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I guess with a harbor crane type of system where the crane is on rails, you could scale to a higher energy storage with similar power.

Don't know what the sweet spots of capacity vs power are on different markets. This could be good for long term storage.

Yes, I was surprised they showed a tower crane rather than a bridge/gantry type, which I'd imagine is much more stable for heavy loads.

Limiting factor is probably per second output, not total capacity. The crane is slow, and only can lift/drop one block at a time.