Moventas said prototype deliveries and serial production of the new technology will both begin in 2015.

The gearbox is based on Moventas’ new Exceed series of high torque-density gearboxes.

The Finland-based wind technology group has been working with Acciona on the 3MW upgrade since 2012.

It provides 20% more torque density with a 10% size reduction, Moventas said.

Delivery of the new product will run in parallel with, and eventually supersede, the existing 3MW Moventas gearbox that Acciona has been using since 2009.