Softbank Fund Makes Energy-Storage Bet With an Unusual Battery
SoftBank Group Corp.’s massive Vision Fund is making its first-ever energy storage bet -- and it’s on a rather unconventional type of battery.
The fund, created by Japanese tech giant SoftBank Group Corp., is investing $110 million in Energy Vault, a Swiss startup that’s using cranes and concrete to store energy. An electric crane hoists up blocks of concrete and stacks them into a tower when power is plentiful. When power is needed, it uses gravity to take the structure apart brick by brick. The weight of the descending blocks converts kinetic energy into electricity.
The startup faces stiff competition. Huge lithium-ion batteries have emerged as the storage of choice for utilities looking to deal with short-term fluctuations on their grids. The costs of those have plunged 85% since 2010. Entrepreneurs have long pitched alternatives that can hold more energy and supply for longer -- including ones that compress and liquify air and split and store hydrogen, but none have taken off the way lithium-ion has.
Softbank’s $100 billion Vision Fund is betting on the need for more affordable and bigger storage systems to expand the use of renewable power and wean the world off fossil fuels. Even as the price of wind and solar plummets, they remain intermittent, supplying electricity to the grid at some times and not others. Unlocking a cheap way to bottle up clean power and dispatch it at will could change everything.
Energy Vault uses the same principle that’s long been employed by pumped-hydro storage dams, which use huge reservoirs and gravity to store energy and generate power. SoftBank is convinced the tower concept can scale quickly, with the systems installed next to existing solar power plants or wind farms.
Aug. 20, 2019