I don't know much about the technology - the lack of larger installations is a red flag. Anyway, I tried to calculate with the numbers from the document above with the following assumptions:
10 charging stations, 6 cars per hour per station, 100 kWh per car. That makes 6 MW peak consumption for the whole "gas" station. A capacitor storing 6 MWh (60 cars served, no incoming electricity) would need to have 120 m³ of storage. Google says that a gas station storage size is between 30 000 and 40 000 gallons (110 000 - 150 000 l) so that seems comparable. Another way to look at it - 200 m³ of storage is a building of 10 x 10 x 2 m, without the need to manipulate flammable liquids.
Not sure about the investment costs (the doc says 5 000 cycles but no cost estimate), how long the peaks are and other aspects of running a gas station. Still, it seems the order of magnitude is about right.
10 charging stations, 6 cars per hour per station, 100 kWh per car. That makes 6 MW peak consumption for the whole "gas" station. A capacitor storing 6 MWh (60 cars served, no incoming electricity) would need to have 120 m³ of storage. Google says that a gas station storage size is between 30 000 and 40 000 gallons (110 000 - 150 000 l) so that seems comparable. Another way to look at it - 200 m³ of storage is a building of 10 x 10 x 2 m, without the need to manipulate flammable liquids.
Not sure about the investment costs (the doc says 5 000 cycles but no cost estimate), how long the peaks are and other aspects of running a gas station. Still, it seems the order of magnitude is about right.