REGULATORY MATTERS: Open Access Transmission Tariff Rates (Details) - Federal Open Access Transmission Tariff Rates - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Open Access Transmission Tariff Rates [Line Items]
Open Access Transmission Tariff Rate	$ 27.32	$ 31.25	$ 34.90	$ 25.52
Net Annual Transmission Revenue Requirement	$ 107,000,000.0

The load change adjustment rate is an element of the rate mechanism that recognizes the power supply expenses recovered through base rates change as loads increase or decrease. Rate is per megawatt-hour. This tag can also represent the open access same time draft rate, which is stated in kW/yr.

No definition available.

Name:	ida_LoadChangeAdjustmentRateOrOpenAccessSameTimeDraftRates
Namespace Prefix:	ida_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant