Idaho Power to maintain leverage ratios of consolidated indebtedness to consolidated total capitalization, as defined therein, of no more than 65 percent at the end of each fiscal quarter. At March 31, 2017 , the leverage ratios for IDACORP and Idaho Power were 45 percent and 47 percent , respectively. Based on these restrictions, IDACORP’s and Idaho Power’s dividends were limited to $1.2 billion and $1.1 billion , respectively, at March 31, 2017 . There are additional facility covenants, subject to exceptions, that prohibit or restrict the sale or disposition of property without consent and any agreements restricting dividend payments to the applicable company from any material subsidiary. At March 31, 2017 , IDACORP and Idaho Power were in compliance with the financial covenants. Idaho Power’s Revised Policy and Code of Conduct relating to transactions between and among Idaho Power, IDACORP, and other affiliates, which was approved by the IPUC in April 2008, provides that Idaho Power will not pay any dividends to IDACORP that will reduce Idaho Power’s common equity capital below 35 percent of its total adjusted capital without IPUC approval. At March 31, 2017 , Idaho Power's common equity capital was 54 percent of its total adjusted capital. Further, Idaho Power must obtain approval of the OPUC before it can directly or indirectly loan funds or issue notes or give credit on its books to IDACORP. Idaho Power’s articles of incorporation contain restrictions on the payment of dividends on its common stock if preferred stock dividends are in arrears. As of the date of this report, Idaho Power has no preferred stock outstanding. In addition to contractual restrictions on the amount and payment of dividends, the Federal Power Act prohibits the payment of dividends from "capital accounts." The term "capital account" is undefined in the Federal Power Act or its regulations, but Idaho Power does not believe the restriction would limit Idaho Power's ability to pay dividends out of current year earnings or retained earnings.

EARNINGS PER SHARE_

EARNINGS PER SHARE:	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The table below presents the computation of IDACORP’s basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 (in thousands, except for per share amounts). Three months ended 2017 2016 Numerator: Net income attributable to IDACORP, Inc. $ 33,102 $ 25,729 Denominator: Weighted-average common shares outstanding - basic 50,356 50,299 Effect of dilutive securities 41 38 Weighted-average common shares outstanding - diluted 50,397 50,337 Basic earnings per share $ 0.66 $ 0.51 Diluted earnings per share $ 0.66 $ 0.51

COMMITMENTS_

COMMITMENTS:	3 Months Ended
	Mar. 31, 2017
Disclosure Text Block Supplement [Abstract]
Commitments	COMMITMENTS Purchase Obligations IDACORP's and Idaho Power's purchase obligations did not change materially, outside of the ordinary course of business, during the three months ended March 31, 2017 , except that Idaho Power entered into an agreement with a biomass PURPA-qualifying facility which increased contractual payment obligations by approximately $25 million over the 20-year life of the contract. Guarantees Through a self-bonding mechanism, Idaho Power guarantees its portion of reclamation activities and obligations at BCC, of which IERCo owns a one-third interest. This guarantee, which is renewed annually with the Wyoming Department of Environmental Quality, was $71 million at March 31, 2017 , representing IERCo's one-third share of BCC's total reclamation obligation. BCC has a reclamation trust fund set aside specifically for the purpose of paying these reclamation costs. At March 31, 2017 , the current value of the reclamation trust fund was $85 million . During the three months ended March 31, 2017 , the reclamation trust fund made no distributions for reclamation activity costs associated with the BCC surface mine. BCC periodically assesses the adequacy of the reclamation trust fund and its estimate of future reclamation costs. To ensure that the reclamation trust fund maintains adequate reserves, BCC has the ability to add a per-ton surcharge to coal sales, all of which are made to the Jim Bridger plant. Starting in 2010, BCC began applying a nominal surcharge to coal sales in order to maintain adequate reserves in the reclamation trust fund. Because of the existence of the fund and the ability to apply a per-ton surcharge, the estimated fair value of this guarantee is minimal. IDACORP and Idaho Power enter into financial agreements and power purchase and sale agreements that include indemnification provisions relating to various forms of claims or liabilities that may arise from the transactions contemplated by these agreements. Generally, a maximum obligation is not explicitly stated in the indemnification provisions and, therefore, the overall maximum amount of the obligation under such indemnification provisions cannot be reasonably estimated. IDACORP and Idaho Power periodically evaluate the likelihood of incurring costs under such indemnities based on their historical experience and the evaluation of the specific indemnities. As of March 31, 2017 , management believes the likelihood is remote that IDACORP or Idaho Power would be required to perform under such indemnification provisions or otherwise incur any significant losses with respect to such indemnification obligations. Neither IDACORP nor Idaho Power has recorded any liability on their respective condensed consolidated balance sheets with respect to these indemnification obligations.

CONTINGENCIES_

CONTINGENCIES:	3 Months Ended
	Mar. 31, 2017
Loss Contingency [Abstract]
Contingencies	CONTINGENCIES IDACORP and Idaho Power have in the past and expect in the future to become involved in various claims, controversies, disputes, and other contingent matters, some of which involve litigation and regulatory or other contested proceedings. The ultimate resolution and outcome of litigation and regulatory proceedings is inherently difficult to determine, particularly where (a) the remedies or penalties sought are indeterminate, (b) the proceedings are in the early stages or the substantive issues have not been well developed, or (c) the matters involve complex or novel legal theories or a large number of parties. In accordance with applicable accounting guidance, IDACORP and Idaho Power, as applicable, establish an accrual for legal proceedings when those matters proceed to a stage where they present loss contingencies that are both probable and reasonably estimable. If the loss contingency at issue is not both probable and reasonably estimable, IDACORP and Idaho Power do not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable. As of the date of this report, IDACORP's and Idaho Power's accruals for loss contingencies are not material to their financial statements as a whole; however, future accruals could be material in a given period. IDACORP's and Idaho Power's determination is based on currently available information, and estimates presented in financial statements and other financial disclosures involve significant judgment and may be subject to significant uncertainty. For matters that affect Idaho Power’s operations, Idaho Power intends to seek, to the extent permissible and appropriate, recovery through the ratemaking process of costs incurred. IDACORP and Idaho Power are parties to legal claims and legal and regulatory actions and proceedings in the ordinary course of business and, as noted above, record an accrual for associated loss contingencies when they are probable and reasonably estimable. As of the date of this report, the companies believe that resolution of those matters will not have a material adverse effect on their respective consolidated financial statements. Idaho Power is also actively monitoring various pending environmental regulations and the recently issued executive orders related to environmental matters that may have a significant impact on its future operations. Given uncertainties regarding the outcome, timing, and compliance plans for these environmental matters, Idaho Power is unable to estimate the financial impact of these regulations.

