I am not a mechanical storage person. Can someone who is or adjacent provide context if this will ever be cost competitive with lithium or sodium battery storage (which can also provide grid support)?
It doesn't have to be cost competitive because it offers additional function. Mechanical storage (and generation) provide frequency regulation as well.
Batteries do frequency regulation, and respond within ~200ms of an anomaly, faster than any mechanical inertia or spinning generation can. If they’re at cost parity or cheaper than the flywheel, why flywheel?
