This article explains the challenges of installing the next generation of offshore turbines with nacelle weights of 1000 tons. (This is where we come in - airborne wind systems that support themselves in the air instead):
The weight of nacelles for next-generation turbines is one of the biggest issues facing installation contractors. A March 2020 recent report from the National Renewable Energy Lab in the US, University of Maine and Technical University of Denmark characterised a 15-MW offshore wind turbine with a fixed-bottom monopile support structure that had a rotor diameter of 240 m, hub height of 150 m and a nacelle mass of around 1,000 tonnes. That kind of weight requires a vessel and crane capable of lifting significantly more than that. Lifting height and outreach are also key.