The aerostats are large fabric envelopes filled with helium, and can rise up to an altitude of 15,000 feet (4,600 m) while tethered by a single cable. The largest lifts a 1000 kg payload to an operating altitude providing low-level, downward-looking radar coverage. The aerostat consists of four major parts or assemblies: the hull and fin, windscreen and radar platform, airborne power generator, and rigging, and tether; they are kite balloons obtaining aerodynamic lift from relative wind as well as buoyancy from being lighter than air.
1000 kg payload, so one or two small wind turbines (150 m² both) for a potential of about 100 kW at 15 m/s wind speed. The altitude could be limited to about 200 or 300 m, the turbines becoming larger thanks to the tether saving. After all why not?