BENEFIT PLANS_

BENEFIT PLANS:	3 Months Ended
	Mar. 31, 2017
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Benefit Plans	BENEFIT PLANS Idaho Power has a noncontributory defined benefit pension plan (pension plan) and two nonqualified defined benefit plans for certain senior management employees called the Security Plan for Senior Management Employees I and Security Plan for Senior Management Employees II (collectively, SMSP). Idaho Power also has a nonqualified defined benefit pension plan for directors that was frozen in 2002. Remaining vested benefits from that plan are included with the SMSP in the disclosures below. The benefits under the pension plan are based on years of service and the employee’s final average earnings. Idaho Power also maintains a defined benefit postretirement benefit plan (consisting of health care and death benefits) that covers all employees who were enrolled in the active-employee group plan at the time of retirement as well as their spouses and qualifying dependents. The following table shows the components of net periodic benefit costs for the pension, SMSP, and postretirement benefits plans for the three months ended March 31, 2017 and 2016 (in thousands). Pension Plan SMSP Postretirement 2017 2016 2017 2016 2017 2016 Service cost $ 8,626 $ 8,117 $ 190 $ 307 $ 289 $ 293 Interest cost 9,763 9,423 1,078 1,069 690 696 Expected return on plan assets (11,388 ) (10,170 ) — — (570 ) (620 ) Amortization of prior service cost 7 13 32 42 7 7 Amortization of net loss 3,383 3,384 741 883 — — Net periodic benefit cost 10,391 10,767 2,041 2,301 416 376 Regulatory deferral of net periodic benefit cost (1) (9,796 ) (10,307 ) — — — — Previously deferred pension costs recognized (1) 4,288 4,288 — — — — Net periodic benefit cost recognized for financial reporting (1) $ 4,883 $ 4,748 $ 2,041 $ 2,301 $ 416 $ 376 (1) Net periodic benefit costs for the pension plan are recognized for financial reporting based upon the authorization of each regulatory jurisdiction in which Idaho Power operates. Under IPUC order, the Idaho portion of net periodic benefit cost is recorded as a regulatory asset and is recognized in the income statement as those costs are recovered through rates. Idaho Power has no minimum contribution requirement to its defined benefit pension plan in 2017, and during the three months ended March 31, 2017, made no contributions. Idaho Power plans to contribute between $20 million and $40 million to its defined benefit pension plan during 2017 in a continued effort to balance the regulatory collection of these expenditures with the amount and timing of contributions and to mitigate the cost of being in an underfunded position. The primary impact of pension contributions is on the timing of cash flows, as the timing of cost recovery lags behind contributions. Idaho Power also has an Employee Savings Plan that complies with Section 401(k) of the Internal Revenue Code and covers substantially all employees. Idaho Power matches specified percentages of employee contributions to the Employee Savings Plan.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS:	3 Months Ended
	Mar. 31, 2017
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS Commodity Price Risk Idaho Power is exposed to market risk relating to electricity, natural gas, and other fuel commodity prices, all of which are heavily influenced by supply and demand. Market risk may be influenced by market participants’ nonperformance of their contractual obligations and commitments, which affects the supply of or demand for the commodity. Idaho Power uses derivative instruments, such as physical and financial forward contracts, for both electricity and fuel to manage the risks relating to these commodity price exposures. The primary objectives of Idaho Power’s energy purchase and sale activity are to meet the demand of retail electric customers, maintain appropriate physical reserves to ensure reliability, and make economic use of temporary surpluses that may develop. All of Idaho Power's derivative instruments have been entered into for the purpose of economically hedging forecasted purchases and sales, though none of these instruments have been designated as cash flow hedges. Idaho Power offsets fair value amounts recognized on its balance sheet and applies collateral related to derivative instruments executed with the same counterparty under the same master netting agreement. Idaho Power does not offset a counterparty's current derivative contracts with the counterparty's long-term derivative contracts, although Idaho Power's master netting arrangements would allow current and long-term positions to be offset in the event of default. Also, in the event of default, Idaho Power's master netting arrangements would allow for the offsetting of all transactions executed under the master netting arrangement. These types of transactions may include non-derivative instruments, derivatives qualifying for scope exceptions, receivables and payables arising from settled positions, and other forms of non-cash collateral (such as letters of credit). These types of transactions are excluded from the offsetting presented in the derivative fair value and offsetting table that follows. The table below presents the gains and losses on derivatives not designated as hedging instruments for the three months ended March 31, 2017 and 2016 (in thousands). Gain/(Loss) on Derivatives Recognized in Income (1) Location of Realized Gain/(Loss) on Derivatives Recognized in Income Three months ended 2017 2016 Financial swaps Off-system sales $ 1,478 $ 1,446 Financial swaps Purchased power (447 ) (13 ) Financial swaps Fuel expense 670 (2,815 ) Financial swaps Other operations and maintenance (26 ) (115 ) Forward contracts Purchased power (1 ) — Forward contracts Fuel expense — (4 ) (1) Excludes unrealized gains or losses on derivatives, which are recorded on the balance sheet as regulatory assets or regulatory liabilities. Settlement gains and losses on electricity swap contracts are recorded on the income statement in off-system sales or purchased power depending on the forecasted position being economically hedged by the derivative contract. Settlement gains and losses on contracts for natural gas are reflected in fuel expense. Settlement gains and losses on diesel derivatives are recorded in other operations and maintenance expense. See Note 11 for additional information concerning the determination of fair value for Idaho Power’s assets and liabilities from price risk management activities. Derivative Instrument Summary The table below presents the fair values and locations of derivative instruments not designated as hedging instruments recorded on the balance sheets and reconciles the gross amounts of derivatives recognized as assets and as liabilities to the net amounts presented in the balance sheets at March 31, 2017 , and December 31, 2016 (in thousands). Asset Derivatives Liability Derivatives Balance Sheet Location Gross Fair Value Amounts Offset Net Assets Gross Fair Value Amounts Offset Net Liabilities March 31, 2017 Current: Financial swaps Other current assets $ 2,411 $ (101 ) $ 2,310 $ 101 $ (101 ) $ — Financial swaps Other current liabilities 320 (320 ) — 662 (425 ) (1) 237 Forward contracts Other current assets 5 — 5 — — — Long-term: Financial swaps Other assets 7 — 7 — — — Financial swaps Other liabilities — — — 190 — 190 Total $ 2,743 $ (421 ) $ 2,322 $ 953 $ (526 ) $ 427 December 31, 2016 Current: Financial swaps Other current assets $ 8,134 $ (2,183 ) (2) $ 5,951 $ 302 $ (302 ) $ — Total $ 8,134 $ (2,183 ) $ 5,951 $ 302 $ (302 ) $ — (1) Current liability derivative amount offset includes $0.1 million of collateral receivable for the period ending March 31, 2017 . (2) Current asset derivative amount offset includes $1.9 million of collateral payable for the period ending December 31, 2016 . The table below presents the volumes of derivative commodity forward contracts and swaps outstanding at March 31, 2017 and 2016 (in thousands of units). March 31, Commodity Units 2017 2016 Electricity purchases MWh 128 500 Electricity sales MWh 173 18 Natural gas purchases MMBtu 8,130 13,723 Natural gas sales MMBtu — 150 Diesel purchases Gallons 885 802 Credit Risk At March 31, 2017 , Idaho Power did not have material credit risk exposure from financial instruments, including derivatives. Idaho Power monitors credit risk exposure through reviews of counterparty credit quality, corporate-wide counterparty credit exposure, and corporate-wide counterparty concentration levels. Idaho Power manages these risks by establishing credit and concentration limits on transactions with counterparties and requiring contractual guarantees, cash deposits, or letters of credit from counterparties or their affiliates, as deemed necessary. Idaho Power’s physical power contracts are commonly under Western Systems Power Pool agreements, physical gas contracts are usually under North American Energy Standards Board contracts, and financial transactions are usually under International Swaps and Derivatives Association, Inc. contracts. These contracts contain adequate assurance clauses requiring collateralization if a counterparty has debt that is downgraded below investment grade by at least one rating agency. Credit-Contingent Features Certain Idaho Power derivative instruments contain provisions that require Idaho Power's unsecured debt to maintain an investment grade credit rating from Moody's Investors Service and Standard & Poor's Ratings Services. If Idaho Power's unsecured debt were to fall below investment grade, it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position at March 31, 2017 , was $0.8 million . Idaho Power posted $0.1 million cash collateral related to this amount. If the credit-risk-related contingent features underlying these agreements were triggered on March 31, 2017 , Idaho Power would have been required to pay or post collateral to its counterparties up to an additional $1.3 million to cover the open liability positions as well as completed transactions that have not yet been paid.

