High-Altitude Wind Power System WindHarvest Completes 100-Day Continuous Operation in Norway

High-Altitude Wind Power System WindHarvest Completes 100-Day Continuous Operation in Norway

On October 8, 2030, Norwegian high-altitude wind energy company Kitemill announced that its WindHarvest system completed a 100-day continuous operation test at the Vats test site in Norway. WindHarvest uses a tethered drone with a 12-meter wingspan to capture persistent, stable high-altitude air currents at 1,200 meters, generating electricity by pulling a ground-based generator.

The core advantage of high-altitude wind energy lies in wind speed and stability. At 1,200 meters, average wind speeds are about 2 to 3 times those at ground level, and are nearly unaffected by weather systems, with wind energy density approximately 8 to 27 times that at the surface. Kitemill's test data shows that WindHarvest achieved an average power output of 480 kilowatts over the 100-day period, with a capacity factor of 72% — far exceeding ground-based wind power's 25% to 35%.

Kitemill CEO Thomas Hårklau said: "The biggest technical challenge for high-altitude wind energy is not generating power, but keeping the aircraft operating safely in adverse weather. WindHarvest experienced 12 major wind events during the 100 days (ground-level wind speeds exceeding 25 m/s), but wind speed changes at 1,200 meters were minimal, and the system maintained stable operation throughout."

WindHarvest's safety mechanisms include: automatic drone recovery to the ground when wind speeds exceed safety thresholds; fiber-optic sensors embedded in the tether cable monitoring tension changes in real time; and multiply redundant flight control systems ensuring that single-point failures do not cause the aircraft to break free.

In terms of economics, WindHarvest's levelized cost of energy is approximately $0.035 per kWh, below onshore wind's $0.04 and offshore wind's $0.07. Kitemill plans to build a 5-megawatt WindHarvest array (10 drones) in 2031 and begin supplying power to remote communities in northern Norway.

Competitors in the high-altitude wind energy space include U.S.-based Altaeros and Italy's KiteGen, but Kitemill is the first company to complete a 100-day continuous operation test.