The idea of large-scale multi-rotor turbines with two or more rotors atop a single support structure has inspired inventors since the 1920s. Current renewed interest in multi-rotor technology has a strong focus within large-scale offshore. Innovative product announcements and developments up until 2017 cover especially horizontal-axis turbines for bottom-fixed foundations as well as floating wind foundations, but no scaled and/or full scale prototypes yet.

The offshore wind leap into to the 12 – 15MW+ class is ongoing with GE record holder announcing a 12MW giant with 220-metre rotor. A possible alternative route in the new superclass could become multi-rotor turbines with fresh opportunities including reduced rotor and head mass, faster scaling pace and prolonged use of existing supply chains. Shorter time-to-market due to the use of proven commercial turbine technology is another potential benefit, but the road towards commercialization will not be easy.