If you picture just a big wall when you hear the term dam — we're here to give you an inside look at what's really going down, and spoiler, it's pretty dam exciting.

Electric utility corporation Tennessee Valley Authority celebrated 90 years by opening up public tours of its dams — some for the first time since 9/11. City Editor Haley was able to take a guided tour through the Raccoon Mountain Pumped-Storage Plant. Grab your hard hat + take a virtual tour with us through the hydroelectric facility.

The folks over at TVA provide all of the safety equipment you'll need for the tour. | Photo by NOOGAtoday

Fun facts

The plant was constructed from 1970 to 1979.
Raccoon Mountain powers ~one million homes alone + is the largest rock-filled dam constructed by TVA.
The man-made reservoir above spans about 528 acres of water surface + holds 107 billion gallons of water (it takes roughly 28 hours to fill up).

Maintenance Foreman Tony Weathers said Raccoon Mountain is a special asset because it can pump water + generate power depending on low and high demands.

During high demand, water is released via tunnel to drive the generators. | Photo by NOOGAtoday

Equipment

Transformers | Uses insulating oil which will get cooled down by rock water
Chillers | Keeps the entire facility + equipment cool, two pumps work to take water and pump it back into the river
Phase reversal switches | Swaps between "A" and "B" phases to change functions as a motor or generator
Motors | Takes water from the river and pumps it into the reservoir
Generators | Takes water from the reservoir and creates power

How does it all work? The plant acts like a large storage battery. Once a 60-hertz cycle is created, it will go out onto the transmission lines for the usage of utility companies like EPB. Raccoon Mountain generates about 14 times more power than the Chickamauga Dam.

"With all of the clean-energy initiatives, it doesn't get cleaner than the Raccoon Mountain hydropower." — Tony Weathers