[consultutah]

Isn’t that exactly what this company is selling? https://www.torus.co/

[h0l0cube]

It sounds unbelievable.

> Energy Retention After 10 Years 100%

> Potential Storage Capacity 1 day 32 kWh, 10 years 116,800 kWh, 25 years 292,000 kWh

What's the down side? Is it expensive? Is it slow to release energy on demand?

[pjc50]

Everyone still slightly worried about what happens if it cracks, and I think the cost of lithium batteries has simply won?

[sowbug]

Neat! Hadn't heard of them. I think the company I remember was called Ballard, and their flywheels were intended to drive the vehicle mechanically rather than to generate electricity.