FAIR VALUE MEASUREMENTS_

FAIR VALUE MEASUREMENTS:	3 Months Ended
	Mar. 31, 2017
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS IDACORP and Idaho Power have categorized their financial instruments into a three-level fair value hierarchy, based on the priority of the inputs to the valuation technique. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the financial instruments fall within different levels of the hierarchy, the categorization is based on the lowest level input that is significant to the fair value measurement of the instrument. Financial assets and liabilities recorded on the condensed consolidated balance sheets are categorized based on the inputs to the valuation techniques as follows: • Level 1: Financial assets and liabilities whose values are based on unadjusted quoted prices for identical assets or liabilities in an active market that IDACORP and Idaho Power have the ability to access. • Level 2: Financial assets and liabilities whose values are based on the following: a) quoted prices for similar assets or liabilities in active markets; b) quoted prices for identical or similar assets or liabilities in non-active markets; c) pricing models whose inputs are observable for substantially the full term of the asset or liability; and d) pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full term of the asset or liability. IDACORP and Idaho Power Level 2 inputs are based on quoted market prices adjusted for location using corroborated, observable market data. • Level 3: Financial assets and liabilities whose values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability. IDACORP’s and Idaho Power’s assessment of a particular input's significance to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy. An item recorded at fair value is reclassified among levels when changes in the nature of valuation inputs cause the item to no longer meet the criteria for the level in which it was previously categorized. There were no transfers between levels or material changes in valuation techniques or inputs during the three months ended March 31, 2017 . The table below presents information about IDACORP’s and Idaho Power’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 (in thousands). March 31, 2017 December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Money market funds IDACORP $ 700 $ — $ — $ 700 $ 15,000 $ — $ — $ 15,000 Idaho Power 40,050 — — 40,050 29,967 — — 29,967 Derivatives 2,317 5 — 2,322 5,951 — — 5,951 Trading securities: Equity securities 104 — — 104 111 — — 111 Available-for-sale securities: Equity securities 25,599 — — 25,599 23,908 — — 23,908 Liabilities: Derivatives 427 — — 427 — — — — Idaho Power’s derivatives are contracts entered into as part of its management of loads and resources. Electricity derivatives are valued on the Intercontinental Exchange (ICE) with quoted prices in an active market. Natural gas and diesel derivatives are valued using New York Mercantile Exchange (NYMEX) and ICE pricing, adjusted for location basis, which are also quoted under NYMEX and ICE pricing. Trading securities consist of employee-directed investments held in a Rabbi trust and are related to an executive deferred compensation plan. Available-for-sale securities are related to the SMSP, are held in a Rabbi trust, and are actively traded money market and exchange traded funds with quoted prices in active markets. The table below presents the carrying value and estimated fair value of financial instruments that are not reported at fair value, as of March 31, 2017 , and December 31, 2016 , using available market information and appropriate valuation methodologies (in thousands). March 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value IDACORP Assets: Notes receivable (1) $ 3,804 $ 3,804 $ 3,804 $ 3,804 Liabilities: Long-term debt (1) 1,744,991 1,867,331 1,745,678 1,858,666 Idaho Power Liabilities: Long-term debt (1) 1,744,991 1,867,331 1,745,678 1,858,666 (1) Notes receivable and long-term debt are categorized as Level 3 and Level 2, respectively, of the fair value hierarchy, as defined earlier in this Note 11. Notes receivable are related to Ida-West and are valued based on unobservable inputs, including discounted cash flows, which are partially based on forecasted hydroelectric conditions. Long-term debt is not traded on an exchange and is valued using quoted rates for similar debt in active markets. Carrying values for cash and cash equivalents, deposits, customer and other receivables, notes payable, accounts payable, interest accrued, and taxes accrued approximate fair value.

SEGMENT INFORMATION_

SEGMENT INFORMATION:	3 Months Ended
	Mar. 31, 2017
Segment Reporting, Measurement Disclosures [Abstract]
Segment Information	SEGMENT INFORMATION IDACORP’s only reportable segment is utility operations. The utility operations segment’s primary source of revenue is the regulated operations of Idaho Power. Idaho Power’s regulated operations include the generation, transmission, distribution, purchase, and sale of electricity. This segment also includes income from IERCo, a wholly-owned subsidiary of Idaho Power that is also subject to regulation and is a one-third owner of BCC, an unconsolidated joint venture. IDACORP’s other operating segments are below the quantitative and qualitative thresholds for reportable segments and are included in the "All Other" category in the table below. This category is comprised of IFS’s investments in affordable housing and historic rehabilitation projects, Ida-West’s joint venture investments in small hydroelectric generation projects, the remaining activities of IESCo, the successor to which wound down its energy marketing operations in 2003, and IDACORP’s holding company expenses. The table below summarizes the segment information for IDACORP’s utility operations and the total of all other segments, and reconciles this information to total enterprise amounts (in thousands). Utility Operations All Other Eliminations Consolidated Total Three months ended March 31, 2017: Revenues $ 301,964 $ 580 $ — $ 302,544 Net income attributable to IDACORP, Inc. 32,482 620 — 33,102 Total assets as of March 31, 2017 6,178,648 74,472 (23,172 ) 6,229,948 Three months ended March 31, 2016: Revenues $ 280,566 $ 390 $ — $ 280,956 Net income attributable to IDACORP, Inc. 25,534 195 — 25,729

CHANGES IN ACCUMULATED OTHER CO

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME: CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME:	3 Months Ended
	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income [Text Block]	CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME The table below presents changes in components of accumulated other comprehensive income (AOCI), net of tax, during the three months ended March 31, 2017 and 2016 (in thousands). Items in parentheses indicate charges to AOCI. Defined Benefit Pension Items Three months ended 2017 2016 Balance at beginning of period $ (20,882 ) $ (21,276 ) Amounts reclassified out of AOCI 471 564 Balance at end of period $ (20,411 ) $ (20,712 ) The table below presents amounts reclassified out of components of AOCI and the income statement location of those amounts reclassified during the three months ended March 31, 2017 and 2016 (in thousands). Items in parentheses indicate increases to net income. Amount Reclassified from AOCI Details About AOCI Three months ended 2017 2016 Amortization of defined benefit pension items (1) Prior service cost $ 32 $ 42 Net loss 741 883 Total before tax 773 925 Tax benefit (2) (302 ) (361 ) Net of tax 471 564 Total reclassification for the period $ 471 $ 564 (1) Amortization of these items is included in IDACORP's condensed consolidated income statements in other operating expenses and in Idaho Power's condensed consolidated income statements in other expense, net. (2) The tax benefit is included in income tax expense in the condensed consolidated income statements of both IDACORP and Idaho Power.

