Powering the West

In this episode – Powering the West . . .

Welcome back to On the Fly, your podcast for curious minds exploring the unexpected. Today, we're soaring across the Pacific Northwest down to sunny California, tracing the fascinating history of the Pacific Northwest–Pacific Southwest Intertie.

Imagine a massive power line stretching over 800 miles, carrying electricity from the mighty Columbia River in the Pacific Northwest to the sun-drenched valleys of California. This is the Pacific Northwest–Pacific Southwest Intertie (Intertie), a marvel of engineering that revolutionized power transmission in the Western United States.

Professor Carl Magnusson from the University of Washington had a vision as early as 1919 to create a high-voltage network that would connect the Pacific Northwest, rich in hydroelectricity, with the energy demands of the Southwest. This vision gained momentum during the droughts in California during the 1940s, highlighting the need for a reliable power source beyond local resources.

This journey from vision to reality wasn't easy. The Bonneville Power Administration (BPA), established in the 1930s, played a crucial role in promoting the Intertie's development. The Columbia River Treaty with Canada in 1961 secured increased hydropower generation, providing a reliable energy source.

What is an Intertie?

In the context of electrical power systems, an Intertie refers to an interconnection permitting the passage of electricity between two or more separate electric utility systems. It's a network of high-voltage power lines that allows for the exchange of electricity between different regions or countries. This enables “Balancing” energy needs. Regions with surplus electricity can export to areas with higher demand, improving overall grid balance, efficiency, and reliability. (The Electric Grid)

Interconnected energy systems can share resources and enhance grid stability during disruptions. Construction finally began in 1964 after overcoming numerous obstacles, including negotiations between various stakeholders.

The construction of the Intertie was a gradual process that took different phases. The Alternating Current (AC) Intertie was constructed between 1968 and 1993 and involved the progressive building of three AC lines, each increasing the Intertie's capacity.

The Pacific Direct Current (DC) Intertie was built in 1970 and marked a significant milestone as the first long-distance high voltage direct current (HVDC) line in the United States. This development significantly increased Intertie's overall capacity and efficiency.

The Pacific Northwest–Pacific Southwest Intertie is a power system that has had a significant impact on the Western United States. It allowed for the exchange of surplus hydropower from the Northwest to California, providing a reliable power source for millions during periods of peak demand. But Intertie's benefits go beyond just exchanging power. Intertie has also improved the stability and reliability of the Western US electrical system by interconnecting the power grids of two regions. Additionally, Intertie's use of clean hydropower has helped California reduce its reliance on fossil fuels, promoting a cleaner energy future.

Looking ahead, the Intertie is constantly evolving through upgrades and potential expansions to meet the region's ever-growing energy demands. It proves the benefits of collaborative efforts, highlighting the advantages of interconnected power grids and sustainable energy solutions.

So, the next time you flip on a light switch in California, remember the invisible thread connecting you to the mighty rivers of the Pacific Northwest, a testament to human ingenuity and the power of collaboration.

I'm Patrick Ball; thanks for listening. I'll see you in the next episode.

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