Slashdot Mirror
Can Hoover Dam Become a Giant $3B Battery? (cleantechnica.com)
The Los Angeles Department of Water and Power wants to spend $3 billion to pump back the water that's flowing through Hoover Dam -- so it can flow through again later, during periods of peak energy demand. This generates a net profit for the dam's operators -- the pumping stations are powered by cheap solar and wind energy, while the dams are currently operating at just 20% of their capacity. An anonymous reader quotes Clean Technica:
The problem is that California has so much renewable energy available now, thanks in large measure to aggressive state mandated policies, that much of it is "constrained." That's utility industry speak for having to give it away or simply let it go to waste. In some cases, utilities in California actually pay other utility companies to take the excess electricity off their hands.
Why not store it all in some of Elon Musk's grid scale batteries? Simply put, pumped hydroelectric storage is cheaper than battery storage, at least for now. Lazard, the financial advisory and asset management firm, estimates utility scale lithium-ion batteries cost 26 cents per kilowatt-hour compared with 15 cents for pumped hydro storage. "Hoover Dam is ideal for this," Kelly Sanders, an assistant professor of civil and environmental engineering at the University of Southern California tells the New York Times. "It's a gigantic plant. We don't have anything on the horizon as far as batteries of that magnitude."
Why not store it all in some of Elon Musk's grid scale batteries? Simply put, pumped hydroelectric storage is cheaper than battery storage, at least for now. Lazard, the financial advisory and asset management firm, estimates utility scale lithium-ion batteries cost 26 cents per kilowatt-hour compared with 15 cents for pumped hydro storage. "Hoover Dam is ideal for this," Kelly Sanders, an assistant professor of civil and environmental engineering at the University of Southern California tells the New York Times. "It's a gigantic plant. We don't have anything on the horizon as far as batteries of that magnitude."
Sounds like due to renewables there is at times extra power that can be stored (by pumping water uphill.) You also need excess water to be pumped uphill. Does California also have this excess water? When you consider the value of the water, does it still make economic sense to put it back behind the dam? I don't know the answer or have an opinion on this, but I do keep hearing about water shortages in California, so it makes me wonder.
That's not true. The power plant was built along with the original structure. The dam was completed in 1935. In 1936 the water level in Lake Mead became high enough to begin power generation. Additional generators were added in 37 and 39. The final generator was added in 61, which might be where your confusion comes from.
"That's one dam expensive battery."
I'll go home now.
Use the waste heat from bitcoin mining to boil the ocean. the covection will carry water up into the hills providing rain to prevent fires and the ground water will end up in lake mead where it can be used to make electricity to power the mining systems
Some drink at the fountain of knowledge. Others just gargle.
The Colorado River has many dams. Not very far down the river from Hoover Dam is Davis Dam and Lake Mohave. By pumping water from Lake Mohave to Lake Mead (behind Hoover Dam), they would be releasing the same amount of water while storing excess solar power.
This is a very unusual situation. You have two large reservoir forming dams next to each other on a large river cutting through a desert with great solar power generating potential.