May 28, 2019

The Energy Vault

2 minutes

A potentially transformative utility-scale energy storage technology has won a 2019 “World Changing Idea” award from Fast Company magazine. Known as the Energy Vault, the technology seeks to be the successor to the granddaddy of grid energy storage: pumped hydro.

Shifting water between higher and lower reservoirs is still basis of

the vast majority of global grid storage capacity. But it is limited both by its unique location

needs and by environmental regulations.

A start-up company also called Energy Vault and based in both

Switzerland and Southern California has come up with an extremely creative grid

storage concept. The technology consists

of a six-armed crane that stacks huge concrete blocks using a currently

available source of cheap and abundant grid electricity, and then drops them

down to generate electricity when needed.

The system is said to operate at about 90% efficiency and can deliver

long-duration storage at half the prevailing price on the market today.

A full-scale Energy Vault plant, called an Evie, would look like a 35-story crane with six arms, surrounded by thousands of manmade concrete blocks, weighing nearly 40 tons each. When charging, the plant will stack the blocks around itself higher and higher in a Babel-like tower. To discharge, the cranes drop the blocks down, generating power from the speedy descent. This configuration can deliver 4 megawatts of power and store about 35 megawatt-hours of energy.

There isn’t even a factory needed. The company would deliver a crane from a manufacturer. The crane will then assemble the blocks onsite using recycled concrete. Operation is then fully automated. The system is expected to run for 30 or 40 years.

So far there is only a one-seventh scale demo unit in

Switzerland. But this is a very

intriguing idea.

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Web Links

Energy Vault Wins World Changing Idea Award 2019 from Fast Company for Transformative Utility-Scale Energy Storage Technology

Photo courtesy of Energy Vault.

Earth Wise is a production of WAMC Northeast Public Radio.

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