Key Information for wind developers from the Eskdalemuir Interim Guidelines
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Key information for wind developers from the Eskdalemuir Interim Guidelines

Key information for wind developers from the Eskdalemuir Interim Guidelines
May 30, 2014 Amy Sudbury

We have known it was coming since the end of April, and now they have been published. The much anticipated interim guidance document for Eskdalemuir Seismic Array (EKA) and wind developments. And findings from a RenewableUK study say that up to 1GW of wind potential could be unlocked.

The interim guidance came about because new research created a model that indicated there was room – in terms of seismic vibration – for additional wind turbines to be built within the 50km Eskdalemuir Consultation Zone. This area has a seismic ground vibration – or noise budget – threshold of 0.336nm, which can’t be exceeded.

Nestled away within one and a half pages of guidance are the following key bits of information you should know:

  • The Ministry of Defence (MOD) are withdrawing wind development objections relating to the operation on the seismological monitoring station. Provided that the application was submitted before December 2013.

This is the news that caught the industry’s attention, when it first came to light in the Eskdalemuir Working Group Progress Update Note, but is re-iterated in the guidance for good measure.

For applications submitted into the planning system after December 2013, the MOD will use its best efforts to withdraw objections.

  • The Scottish Government will soon publicly consult on increasing the 10km Exclusion Zone to 15km.

Eskdalemuir Seismic Array Wind Turbine Consultation Zone Map

For the applicants of wind developments that fall within a 15km circular area centred on the array, you may have to wait for planning decisions. Until the outcome of the consultation is known, planning authorities have been advised to “delay determining any applications”.

Helpfully, the “Eskdalemuir Exclusion and Consultation Zones” map has been updated to include the proposed new exclusion zone. You can see the map here.

  • Planning authorities should grant planning permission conditionally so as to ensure the developer submits to the MOD final built details of:

o   hub height

o   rotor diameter

o   location of turbines

The new model, used to calculate the seismic ground vibrations from wind turbines, uses these parameters. So planning authorities will be ensuring that developers provide this information to the MOD promptly.

  • The model has not been adapted for machines smaller than 40m to hub, twin-blade or down-wind turbines.
    For now, in calculations, they will be represented as a standard triple blade, up-wind, 40m to hub turbine.

The new model, used to calculate the seismic ground vibrations from wind turbines, “was developed using data from large triple-bladed, upwind technologies”. So until the model has extended scope for these technologies, all will be represented as stated above.

  • A review will be carried out by the Scottish and UK Government when 90% of the available ground vibration threshold for turbines in the 50km consultation zone is reached.

The overall take away message from these interim guidelines is that there is movement on this issue where there hasn’t been for years. It reminds us that through accurate modelling, and hard work there can be an acceptable way forward.

Image sourced from the Scottish Government Website, Contains Ordnance Survey data © Crown copyright and database right 2014.


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