Transmission and Power Lines

Idaho Power has more than 4,800 miles of high-voltage transmission lines across its service area. Transmission lines move electricity across long distances. These lines are typically 138,000 or 230,000 volts.

Transmission Planning

The number of Idaho Power customers continues to grow significantly. This growth means more energy is needed, and that energy must travel across our power lines — the “freeways” of electricity transport.

Our planning engineers monitor customer growth and how much energy is needed. They often work with community advisory groups to create plans for providing reliable service. These plans include recommendations for where to build facilities like power lines and substations. We invite you to participate in creating these plans. Project information is also available.

Learn how we plan for growth.

Transmission Services

Idaho Power provides transmission services on a non-discriminatory basis under its Federal Energy Regulatory Commission (FERC)-approved open access transmission tariff, or OATT.

When there’s space available on a transmission line, we transmit electricity for other companies. Transmission space on Idaho Power’s system may be requested only over Idaho Power’s Open Access Same-Time Information System (OASIS). Idaho Power’s OASIS site provides additional information about transmission services, including information about Available Transfer Capability, Idaho Power’s OATT and associated rules, standards, and business practices, and Idaho Power’s implementation of FERC’s Standards of Conduct. All requests for transmission service must be made on OASIS.

For more information, contact Beth Ryan at 208-388-2846.

Does Idaho Power Install Power Lines Underground?

Idaho Power usually installs power lines above ground (also called overhead lines). This is the most cost-effective for customers.

Installing power lines underground is much more expensive.

Any request to install a proposed power line underground would require advance payment from the person making the request. This payment would be used to perform a detailed engineering analysis of the project.

If the analysis showed the project was possible, the person making the request would have to pay in advance for the increased cost of installing and operating the transmission line underground.

For more information on underground power lines visit our frequently asked questions section.