SUMMARY OF SIGNIFICANT ACCOUN23

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Organization, Consolidation, Presentation, and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Nature of Business	IDACORP is a holding company formed in 1998 whose principal operating subsidiary is Idaho Power. Idaho Power is an electric utility engaged in the generation, transmission, distribution, sale, and purchase of electric energy and capacity with a service area covering approximately 24,000 square miles in southern Idaho and eastern Oregon. Idaho Power is regulated primarily by the state utility regulatory commissions of Idaho and Oregon and the Federal Energy Regulatory Commission (FERC). Idaho Power is the parent of Idaho Energy Resources Co. (IERCo), a joint venturer in Bridger Coal Company (BCC), which mines and supplies coal to the Jim Bridger generating plant owned in part by Idaho Power. IDACORP’s other wholly-owned subsidiaries include IDACORP Financial Services, Inc. (IFS), an investor in affordable housing and other real estate investments; Ida-West Energy Company (Ida-West), an operator of small hydroelectric generation projects that satisfy the requirements of the Public Utility Regulatory Policies Act of 1978 (PURPA); and IDACORP Energy Services Co. (IESCo), which is the former limited partner of, and current successor by merger to, IDACORP Energy L.P., a marketer of energy commodities that wound down operations in 2003.
Regulation of Utility Operations	As a regulated utility, many of Idaho Power's fundamental business decisions are subject to the approval of governmental agencies, including the prices that Idaho Power is authorized to charge for its electric service. These approvals are a critical factor in determining IDACORP's and Idaho Power's results of operations and financial condition. IDACORP's and Idaho Power's financial statements reflect the effects of the different ratemaking principles followed by the jurisdictions regulating Idaho Power. The application of accounting principles related to regulated operations sometimes results in Idaho Power recording expenses and revenues in a different period than when an unregulated enterprise would record such expenses and revenues. In these instances, the amounts are deferred or accrued as regulatory assets or regulatory liabilities on the balance sheet and recorded on the income statement when recovered or returned through rates. Additionally, regulators can impose regulatory liabilities upon a regulated company for amounts previously collected from customers that are expected to be refunded. The effects of applying these regulatory accounting principles to Idaho Power's operations are discussed in more detail in Note 3.
Financial Statements	In the opinion of management of IDACORP and Idaho Power, the accompanying unaudited condensed consolidated financial statements contain all adjustments necessary to present fairly each company's consolidated financial position as of March 31, 2017 , consolidated results of operations for the three months ended March 31, 2017 and 2016 , and consolidated cash flows for the three months ended March 31, 2017 and 2016 . These adjustments are of a normal and recurring nature. These financial statements do not contain the complete detail or footnote disclosure concerning accounting policies and other matters that would be included in full-year financial statements and should be read in conjunction with the audited consolidated financial statements included in IDACORP’s and Idaho Power’s Annual Report on Form 10-K for the year ended December 31, 2016 . The results of operations for the interim period are not necessarily indicative of the results to be expected for the full year. A change in management's estimates or assumptions could have a material impact on IDACORP's or Idaho Power's respective financial condition and results of operations during the period in which such change occurred.
Management Estimates	Management makes estimates and assumptions when preparing financial statements in conformity with generally accepted accounting principles. These estimates and assumptions include those related to rate regulation, retirement benefits, contingencies, litigation, asset impairment, income taxes, unbilled revenues, and bad debt. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates involve judgments with respect to, among other things, future economic factors that are difficult to predict and are beyond management's control. Accordingly, actual results could differ from those estimates.
Reclassification	In these consolidated financial statements, certain immaterial amounts in prior periods' consolidated financial statements and footnotes have been reclassified to conform with the current period presentation.
Income Tax	In accordance with interim reporting requirements, IDACORP and Idaho Power use an estimated annual effective tax rate for computing their provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual effective tax rate is applied to year-to-date pretax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period's year-to-date amount.
Fair Value of Financial Instruments	IDACORP and Idaho Power have categorized their financial instruments into a three-level fair value hierarchy, based on the priority of the inputs to the valuation technique. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). If the inputs used to measure the financial instruments fall within different levels of the hierarchy, the categorization is based on the lowest level input that is significant to the fair value measurement of the instrument. Financial assets and liabilities recorded on the condensed consolidated balance sheets are categorized based on the inputs to the valuation techniques as follows: • Level 1: Financial assets and liabilities whose values are based on unadjusted quoted prices for identical assets or liabilities in an active market that IDACORP and Idaho Power have the ability to access. • Level 2: Financial assets and liabilities whose values are based on the following: a) quoted prices for similar assets or liabilities in active markets; b) quoted prices for identical or similar assets or liabilities in non-active markets; c) pricing models whose inputs are observable for substantially the full term of the asset or liability; and d) pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full term of the asset or liability. IDACORP and Idaho Power Level 2 inputs are based on quoted market prices adjusted for location using corroborated, observable market data. • Level 3: Financial assets and liabilities whose values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability. IDACORP’s and Idaho Power’s assessment of a particular input's significance to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy. An item recorded at fair value is reclassified among levels when changes in the nature of valuation inputs cause the item to no longer meet the criteria for the level in which it was previously categorized.
New Accounting Pronouncements	Recent Accounting Pronouncements Not Yet Adopted In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 is intended to enable users of financial statements to better understand and consistently analyze an entity's revenue across industries, transactions, and geographies. Under the ASU, recognition of revenue occurs when a customer obtains control of promised goods or services. In addition, the ASU requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The FASB amended certain aspects of ASU 2014-09 to clarify the implementation guidance, including clarifications related to principal versus agent considerations, licensing and identifying performance obligations, narrow scope improvements, and practical expedients. While the companies continue to assess the impacts of ASU 2014-09 on their financial statements, including disclosure requirements, the companies do not expect the new guidance to significantly affect revenue recognition for tariff-based sales, which represent a significant majority of the companies' general business revenue. Accordingly, the companies do not expect the adoption of ASU 2014-09 to have a material effect on their financial statements. However, a number of industry-specific implementation issues are still unresolved and could affect the companies' accounting for contributions in aid of construction, sales of renewable energy credits, alternative revenue programs, and recognition of revenue when collectability is in question. The guidance in ASU 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017. The guidance permits two implementation approaches, one requiring retrospective application of the new standard with restatement of prior years (full retrospective approach) and the other requiring prospective application of the new standard including a cumulative-effect adjustment with disclosure of results under previous standards (modified-retrospective approach). IDACORP and Idaho Power plan to adopt ASU 2014-09 on January 1, 2018, using the modified-retrospective approach. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), intended to improve financial reporting on leasing transactions. The ASU significantly changes the accounting model used by lessees to account for leases, requiring that all material leases be presented on the balance sheet. Under the current model, some leases are classified as capital leases and recorded on the balance sheet while other leases classified as operating leases are not recognized on the balance sheet. The new standard is effective for interim and annual reporting periods beginning after December 15, 2018, with early adoption permitted. The standard must be adopted using a modified retrospective approach. IDACORP and Idaho Power are evaluating the impact of ASU 2016-02 on their financial statements. At this time, the companies do not know, and cannot reasonably estimate, the dollar impact of the adoption. Specifically, the companies are considering whether the new guidance will affect their accounting for purchase power agreements, easements and rights-of-way, utility pole attachments, and other utility industry-related areas. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) , which amends ASC 230 to clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The FASB issued the ASU with the intent of reducing diversity in practice with respect to eight types of cash flows. The companies expect the ASU to affect the classification of proceeds from the settlement of corporate-owned life insurance policies and related costs, which will be classified as investing activities under the new guidance. The companies already present debt prepayment and extinguishment costs, proceeds from the settlement of insurance claims (other than corporate-owned life insurance), and distributions received from equity-method investments in accordance with the new guidance. ASU 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. The standard must be adopted retrospectively to all periods presented, unless impracticable to do so. IDACORP and Idaho Power do not believe the adoption will have a material impact on their financial statements. In March 2017, the FASB issued ASU 2017-07, Compensation -- Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires employers to disaggregate the service cost component from other components of net periodic benefit costs and to disclose the amounts of net periodic benefit costs that are included in each income statement line item. The standard requires employers to present the service cost component in the same line item as other compensation costs and to present the other components of net periodic benefit costs (which include interest costs, expected return on plan assets, amortization of prior service cost or credits and actuarial gains and losses) separately and outside a subtotal of operating income. In addition, only the service cost component is eligible for capitalization. The amendments in ASU 2017-07 are effective for interim and annual reporting periods beginning after December 15, 2017. Entities must use (1) a retrospective transition method to adopt the requirement for separate presentation in the income statement of service costs and other components and (2) a prospective transition method to adopt the requirement to limit the capitalization of benefit costs to the service cost component. IDACORP and Idaho Power are evaluating the impact of ASU 2017-07 on their financial statements.
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block]	Idaho Power is exposed to market risk relating to electricity, natural gas, and other fuel commodity prices, all of which are heavily influenced by supply and demand. Market risk may be influenced by market participants’ nonperformance of their contractual obligations and commitments, which affects the supply of or demand for the commodity. Idaho Power uses derivative instruments, such as physical and financial forward contracts, for both electricity and fuel to manage the risks relating to these commodity price exposures. The primary objectives of Idaho Power’s energy purchase and sale activity are to meet the demand of retail electric customers, maintain appropriate physical reserves to ensure reliability, and make economic use of temporary surpluses that may develop. All of Idaho Power's derivative instruments have been entered into for the purpose of economically hedging forecasted purchases and sales, though none of these instruments have been designated as cash flow hedges. Idaho Power offsets fair value amounts recognized on its balance sheet and applies collateral related to derivative instruments executed with the same counterparty under the same master netting agreement. Idaho Power does not offset a counterparty's current derivative contracts with the counterparty's long-term derivative contracts, although Idaho Power's master netting arrangements would allow current and long-term positions to be offset in the event of default. Also, in the event of default, Idaho Power's master netting arrangements would allow for the offsetting of all transactions executed under the master netting arrangement. These types of transactions may include non-derivative instruments, derivatives qualifying for scope exceptions, receivables and payables arising from settled positions, and other forms of non-cash collateral (such as letters of credit). These types of transactions are excluded from the offsetting presented in the derivative fair value and offsetting table that follows.
Derivatives, Reporting of Derivative Activity	Settlement gains and losses on electricity swap contracts are recorded on the income statement in off-system sales or purchased power depending on the forecasted position being economically hedged by the derivative contract. Settlement gains and losses on contracts for natural gas are reflected in fuel expense. Settlement gains and losses on diesel derivatives are recorded in other operations and maintenance expense.
Segment Reporting	IDACORP’s only reportable segment is utility operations. The utility operations segment’s primary source of revenue is the regulated operations of Idaho Power. Idaho Power’s regulated operations include the generation, transmission, distribution, purchase, and sale of electricity. This segment also includes income from IERCo, a wholly-owned subsidiary of Idaho Power that is also subject to regulation and is a one-third owner of BCC, an unconsolidated joint venture. IDACORP’s other operating segments are below the quantitative and qualitative thresholds for reportable segments and are included in the "All Other" category in the table below. This category is comprised of IFS’s investments in affordable housing and historic rehabilitation projects, Ida-West’s joint venture investments in small hydroelectric generation projects, the remaining activities of IESCo, the successor to which wound down its energy marketing operations in 2003, and IDACORP’s holding company expenses.

