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Transmission lines are the interstate freeways for electricity, with on-ramps from diverse generating sources and off-ramps
to customers and communities who need power. Energy use is increasing and significant additions to our transmission system
will be required in the next 10 years.
Our Integrated Resource Plan
(IRP) identifies a need for more transmission lines to deliver electricity from new generating resources – either from new
generating plants, or to provide a path for additional energy purchases from other entities in the region. Published every
two years, the IRP provides a framework and plan for the prudent future actions necessary to ensure we continue to provide
reliable and low-cost electricity to customer throughout our six-state service area. Our IRP is developed with considerable
public involvement from customer interest groups, regulatory staff, regulators and other stakeholders.
We are involved in discussions at state and federal levels on the critical need to expand transmission systems in the region.
We are currently in the process of studying and planning transmission expansion projects identified inside and outside of
the IRP planning process. This process includes very long-range planning to ensure our transmission system integrates well
with other utility systems in the Western Electricity Coordinating Council (WECC).
Below are links to the information on transmission projects now in progress, including several that are part of our Energy
Gateway Transmission Expansion program, announced in May 2007. Click to find maps, background information and important dates
in the public approval process.
Current projects
(Updated June 30, 2008)
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