And it could be used in a smart grid environment to provide a stabilization power... after all, it's known when a ship will be needing the power (divide the distance by the top speed and the ship physically cannot arrive earlier), and so as long as it is ensured that the battery is topped up when the ship arrives for a recharge, the capacity can be used for grid stabilization.

I imagine when batteries are more prevalent there will be far more competition in providing grid stabilisation services.

A second order affect I imagine, once there are scores of other systems available locally.