INCOME TAXES_ Level 3 (Tables)

INCOME TAXES: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The following table provides a summary of income tax expense for the three months ended March 31 (in thousands): IDACORP Idaho Power 2017 2016 2017 2016 Income tax at statutory rates (federal and state) $ 15,360 $ 11,768 $ 15,192 $ 11,809 Additional ADITC amortization (1,875 ) (500 ) (1,875 ) (500 ) Share-based compensation (1,559 ) (1,622 ) (1,530 ) (1,587 ) Other (1) (5,743 ) (5,279 ) (5,414 ) (5,054 ) Income tax expense $ 6,183 $ 4,367 $ 6,373 $ 4,668 Effective tax rate 15.7 % 14.6 % 16.4 % 15.5 % (1) "Other" is primarily comprised of the net tax effect of Idaho Power's regulatory flow-through tax adjustments. These adjustments, which include the capitalized repairs deduction, are each listed in the rate reconciliation table in Note 2 to the consolidated financial statements included in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2016.

NOTES PAYABLE_ Level 3 (Tables)

NOTES PAYABLE: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Shedule of short term debt [Abstract]
Schedule of Short-term Debt	Balances (in thousands) and interest rates of IDACORP’s and Idaho Power's short-term borrowings were as follows at March 31, 2017 and December 31, 2016 : March 31, 2017 December 31, 2016 IDACORP Idaho Power Total IDACORP Idaho Power Total Commercial paper outstanding $ — $ — $ — $ — $ 21,800 $ 21,800 Weighted-average annual interest rate — % — % — % — % 1.13 % 1.13 %

EARNINGS PER SHARE_ Level 3 (Ta

EARNINGS PER SHARE: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block]	The table below presents the computation of IDACORP’s basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 (in thousands, except for per share amounts). Three months ended 2017 2016 Numerator: Net income attributable to IDACORP, Inc. $ 33,102 $ 25,729 Denominator: Weighted-average common shares outstanding - basic 50,356 50,299 Effect of dilutive securities 41 38 Weighted-average common shares outstanding - diluted 50,397 50,337 Basic earnings per share $ 0.66 $ 0.51 Diluted earnings per share $ 0.66 $ 0.51

BENEFIT PLANS_ Level 3 (Tables)

BENEFIT PLANS: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table Text Block]	The following table shows the components of net periodic benefit costs for the pension, SMSP, and postretirement benefits plans for the three months ended March 31, 2017 and 2016 (in thousands). Pension Plan SMSP Postretirement 2017 2016 2017 2016 2017 2016 Service cost $ 8,626 $ 8,117 $ 190 $ 307 $ 289 $ 293 Interest cost 9,763 9,423 1,078 1,069 690 696 Expected return on plan assets (11,388 ) (10,170 ) — — (570 ) (620 ) Amortization of prior service cost 7 13 32 42 7 7 Amortization of net loss 3,383 3,384 741 883 — — Net periodic benefit cost 10,391 10,767 2,041 2,301 416 376 Regulatory deferral of net periodic benefit cost (1) (9,796 ) (10,307 ) — — — — Previously deferred pension costs recognized (1) 4,288 4,288 — — — — Net periodic benefit cost recognized for financial reporting (1) $ 4,883 $ 4,748 $ 2,041 $ 2,301 $ 416 $ 376 (1) Net periodic benefit costs for the pension plan are recognized for financial reporting based upon the authorization of each regulatory jurisdiction in which Idaho Power operates. Under IPUC order, the Idaho portion of net periodic benefit cost is recorded as a regulatory asset and is recognized in the income statement as those costs are recovered through rates.

