How Hydroelectric Power Works

How a Conventional Dam Works

A conventional dam holds water in a man-made lake, or reservoir, behind it. When water is released through the dam, it spins a turbine connected to a generator that produces electricity. The water returns to the river on the downstream side of the dam.

How a Pumped-Storage Plant Works

The pumped storage plant uses two reservoirs, with one at a much higher elevation than the other. To produce power, water is released from the higher reservoir through a tunnel in the mountain to drive generators in an underground power plant.

When power demand drops at night and on weekends, the turbines reverse and pump water back to the upper reservoir where it can be released again when demand requires.

Learn more by visiting the Raccoon Mountain Pumped Storage Plant

Visitor Centers

Looking for free family fun? Visit TVA’s visitor centers to explore hydroelectric dams, learn TVA history, enjoy scenic trails and discover recreation across the Tennessee Valley.

Located across our seven-state region, TVA visitor centers offer free, family-friendly experiences with educational exhibits, beautiful views and outdoor activities for all ages.

Explore TVA Visitor Centers

Learn with TVA

Interested in STEM, robotics, energy, history or the environment? Check out our resources and opportunities for kids and educators.

Learn with TVA!