I was just thinking of a few use cases where utility scale grid batteries make a lot of sense. With tidal power, you have a predictable down time between tides, so it would make a lot of sense to use batteries to cover those few hours in between. That, of course depends on tidal proving itself.
Another one is diesel electric freight trains. You could have a car behind the engine, and use regenerative braking and generation on downhills to charge it. Thoguh it would probably be complicated to add generators to all the cars, maybe it is worth it still to just run it on the engines, or have a few stubby power cars down the train that handle regenerative braking and extra drive?
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