DERIVATIVE FINANCIAL INSTRUME28

DERIVATIVE FINANCIAL INSTRUMENTS: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Summary of Derivative Instruments [Abstract]
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The table below presents the gains and losses on derivatives not designated as hedging instruments for the three months ended March 31, 2017 and 2016 (in thousands). Gain/(Loss) on Derivatives Recognized in Income (1) Location of Realized Gain/(Loss) on Derivatives Recognized in Income Three months ended 2017 2016 Financial swaps Off-system sales $ 1,478 $ 1,446 Financial swaps Purchased power (447 ) (13 ) Financial swaps Fuel expense 670 (2,815 ) Financial swaps Other operations and maintenance (26 ) (115 ) Forward contracts Purchased power (1 ) — Forward contracts Fuel expense — (4 ) (1) Excludes unrealized gains or losses on derivatives, which are recorded on the balance sheet as regulatory assets or regulatory liabilities.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The table below presents the fair values and locations of derivative instruments not designated as hedging instruments recorded on the balance sheets and reconciles the gross amounts of derivatives recognized as assets and as liabilities to the net amounts presented in the balance sheets at March 31, 2017 , and December 31, 2016 (in thousands). Asset Derivatives Liability Derivatives Balance Sheet Location Gross Fair Value Amounts Offset Net Assets Gross Fair Value Amounts Offset Net Liabilities March 31, 2017 Current: Financial swaps Other current assets $ 2,411 $ (101 ) $ 2,310 $ 101 $ (101 ) $ — Financial swaps Other current liabilities 320 (320 ) — 662 (425 ) (1) 237 Forward contracts Other current assets 5 — 5 — — — Long-term: Financial swaps Other assets 7 — 7 — — — Financial swaps Other liabilities — — — 190 — 190 Total $ 2,743 $ (421 ) $ 2,322 $ 953 $ (526 ) $ 427 December 31, 2016 Current: Financial swaps Other current assets $ 8,134 $ (2,183 ) (2) $ 5,951 $ 302 $ (302 ) $ — Total $ 8,134 $ (2,183 ) $ 5,951 $ 302 $ (302 ) $ — (1) Current liability derivative amount offset includes $0.1 million of collateral receivable for the period ending March 31, 2017 . (2) Current asset derivative amount offset includes $1.9 million of collateral payable for the period ending December 31, 2016 .
Schedule of Derivative Instruments [Table Text Block]	The table below presents the volumes of derivative commodity forward contracts and swaps outstanding at March 31, 2017 and 2016 (in thousands of units). March 31, Commodity Units 2017 2016 Electricity purchases MWh 128 500 Electricity sales MWh 173 18 Natural gas purchases MMBtu 8,130 13,723 Natural gas sales MMBtu — 150 Diesel purchases Gallons 885 802

FAIR VALUE MEASUREMENTS_ Level

FAIR VALUE MEASUREMENTS: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The table below presents information about IDACORP’s and Idaho Power’s assets and liabilities measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 (in thousands). March 31, 2017 December 31, 2016 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Money market funds IDACORP $ 700 $ — $ — $ 700 $ 15,000 $ — $ — $ 15,000 Idaho Power 40,050 — — 40,050 29,967 — — 29,967 Derivatives 2,317 5 — 2,322 5,951 — — 5,951 Trading securities: Equity securities 104 — — 104 111 — — 111 Available-for-sale securities: Equity securities 25,599 — — 25,599 23,908 — — 23,908 Liabilities: Derivatives 427 — — 427 — — — —
Fair Value, by Balance Sheet Grouping [Table Text Block]	The table below presents the carrying value and estimated fair value of financial instruments that are not reported at fair value, as of March 31, 2017 , and December 31, 2016 , using available market information and appropriate valuation methodologies (in thousands). March 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value IDACORP Assets: Notes receivable (1) $ 3,804 $ 3,804 $ 3,804 $ 3,804 Liabilities: Long-term debt (1) 1,744,991 1,867,331 1,745,678 1,858,666 Idaho Power Liabilities: Long-term debt (1) 1,744,991 1,867,331 1,745,678 1,858,666 (1) Notes receivable and long-term debt are categorized as Level 3 and Level 2, respectively, of the fair value hierarchy, as defined earlier in this Note 11.

SEGMENT INFORMATION_ Level 3 (T

SEGMENT INFORMATION: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Information [Abstract]
Schedule of Segment Reporting Information, by Segment	The table below summarizes the segment information for IDACORP’s utility operations and the total of all other segments, and reconciles this information to total enterprise amounts (in thousands). Utility Operations All Other Eliminations Consolidated Total Three months ended March 31, 2017: Revenues $ 301,964 $ 580 $ — $ 302,544 Net income attributable to IDACORP, Inc. 32,482 620 — 33,102 Total assets as of March 31, 2017 6,178,648 74,472 (23,172 ) 6,229,948 Three months ended March 31, 2016: Revenues $ 280,566 $ 390 $ — $ 280,956 Net income attributable to IDACORP, Inc. 25,534 195 — 25,729

CHANGES IN ACCUMULATED OTHER 31

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME: Level 3 (Tables)	3 Months Ended
	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The table below presents changes in components of accumulated other comprehensive income (AOCI), net of tax, during the three months ended March 31, 2017 and 2016 (in thousands). Items in parentheses indicate charges to AOCI. Defined Benefit Pension Items Three months ended 2017 2016 Balance at beginning of period $ (20,882 ) $ (21,276 ) Amounts reclassified out of AOCI 471 564 Balance at end of period $ (20,411 ) $ (20,712 )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	The table below presents amounts reclassified out of components of AOCI and the income statement location of those amounts reclassified during the three months ended March 31, 2017 and 2016 (in thousands). Items in parentheses indicate increases to net income. Amount Reclassified from AOCI Details About AOCI Three months ended 2017 2016 Amortization of defined benefit pension items (1) Prior service cost $ 32 $ 42 Net loss 741 883 Total before tax 773 925 Tax benefit (2) (302 ) (361 ) Net of tax 471 564 Total reclassification for the period $ 471 $ 564 (1) Amortization of these items is included in IDACORP's condensed consolidated income statements in other operating expenses and in Idaho Power's condensed consolidated income statements in other expense, net. (2) The tax benefit is included in income tax expense in the condensed consolidated income statements of both IDACORP and Idaho Power.

SUMMARY OF SIGNIFICANT ACCOUN32

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: Accounting Adoption Pronouncement (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0	$ (234)

INCOME TAXES_ Level 4 (Details)

INCOME TAXES: Level 4 (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense [Line Items]
Income tax at statutory rates (federal and state)		$ 15,360	$ 11,768
Additional ADITC amortization		(1,875)	(500)
Share-based compensation		(1,559)	(1,622)
Other	[1]	(5,743)	(5,279)
Income Tax Expense		$ 6,183	$ 4,367
Effective tax rate		15.70%	14.60%
Idaho Power Company
Income Tax Expense [Line Items]
Income tax at statutory rates (federal and state)		$ 15,192	$ 11,809
Additional ADITC amortization		(1,875)	(500)
Share-based compensation		(1,530)	(1,587)
Other	[1]	(5,414)	(5,054)
Income Tax Expense		$ 6,373	$ 4,668
Effective tax rate		16.40%	15.50%
[1]	"Other" is primarily comprised of the net tax effect of Idaho Power's regulatory flow-through tax adjustments. These adjustments, which include the capitalized repairs deduction, are each listed in the rate reconciliation table in Note 2 to the consolidated financial statements included in IDACORP's and Idaho Power's Annual Report on Form 10-K for the year ended December 31, 2016.

