SSE and Viking Energy are to apply for taller turbines at the consented 457MW Viking wind farm on Shetland.
The developers will ask Scottish minister to approve an increase to 155-metre tips from the currently permitted 145 metres.
Hubs under the revised plan will be at 95 metres with rotors of 120 metres in the frame.
“The change is intended to ensure the 103-turbine wind farm keeps up with the latest turbine technology which has advanced considerably since the project launched more than 10 years ago,” said Viking.
Hardware of around 4MW and up “would enable Viking to increase its generation of renewable electricity to a level closer to its consented capacity”, it added.
Viking will bid into the UK Contracts for Difference auction in spring 2019.
Project director Ian Innes said: “Viking is now competing against a new generation of wind farms, including those offshore, where tip heights of 200 metres or more are now available.”
Shetland hosts one of the tallest onshore machines in the UK (pictured) built by local developer Shetland Aerogenerators.