Interest Rate Addition to Base Rate, where base rate is based on an index, such as LIBOR or Federal Funds.

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- Definition

The maximum amount of letters of credit aggregate principal outstanding permitted at any one time under the credit agreement.

+ Details

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Namespace Prefix:	ida
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility that the entity could request to increase.

+ Details

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Namespace Prefix:	ida
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Balance Type:	credit
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- Definition

Maximum indebtedness for which regulatory approval has been granted without consideration of any actual credit facilities in place.

+ Details

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- Definition

The maximum amount of swingline loans' aggregate principal outstanding permitted at any one time under the credit agreement.

+ Details

Name:	ida_SwinglineLoanMaximumPrincipalOutstanding
Namespace Prefix:	ida
Data Type:	xbrli:monetaryItemType
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- Details

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 19, 22

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

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-Name Accounting Standards Codification

-Topic 944

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 16

-Subparagraph a(1)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

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NOTES PAYABLE: Level 4 (Details) (USD $)	Oct. 26, 2011	Sep. 30, 2011	Dec. 31, 2010
IDACORP
Short-term borrowings:
Commercial paper outstanding		$ 51,500,000	$ 66,900,000
Weighted-average annual interest rate		0.42%	0.43%
Credit facility:
Credit facility	125,000,000	100,000,000
Swingline Loan, Maximum Principal Outstanding	15,000,000
Letter of Credit, Maximum Borrowing Capacity	50,000,000
Line of Credit Facility, Right to Increase Borrowing Capacity	150,000,000
Amount outstanding on credit facility		0
IDACORP \| Federal Funds Rate [Member]
Credit facility:
Interest Rate Addition to Base Rate	0.50%
IDACORP \| LIBOR Rate [Member]
Credit facility:
Interest Rate Addition to Base Rate	1.00%
Idaho Power Company
Short-term borrowings:
Commercial paper outstanding		0	0
Credit facility:
Credit facility	300,000,000	300,000,000
Swingline Loan, Maximum Principal Outstanding	30,000,000
Line of Credit Facility, Right to Increase Borrowing Capacity	450,000,000
Amount outstanding on credit facility		0
Regulatory authority to incur short-term indebtedness		$ 450,000,000
Idaho Power Company \| Federal Funds Rate [Member]
Credit facility:
Interest Rate Addition to Base Rate	0.50%
Idaho Power Company \| LIBOR Rate [Member]
Credit facility:
Interest Rate Addition to Base Rate	1.00%