Submission + - Gravitricity energy storage goes bankrupt, but two others keep on trying (autonocion.com)
Geoffrey.landis writes: Gravitricity, a Scottins corporation that proposed using gravitational potential energy to store electrical energy, went bankrupt at the end of 2025. The basic idea is so simple, even a freshman physics student could describe it: use an electric motor to raise a weight up against gravity, and then when you need energy, lower the weight back down, and use the energy to run a generator. The difficulty, however, is in scale. Their proof of concept unit, a 40-ton block of steel falling the height of a 30-story building, stores an amount of energy equal to about eight hours of an average American home’s electricity. Their solution was to go big: there are literally millions of abandoned mine shafts around the world, many of them kilometer and more deep. They proposed a full GraviStore system would hang up to 24 separate weights of 500 metric tons each from cabled winches inside a single shaft. Twelve thousand metric tons of suspended steel, going up and down forever. But turning their concept into a reality ended up spending money faster than it could be invested, and, so quietly it took investors three months to even notice, the company went bankrupt.
But the basic concept may not be dead. Several other companies are still working at turning the concept into reality. And hundreds of thousands of abandoned mines are scattered across the United States, most of them a liability, a few of them with a kilometer of free vertical drop and a hoist house and a grid connection already sitting on site.
But the basic concept may not be dead. Several other companies are still working at turning the concept into reality. And hundreds of thousands of abandoned mines are scattered across the United States, most of them a liability, a few of them with a kilometer of free vertical drop and a hoist house and a grid connection already sitting on site.
