Idaho Power - Interconnection Guidelines (Idaho)

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Rules Regulations Policies Program

Place Idaho
Name Idaho Power - Interconnection Guidelines
Incentive Type Interconnection
Applicable Sector Commercial, Industrial, Residential, Developer
Eligible Technologies Solar Thermal Electric, Photovoltaics, Wind, Biomass, Hydroelectric, Fuel Cells, CHP/Cogeneration, Other Distributed Generation Technologies
Active Incentive No
Implementing Sector Utility
Energy Category Renewable Energy Incentive Programs
Applicable Utilities Yes

External Disconnect Switch Yes

Insurance Requirements Not specified

Net Metering Required Yes (utility guidelines)

System Capacity Limit 100 kW for net-metered systems; no limit specified for qualifying facilities that are not net-metered

Date added to DSIRE 2003-06-18
Last DSIRE Review 2006-11-01

References DSIRE[1]


Idaho has not established uniform interconnection rules and procedures for net-metered systems or for large distributed-generation (DG) systems. However, through their respective net-metering tariffs, each of the state's three investor-owned utilities -- Avista Utilities, Idaho Power and Rocky Mountain Power -- has established outlines for the interconnection of small renewable-energy systems.

Idaho Power's interconnection guidelines cover net-metered systems up to 100 kilowatts (kw) and larger DG systems. Idaho Power's rules are broken down by system capacity, and include provisions for systems under 25 kW; systems between 25 kW and 100 kW; systems between 100 kW and 1 megawatt (MW), and systems larger than 1 MW. The rules are intended to be simple for systems under 100 kW -- particularly for net-metered systems under 25 kW.

Idaho Power's interconnection guidelines include these provisions:

  • Dedicated transformers could be required (but likely will not be required for systems under 100 kW).
  • A manual, lockable disconnect switch is required for all systems.
  • All electrical specifications, such as voltage ranges, harmonics and power factor, are based on current UL, IEEE and NEC standards.
  • Control relays are required for systems with an inverter that doesn't comply with IEEE 1547.
  • Acceptance testing is not required for UL-listed inverters.
  • Systems under 25 kW must be inspected once every three years if the project uses interconnection equipment that meets nationally recognized standards and if the system is approved by Idaho Power in advance. All other projects must be inspected annually.
  • The owners of systems that are not net-metered must pay the Idaho Power a monthly operation and maintenance charge.

Idaho Power's interconnection web site, shown above, inlcudes applications and tariffs for net metering, and a four-step process for generators less up to 20 MW, and documents relevant to interconnecting systems exceeding 20 MW.

Incentive Contact

Contact Name Rowena Bishop
Department Idaho Power Company
Address P.O. Box 70
Place Boise, Idaho
Zip/Postal Code 83707
Phone (208) 388-2658

Contact Name Rick Sterling
Department Idaho Public Utilities Commission
Address 472 W. Washington
Address 2 PO Box 83720
Place Boise, Idaho
Zip/Postal Code 83720-0074
Phone (208) 334-0351


  • Incentive and policy data are reviewed and approved by the N.C. Solar Center's DSIRE project staff.[1]


  1. 1.0 1.1  "Database of State Incentives for Renewables and Efficiency (DSIRE)"