REGULATORY MATTERS_ Level 4 (De

REGULATORY MATTERS: Level 4 (Details) - USD ($) $ in Thousands

May 03, 2017

Jun. 01, 2014

Oct. 01, 2012

Jul. 01, 2012

Mar. 01, 2012

Jan. 01, 2012

Mar. 31, 2017

Mar. 31, 2016

May 31, 2018

May 31, 2017

Jun. 01, 2017

Dec. 31, 2016

Jun. 01, 2016

Jun. 01, 2015

Oct. 30, 2014

Rate Case

Additional ADITC amortization

$ 1,875

$ 500

Idaho Power Company

Rate Case

Additional ADITC amortization

1,875

500

Idaho and Oregon General Rate Cases and Base Rate Adjustments | IDAHO

Rate Case

Authorized Rate of Return in Rate Case

7.86%

Total Retail Rate Base

$ 2,360,000

Approved Rate Increase (Decrease), Amount

$ 34,000

Idaho and Oregon General Rate Cases and Base Rate Adjustments | OREGON

Rate Case

Authorized Rate of Return in Rate Case

7.757%

Approved Rate Increase (Decrease), Amount

$ 1,800

Public Utilities, Approved Return on Equity, Percentage

9.90%

Cost Recovery for Langley Gulch Power Plant | IDAHO

Rate Case

Approved Rate Increase (Decrease), Amount

$ 58,100

Increase (Decrease) in Rate Base

$ 335,900

Cost Recovery for Langley Gulch Power Plant | OREGON

Rate Case

Approved Rate Increase (Decrease), Amount

$ 3,000

Idaho Settlement Stipulation - Investment Tax Credits and Sharing Mechanism

Rate Case

Authorized Return on Equity in Rate Case, Minimum

9.50%

Authorized Return on Equity in Rate Case, Mid-point

10.00%

Authorized Return on Equity in Rate Case, Maximum

10.50%

Investment Tax Credits Maximum In One Year In Rate Case

$ 25,000

Investment Tax Credits, Maximum, in Rate Case

$ 45,000

Additional ADITC amortization

$ 1,900

$ 500

Percentage to be Shared with Customers

75.00%

Percentage to be Shared with Entity

25.00%

Percent To Be Shared With Customers, Power Cost Adjustment

50.00%

Percent To Be Shared With Customers, Pension Balancing

25.00%

Regulatory Liabilities

$ 3,200

Annual Power Cost Adjustment Mechanism Filing [Member]

Rate Case

Approved Rate Increase (Decrease), Amount

$ 106,000

Regulatory Liabilities

$ 4,000

Annual Power Cost Adjustment Mechanism Filing [Member] | IDAHO

Rate Case

Approved Rate Increase (Decrease), Amount

$ 99,000

Idaho Fixed Cost Adjustment Mechanism Annual Filing

Rate Case

Annual fixed cost adjustment mechanism deferral

$ 28,100

$ 16,900

Scenario, Forecast [Member] | Base rate adjustment request for potential Valmy closure [Member] [Member]

Rate Case

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 13,300

Scenario, Forecast [Member] | Annual Power Cost Adjustment Mechanism Filing [Member]

Rate Case

Approved Rate Increase (Decrease), Amount

$ 17,300

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 10,600

Regulatory Liabilities

$ 13,000

Scenario, Forecast [Member] | Idaho Fixed Cost Adjustment Mechanism Annual Filing

Rate Case

Approved Rate Increase (Decrease), Amount

$ 11,200

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 6,900

Annual fixed cost adjustment mechanism deferral

$ 35,000

NOTES PAYABLE_ Level 4 (Details

NOTES PAYABLE: Level 4 (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Short-term borrowings:
Commercial paper outstanding	$ 0	$ 21,800
Weighted-average annual interest rate	0.00%	1.13%
Idaho Power Company
Credit facility:
Regulatory authority to incur short-term indebtedness	$ 450,000

COMMON STOCK_ Level 4 (Details)

COMMON STOCK: Level 4 (Details) $ in Billions	3 Months Ended
	Mar. 31, 2017USD ($)shares
Shareholders' equity
Restricted Stock Unit Awards to Employees	72,397
Restricted stock awards to directors	12,050
IDACORP
Shareholders' equity
Stock Issued During Period, Shares, New Issues	0
Maximum leverage ratio requirement	0.65
Ratio of Indebtedness to Net Capital	0.45
Dividend Distribution Restriction Amount | $	$ 1.2
Idaho Power Company
Shareholders' equity
Maximum leverage ratio requirement	0.65
Ratio of Indebtedness to Net Capital	0.47
Dividend Distribution Restriction Amount | $	$ 1.1
Dividend Distribution Restriction Threshold	0.35
Ratio of total Capital to total capital and long-term debt	0.54
Preferred Stock, Shares Outstanding	0

EARNINGS PER SHARE_ Level 4 (De

EARNINGS PER SHARE: Level 4 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net Income Attributable to IDACORP, Inc.	$ 33,102	$ 25,729
Denominator:
Weighted Average Common Shares Outstanding - Basic	50,356	50,299
Effect of dilutive securities	41	38
Weighted Average Common Shares Outstanding - Diluted	50,397	50,337
Earnings Attributable to IDACORP, Inc. - Basic (in dollars per share)	$ 0.66	$ 0.51
Earnings Attributable to IDACORP, Inc. - Diluted (in dollars per share)	$ 0.66	$ 0.51

COMMITMENTS_ Level 4 (Details)

COMMITMENTS: Level 4 (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Idaho Power Company
Guarantor Obligations
IERCo ownership interest in BCC	33.00%
IERCo guarantee of BCC reclamation obligation	$ 71
Long-term Purchase Commitment
Increase of Long-term Purchase Obligations, Amount	$ 25
Life of Contract	20 years
Bridger Coal Company
Guarantor Obligations
Guarantor Obligations Total Reclamation Trust Fund	$ 85
Distribution from Reclamation Trust Fund	$ 0

BENEFIT PLANS_ Level 4 (Details

BENEFIT PLANS: Level 4 (Details) - USD ($)		3 Months Ended		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017
Pension Plan
Defined Benefit Plan Disclosure
Service cost		$ 8,626,000	$ 8,117,000
Interest cost		9,763,000	9,423,000
Expected return on plan assets		(11,388,000)	(10,170,000)
Amortization of prior service cost		7,000	13,000
Amortization of net loss		3,383,000	3,384,000
Net periodic benefit cost		10,391,000	10,767,000
Regulatory deferral of net periodic benefit cost	[1]	(9,796,000)	(10,307,000)
IPUC Authorized recovered pension cost	[1]	4,288,000	4,288,000
Net periodic benefit cost recognized for financial reporting	[1]	4,883,000	4,748,000
Contributions made to the defined benefit pension plan		0
Senior Management Security Plan
Defined Benefit Plan Disclosure
Service cost		190,000	307,000
Interest cost		1,078,000	1,069,000
Expected return on plan assets		0	0
Amortization of prior service cost		32,000	42,000
Amortization of net loss		741,000	883,000
Net periodic benefit cost		2,041,000	2,301,000
Net periodic benefit cost recognized for financial reporting		2,041,000	2,301,000
Postretirement Benefits
Defined Benefit Plan Disclosure
Service cost		289,000	293,000
Interest cost		690,000	696,000
Expected return on plan assets		(570,000)	(620,000)
Amortization of prior service cost		7,000	7,000
Amortization of net loss		0	0
Net periodic benefit cost		416,000	376,000
Net periodic benefit cost recognized for financial reporting		$ 416,000	$ 376,000
Minimum [Member] | Scenario, Forecast [Member] | Pension Plan
Defined Benefit Plan Disclosure
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year				$ 20,000,000
Maximum [Member] | Scenario, Forecast [Member] | Pension Plan
Defined Benefit Plan Disclosure
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year				$ 40,000,000
[1]	Net periodic benefit costs for the pension plan are recognized for financial reporting based upon the authorization of each regulatory jurisdiction in which Idaho Power operates. Under IPUC order, the Idaho portion of net periodic benefit cost is recorded as a regulatory asset and is recognized in the income statement as those costs are recovered through rates.

