This startup turns hills into giant batteries

A U.Ok.-based startup referred to as RheEnergise is engaged on a brand new solution to retailer power, making use of gravity on hills. It’s much like current hydropower vegetation that pump water up mountains when power is affordable, after which launch it when wanted to spin generators and generate extra electrical energy. However whereas constructing an enormous dam can take a decade and even longer and makes financial sense solely on massive, steep hills, the brand new system may be constructed on smaller hills, making it possible in additional areas. It additionally has much less impression on the setting and may be constructed quicker.

[Image: Alex Maclean/courtesy RheEnergise]

As an alternative of utilizing water, the brand new system pumps a fluid that’s two and a half instances denser, which implies that it may possibly retailer the identical quantity of power on a smaller hill. The expertise may doubtlessly be put in deserted mines that at the moment are prepared for brand new makes use of. The fluid travels up and down in pipes that may be put underground in order that they aren’t seen in additional pristine areas.

[Photo: courtesy RheEnergise]

In contrast to a big hydro plant, it could possibly be scaled all the way down to retailer solely the quantity of power produced by a  typical photo voltaic farm or wind plant. “Because the power grid is transitioning to accommodate these distributed technology applied sciences, you additionally want a distributed storage expertise, so that you retailer it extra regionally to the place it’s been produced,” says Stephen Crosher, chief government of RheEnergise. “Then as you scale down the tasks, quite than taking a long time to construct them, you may construct tasks in 9 months, for a small one, and possibly 15 months for a big mission.” Another startups are engaged on different options for gravity-based power storage, corresponding to Vitality Vault, an organization that shops renewable power by lifting bricks into towers.

[Image: Alex Maclean/courtesy RheEnergise]

Whereas lithium-ion batteries could make sense when power solely must be saved for a few hours, the brand new expertise can be cheaper when the power must be saved for a number of hours earlier than it’s used. Relying on the price of renewable power in a specific space, the full price of the renewables plus the brand new storage system may already be aggressive with power from a brand new gas-fired energy plant, Crosher says.


The corporate just lately mapped out 9,500 websites within the U.Ok. with hills that would accommodate the expertise. It’s now raising funds for a pilot plant. “Commercializing this must be a speedy course of for us, as a result of our provide chain exists—we will take our IP to current producers and say, ‘You know the way to construct this,’” Crosher says. “We are able to theoretically go inside months of receiving an order to really be delivering gear to a web site.”