The Site of the proposed wind turbine is at Longley (near Hade Edge), located approximately 2km to the south of Holmfirth, West Yorkshire, adjacent to the B6106 and the Longley Farm dairy. The proposed turbine will replace the existing wind turbine and is of similar design to the original – a 3-bladed, horizontal axis turbine.
The existing turbine at Longley Farm has an approximate height of 32.5m with a rated power of 90kW. The replacement turbine will measure 46m to tip, with a rated power of 400kW.
The replacement wind turbine will generate electricity for a period of up to 20 years after which time it will either be removed, or the life of the Project may be extended subject to planning consent and agreement with Longley Farm. The new wind turbine has already received planning consent from Kirklees Council under application number 2013/62/94011/W. See website here
The wind turbine
The location of the wind turbine will be at National Grid Reference 414780E 406170N; this is about 40m further back from the hill edge compared to the current turbine location.
The turbine selection was based on a number of criteria. The turbine rating is limited by both noise and visual impact; the tip height being limited under the planning consent to 46m. Turbines in the range 100 to 400kW were considered. However, only the larger turbines are able to provide both a fair return to Members and a reasonable Community Fund.
The turbine selected for the Project is a Turbowinds T400-34. This has a 34m blade diameter and tip height of 46m. Turbowinds is a Belgium-based wind turbine manufacturer founded in 1985. Turbowinds specialise in turbines in the 300 to 600kW size range with some 1,000 turbines installed worldwide. The T400-34 model has been manufactured since 1996 and there are circa 30 operational units worldwide. There are currently 6 T400-34 turbines operational in the UK, 3 in design/ construction and a further 5 expected to be ordered shortly. The turbine will be installed and
maintained, for the first 5 year period, by the UK authorised installer for Turbowinds turbines; Enviko Limited. (www.enviko.com) The wind turbine will be connected to the local electricity distribution network via Longley Farm’s existing 11kV electricity substation.
The wind resource
The wind resource at the site has been assessed both by analysis of the output of the existing Longley turbine for the periods for which comprehensive records are available (around 5 years from the date of commissioning) and comparison with the output of the turbines owned by Banks Developments at Hazlehead and the Dunsley Poultry turbine at Cartworth Moor. The analysis has been further tested by an independent wind consultant. The mean wind speed at the hub height of the new turbine is expected to be in the range 7.0 to 7.4 m/s, giving an output of 900 to 1,000 MWh per year.
The planned timetable is for the turbine to be in operation by 14th August 2015. Preliminary FiT Accreditation has been awarded, which means that provided the turbine is commissioned and in operation before 23rd September 2015, the Project will receive the modelled 2014 FiT rates, inflated annually for 20 years. The indicative timetable for the Project is presented, right. As work progresses, Members will be informed of progress and information will be available on the HoTTWind@Longley website www.hottwindlongley.co.uk. For more regular progress updates, a facebook page has also been set up at: www.facebook.com/hottwindlongley
Carbon emissions savings
There is a carbon footprint associated with construction, delivery and maintenance of the wind turbine, but the turbine will not contribute to climate change by directly releasing carbon dioxide to the atmosphere, unlike conventional power generation. Independent studies have shown that turbines generate enough energy to ‘repay’ the embodied energy within 3 – 6 months1. The average Carbon Dioxide emissions from UK power stations, including coal, gas, nuclear and renewables are 537 kgCO2/MWh2. The carbon footprint from wind- generated electricity over the lifespan of a turbine varies between 4.6 and 10.2 kgCO2/MWh3. Assuming the worst case for wind, that equates to a saving of 463 kgCO2/MWh generated, displacing conventional generation. By displacing the need for existing generation from conventional sources, it is estimated that the Longley Farm Turbine repowering will reduce net emissions by approximately 475 tonnes of CO2 per year.
Surplus funds from the Project will be placed into a Community Fund. This fund will be used to support other local projects that reduce carbon emissions and contribute towards a more sustainable future for the Holme Valley community. HoTT will set up a green charitable trust organisation, with the surplus monies from HoTTWind@Longley gifted to this trust annually. The trust will be independent from the Society and will be managed separately, with its own Board of Trustees and terms of reference. HoTT intend that the Trustees will include representation from the local community, as well as HoTT and Longley Farm nominees. The Trustees will then administer the disbursement of the Community Fund to suitably qualifying projects.
The Trustees will co-opt appropriate expertise when needed. Accounts will be audited by an independent examiner.
In administering the disbursement of the Community Fund, the Trustees will:
- Keep abreast of climate change developments and the opportunities and needs presented by the Holme Valley and its residents
- Decide broad policy on grant making annually, taking into account the funds available and research/advice on the priorities for support
- Encourage and advise local groups on applying for grants from the Community Fund
- Evaluate grant applications – HoTT projects will not receive preferential treatment and will be evaluated in the same way as other applications
- Give balanced feedback on all applications
- Provide on-going support/mentoring for projects if needed
- Ensure monitoring information on project performance is gathered and reported