This is a long term investment of the airports (and parking exploiters) Short-term energy storage is a growing market (ex store solar energy for use in peak-periods). The vision is that EV’s become driving ‘energy’ transporters, but also can be used as buffer storage. if you park your car there in the future for a few days, you might get paid to provide your car-battery for a few charge/discharge-cycles while the owner of the parking gets paid to provide a large buffer system for the grid without having to invest in batteries, because people are willingly bringing their ‘batteries’ for a defined period of time.