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Bulk Transmission Transmission Siting & Interconnection in Idaho

Regulatory Information Overviews

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At a Glance

Jurisdiction: Idaho

State Siting Act: Idaho Statutes Title 61 Chapter 17 §61-1703 (For transmission lines within a NIETC)

State Preemptive Authority The Idaho Public Utilities Commission (IPUC) has authority to preempt local governments land use decisions pertaining to facilities within a Nationl Interstate Electric Transmission Corridor (NIETC). [1]

Siting/Permitting Entities: If NIETC not present then a local land use permit would be required from the local government(s) affected, If NIETC is present, then a Route Permit or Certificate of Public Convenience and Necessity (CPCN) would be required from the IPUC.

Permit/Authorization Required: For a proposed transmission line located outside a NIETC: CPCN from the IPUC, and local land use permits. For a proposed transmission line located inside a NIETC: A Route Permit is required instead of a CPCN. [2]

Triggers: CPCN: Development of a major facility for a public utility outside NIETC. Local permits: vary by local government entity and are triggered by zoning variance, building or special/conditional uses. Route Permit: Location within a NIETC and voltage of 115kV or greater. [3][4][5][1]

Application Requirements: The CPCN process is outlined in Idaho Statutes Title 61 Chapter 5 Route Permit requirements are outlined in Idaho Statutes Title 61 Chapter 17 §61-1703-1705, and local permits vary by county and municipality, but general requirements are the same per state regulation.

Permit Processing Timeframe: Route Permit can take 18 months [6]

Contacts/Agencies: Idaho Public Utilities Commission

General Transmission Siting & Interconnection Overview

The electrical grid in Idaho is part of the Western Interconnection power grid and the Western Electricity Coordinating Council (WECC). It includes the provinces of Alberta and British Columbia, the northern portion of Baja California, Mexico, and all or portions of the 14 Western states between. The WECC is the Regional Entity responsible for coordinating and promoting Bulk Electric System reliability in the Western Interconnection, including in Idaho. In addition, WECC provides an environment for coordinating the operating and planning activities of its members as set forth in the WECC Bylaws.

In addition, some transmission owners in Idaho are part of the Northern Tier Transmission Group (NTTG). The NTTG is a group of transmission providers and customers that are actively involved in the sale and purchase of transmission capacity of the power grid that delivers electricity to customers in the Northwest and Mountain States. Transmission owners serving this territory work in conjunction with state governments, customers, and other stakeholders to improve the operations of and chart the future for the grid that links all of these service territories.

Idaho Power, Bonneville Power Administration, Rocky Mountain Power, and Avista are the investor owned utilities in Idaho. Idaho Consumer-Owned Utilities Association represent municipal and cooperative utilities.

Idaho Office of Energy Resources

The Office of Energy Resources (OER) was created by Idaho Governor C. L. "Butch" Otter by executive order to help secure the state's energy outlook. Toward that goal, the OER leads Idaho's efforts to help facilitate the development of critical transmission projects as they emerge. The OER focuses on establishing a harmonized effort with the federal, tribal, and state agencies, departments, divisions, and local governments for the purpose of insuring that Idaho's energy needs are satisfied.

State Transmission Siting & Interconnection Process

The State’s direct authority to site high-voltage transmission lines is limited to transmission lines located within a NIETC; however, no NIETCs currently exist within Idaho so the authority has not been put into practice. Siting authority belongs to local governments or federal agencies that manage the land where the proposed transmission line would be located. Public utilities that propose to build a major facility must obtain a CPCN from the IPUC. A public utility is defined as any electric corporation delivering service to the public [7] and major facilities of a public utility include any electrical facilities used for the transmission of electricity.[8]

The typical process for siting and permitting high-voltage transmission lines is to obtain a CPCN from the IPUC, to carry out siting with local authorities who govern the land proposed for the development, and to obtain local land use permits prior to construction. State agencies may have siting authority if a proposal would be located on state managed lands.

The CPCN application is based on the need of the public for the project to be constructed. After the CPCN application is submitted, the PUC will hold a public hearing to discuss the company’s financial ability to develop the project and the state and regional need for the project. The CPCN must be granted before permitting and siting with local governments may proceed.

The IPUC can grant priority designation to projects to expedite the permitting process, for transmission lines 230kV or greater. Priority designation speeds up the CPCN process by requiring participating agencies to prioritize review of the project. Priority designation applies to Route Permits, but as previously mentioned, none have been completed due to the lack of NIETCs in Idaho. The project must be recommended for priority by one of the reviewing state or local agencies. The IPUC then has the opportunity to review the case and approve or deny priority designation based on the benefit the project would bring to Idaho electric customers, if the project would improve reliability and capacity in the state and region, and if the project promotes public interest.[9]

The utility may use eminent domain to site transmission lines per Idaho Statute Title 7 Chapter 7 § 7-701.

The IPUC authority to site high-voltage transmission lines that are 115kV or greater is limited to proposals located within a federally-designated NIETC. There are no designated NIETCs in Idaho, and this permit process is not utilized at this time. NIETCs are designated geographic areas where transmission congestion or constraints adversely affect consumers. These corridors are designated under Section 206(a) of the Federal Power Act (created by section 1221(a) of the Energy Policy Act of 2005) which directs U.S. Department of Energy (DOE) to identify transmission congestion and constraint problems. If a proposal is located in a federally designated energy corridor of Section 368 of the Energy Policy Act of 2005, siting and environmental review authority would go to the federal land management agency that manages the area.

If the IPUC has siting authority, a Route Permit will be required instead of a CPCN. For Route Permits, the applicant does not have to demonstrate need because with the presence of NIETCs, the legislature finds that “the efficient and safe transmission of electricity is critical to the well-being of the citizens and the economy of this state, the region and the nation.” In the Route Permit process, local siting authority can be preempted.

Local Transmission Siting & Interconnection Process

The typical siting process for a transmission line in Idaho will fall to the local units of government in the form of local siting permits, because NIETCs are lacking within Idaho. Title 67 Chapter 65 of Idaho Code extends authority to the counties to include transmission corridors in their comprehensive plans and provides ordinance authority and processes for granting such permits. When the siting process falls to the county level, utilities are required to work with local governments to determine siting.

Counties and municipalities have the authority to establish zones or zoning districts, and within these districts may establish specific standards for structures (including transmission lines). The process for zoning amendments is consistent across the state. As part of the zoning ordinance, local governments may require special use or conditional use permitting for transmission lines. Specific requirements will vary by local government.

Because the majority of land in Idaho is publicly managed, siting process negotiations often take place between the utility and state and federal land management agencies.

Policies & Regulations


  1. 1.0 1.1 Idaho Statutes Title 61 Chapter 17 §61-1703-3 (2014).
  2. Westgov.org [Internet]. [cited 2014/09/25]. Available from: http://www.westgov.org/wieb/transmission/state-province/Idaho.pdf
  3. Idaho Statutes Title 61 Chapter 5 §61-526 (2014).
  4. Idaho Statutes Title 61 Chapter 5 §61-541 (2009).
  5. Idaho Statutes Title 67 Chapter 65 §67-6508 (2014).
  6. Idaho Statutes Title 61 Chapter 17 §61-1705-5 (2014).
  7. Idaho Statutes Title 61 Chapter 1 §61-129 (2014).
  8. Idaho Statutes Title 61 Chapter 1 §61-118 (2014).
  9. Idaho Statutes Title 61 Chapter 5 § 61-516 (2014).

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