Summary in 2011 by Dave Santos:

Toward Gigawatt-Scale Kite Energy.
Kite stacks, trains, and arches are dense-array models for aggregated capacity with enhanced safety and reliability. Testing these methods led KiteLab Group to an Airborne Latticework concept validated in numerous scale-prototype experiments. Dense-arrays mitigated cubic-mass scaling penalty, boosted stream-tube efficiency, and maximized energy extraction by volume, with reduced surface sprawl and integrated control. “Minimal-mass-aloft” by ground-based actuation and avionics favored high-altitude operation, persistence in calm, and inherent stability. Persistent flight was shown by phased radial tugs or towing. Launching and landing succeeded by self-cascaded sequences. High L/D kiteplanes and turbines resisted mishap flown semi-captive in arrays. Self-oscillating power wingmills on ganglines and halyards “fired” in passive synchrony; a means to drive the largest generators. Hotswapping, depowering, and “killing” elements was shown. Arrays were assembled mid-air and towed into place. No critical barrier seems to prevent scale-up of kite energy, even legacy power plants retrofitted as kite hybrids. Aviation regulations offer a basis for large automated operations supervised by a Pilot-In-Control and Visual Observer, rotated in watches. Utility airborne energy in 2025 will involve Super-Density Operations (SDO) in NextGen Airspace.