The developer intends to use 14 turbines with power ratings of up to 6MW and tip heights of 180 metres at its planned 77MW Clashindarroch II Clashindarroch II (77MW) OnshoreScotland, UK, Europe Click to see full details wind farm in Aberdeenshire, north-east Scotland.
It claims the new project could produce 2.5 times as much power as its existing 36.9MW Clashindarroch wind farm, which uses 2.05MW Senvion turbines and was commissioned in 2015.
Vattenfall explained that Clashindarroch II’s taller turbines’ greater energy yield can help to make projects economically viable in the absence of subsidies for onshore wind in the UK.
It added that as the turbines will be taller than 150 metres, the UK’s Civil Aviation Authority would require visible aviation lights on the nacelles to alert aircraft flying overhead.
Developers are increasingly looking to taller, more powerful onshore turbines to improve wind farms’ economics as traditional support schemes decline in availability.
Siemens Gamesa won an order in December to supply 35 turbines with power ratings of 6.6MW for a wind farm in north-east Sweden.
Developer CWL Energy, meanwhile, has submitted a scoping report for a 560MW wind farm in Scotland that would use turbines with power ratings of 5-7MW and tip heights of 200-240 metres.
Vattenfall hopes to receive consent for the project in 2021, before starting construction in 2022 and commissioning in 2024.