The world's only major nuclear plant in a desert runs on treated sewage water.

Science · Published 20 October 2026 · Updated 21 October 2026 Swipe more like this →

In short: Deep in the Sonoran Desert, the Palo Verde Generating Station defies conventional engineering. While most nuclear plants require proximity to massive bodies of water for cooling, this facility relies on recycled wastewater from nearby municipalities. It stands as a critical, albeit controversial, energy hub for the American Southwest.

Located about 45 to 55 miles west of Phoenix, Arizona, Palo Verde is a massive engineering undertaking. Commissioned between 1986 and 1988, the plant consists of three pressurized water reactors that collectively generate about 3.3 gigawatts of electricity. It is the only large nuclear facility globally not situated near a major body of water. To manage the intense heat of the desert, the plant evaporates up to 26 billion gallons of treated sewage water annually in its cooling towers, a process that accounts for roughly 25 percent of the annual overdraft in the Phoenix Active Management Area.

The facility's history is marked by both strategic importance and significant scrutiny. During the Cold War, it was reportedly a target in Soviet war plans, and it remains a focus of homeland security today. The plant has faced operational challenges, including a period of heightened monitoring by the Institute of Nuclear Power Operations starting in 2007 due to safety citations, such as the discovery of a dry pipe in an emergency system. However, by 2009, the Nuclear Regulatory Commission reported substantial performance improvements and reduced its oversight intensity.

Controversy has also surrounded the site's selection. Critics have long argued that the location was chosen for its proximity to land owned by a relative of the then-president of Arizona Public Service, Keith Turley, rather than for its suitability. Concerns were further raised regarding the plant's placement in the path of prevailing westerly winds, which could theoretically put the Phoenix-Mesa metropolitan area at risk in the event of a major accident. Despite these debates, the plant remains a cornerstone of the regional power grid, with its 500 kV switchyard serving as a vital reference point for electricity pricing across the Southwest.

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