Derivative Instruments Fair Val

Derivative Instruments Fair Value and Offsets Table (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	[1]	$ 100
Derivative Asset, Collateral, Obligation to Return Cash, Offset	[1]		$ 1,900
Derivative Asset, Fair Value, Gross Asset		2,743	8,134
Derivative Asset, Fair Value, Gross Liability		(421)	(2,183)
Derivative Asset, Fair Value, Amount Offset Against Collateral		2,322	5,951
Derivative Liability, Fair Value, Gross Liability		953	302
Derivative Liability, Fair Value, Gross Asset		(526)	(302)
Derivative Liability, Fair Value, Amount Offset Against Collateral		427	0
Financial Swaps | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,411	8,134
Derivative Asset, Fair Value, Gross Liability		(101)	(2,183)	[2]
Derivative Asset, Fair Value, Amount Offset Against Collateral		2,310	5,951
Derivative Liability, Fair Value, Gross Liability		101	302
Derivative Liability, Fair Value, Gross Asset		(101)	(302)
Derivative Liability, Fair Value, Amount Offset Against Collateral		0	$ 0
Financial Swaps | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		320
Derivative Asset, Fair Value, Gross Liability		(320)
Derivative Asset, Fair Value, Amount Offset Against Collateral		0
Derivative Liability, Fair Value, Gross Liability		662
Derivative Liability, Fair Value, Gross Asset	[3]	(425)
Derivative Liability, Fair Value, Amount Offset Against Collateral		237
Financial Swaps | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		7
Derivative Asset, Fair Value, Gross Liability		0
Derivative Asset, Fair Value, Amount Offset Against Collateral		7
Financial Swaps | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		190
Derivative Liability, Fair Value, Gross Asset		0
Derivative Liability, Fair Value, Amount Offset Against Collateral		190
Forward contracts | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5
Derivative Asset, Fair Value, Gross Liability		0
Derivative Asset, Fair Value, Amount Offset Against Collateral		$ 5
[1]	Excludes unrealized gains or losses on derivatives, which are recorded on the balance sheet as regulatory assets or regulatory liabilities.
[2]	Current asset derivative amount offset includes $1.9 million of collateral payable for the period ending December 31, 2016.
[3]	Current liability derivative amount offset includes $0.1 million of collateral receivable for the period ending March 31, 2017.

Derivative Instruments Gains (L

Derivative Instruments Gains (Loss) on Derivatives Recognized in Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Financial Swaps | Off-system sales
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative	[1]	$ 1,478	$ 1,446
Financial Swaps | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	[1]	(447)	(13)
Financial Swaps | Fuel expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	[1]		(2,815)
Derivative, Gain on Derivative	[1]	670
Financial Swaps | Other operations and maintenance
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	[1]	(26)	(115)
Forward contracts | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	[1]	(1)
Derivative, Gain on Derivative	[1]		0
Forward contracts | Fuel expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	[1]		$ (4)
Derivative, Gain on Derivative	[1]	$ 0
[1]	Excludes unrealized gains or losses on derivatives, which are recorded on the balance sheet as regulatory assets or regulatory liabilities.

Derivative Commodities and Disc

Derivative Commodities and Disclosures (Details) MWh in Thousands, MMBTU in Thousands, Gallon in Thousands, $ in Millions	Mar. 31, 2017USD ($)MWhGallonMMBTU	Mar. 31, 2016MWhGallonMMBTU
Derivative
Derivatives in a net liability position	$ 0.8
Collateral Already Posted, Aggregate Fair Value	0.1
Additional Collateral, Aggregate Fair Value	$ 1.3
Electricity (MWh) | Long [Member]
Derivative
Derivative, Nonmonetary Notional Amount | MWh	128	500
Electricity (MWh) | Short [Member]
Derivative
Derivative, Nonmonetary Notional Amount | MWh	173	18
Natural Gas (MMBTU) | Long [Member]
Derivative
Derivative, Nonmonetary Notional Amount | MMBTU	8,130	13,723
Natural Gas (MMBTU) | Short [Member]
Derivative
Derivative, Nonmonetary Notional Amount | MMBTU	0	150
Diesel Fuel (Gallons) | Long [Member]
Derivative
Derivative, Nonmonetary Notional Amount | Gallon	885	802

FAIR VALUE MEASUREMENTS_ Leve43

FAIR VALUE MEASUREMENTS: Level 4 (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0	$ 0
Derivative Assets	2,322,000	5,951,000
Money market funds	700,000	15,000,000
Trading Securities	104,000	111,000
Available-for-sale Securities: Equity securities	25,599,000	23,908,000
Derivative Liabilities	427,000	0
Idaho Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	40,050,000	29,967,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	2,317,000	5,951,000
Money market funds	700,000	15,000,000
Trading Securities	104,000	111,000
Available-for-sale Securities: Equity securities	25,599,000	23,908,000
Derivative Liabilities	427,000	0
Fair Value, Inputs, Level 1 [Member] | Idaho Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	40,050,000	29,967,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	5,000	0
Money market funds	0	0
Trading Securities	0	0
Available-for-sale Securities: Equity securities	0	0
Derivative Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Idaho Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0	0
Money market funds	0	0
Trading Securities	0	0
Available-for-sale Securities: Equity securities	0	0
Derivative Liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Idaho Power Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 0	$ 0

FAIR VALUE MEASUREMENTS_ Fair V

FAIR VALUE MEASUREMENTS: Fair Value, by Balance Sheet Grouping (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable	[1]	$ 3,804	$ 3,804
Debt Instrument, Fair Value Disclosure	[1]	1,744,991	1,745,678
Reported Value Measurement [Member] | Idaho Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	[1]	1,744,991	1,745,678
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Receivable	[1]	3,804	3,804
Debt Instrument, Fair Value Disclosure	[1]	1,867,331	1,858,666
Estimate of Fair Value Measurement [Member] | Idaho Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Fair Value Disclosure	[1]	$ 1,867,331	$ 1,858,666
[1]	Notes receivable and long-term debt are categorized as Level 3 and Level 2, respectively, of the fair value hierarchy, as defined earlier in this Note 11.

SEGMENT INFORMATION_ Level 4 (D

SEGMENT INFORMATION: Level 4 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information
Revenues	$ 302,544	$ 280,956
Net Income Attributable to IDACORP, Inc.	33,006	25,530
Net Income Attributable to IDACORP, Inc.	33,102	25,729
Total assets	6,229,948		$ 6,289,897
Idaho Power Company
Segment Reporting Information
Revenues	301,964	280,566
Net Income Attributable to IDACORP, Inc.	32,482	25,534
Total assets	6,178,648
All Other
Segment Reporting Information
Revenues	580	390
Net Income Attributable to IDACORP, Inc.	620	195
Total assets	74,472
Eliminations
Segment Reporting Information
Revenues	0	0
Net Income Attributable to IDACORP, Inc.	0	0
Total assets	$ (23,172)
Idaho Power Company
Segment Reporting Information
IERCo's ownership percentage in Bridger Coal Company	33.00%
Net Income Attributable to IDACORP, Inc.	$ 32,482	$ 25,534
Total assets	$ 6,178,648		$ 6,236,744

CHANGES IN ACCUMULATED OTHER 46

CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME: Level 4 (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income
Amortization of prior service cost	[1]	$ 32	$ 42
Amortization of net loss	[1]	741	883
Total reclassification, before tax - pension and postretirement benefits		773	925
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	[2]	(302)	(361)
Total reclassification, net of tax - pension and postretirement benfits		471	564
Reclassifications		471	564
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(20,882)	(21,276)
Reclassifications		471	564
AOCI - Ending Balance		(20,411)	(20,712)
Accumulated Defined Benefit Pension Items
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications		471	564
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
AOCI - Beginning Balance		(20,882)	(21,276)
Reclassifications		471	564
AOCI - Ending Balance		$ (20,411)	$ (20,712)
[1]	Amortization of these items is included in IDACORP's condensed consolidated income statements in other operating expenses and in Idaho Power's condensed consolidated income statements in other expense, net.
[2]	The tax benefit is included in income tax expense in the condensed consolidated income statements of both IDACORP and Idaho Power.