Let us leave aside the flywheel effect. A perhaps simpler way to save space would be to install a circle of HAWT wind turbines at sea. Part of said wind turbines being in the direction of the wind would operate. Some downwind HAWT could also work if the circle is large enough compared to turbine height. Such an installation would allow to remove the requirement of 5 to 10 times the rotor diameter spacing in all directions between two HAWT.
