Wind array trial due to start on Kelston Roundhill in July

Kelston Tump LLP (the partnership of William, Klaus and Clare, the owners of Kelston Roundhill) has just authorised a small-scale test of a new prototype wind array half way up the hill. The Old Barn and the borehole providing water for cattle on Kelston Roundhill are off grid, currently powered by an ageing 27kw diesel generator. We want to use the abundant wind and sun to provide the modest amount of power needed for farming and events at the Old Barn.

The first Spinetic prototype on trial at a farm in Wilts (with car & tractor to show scale)

Designed and commissioned by Spinetic, a Wilts-based startup, the wind array is a lightweight, low-cost flexible way of harvesting wind resource. Wind arrays are drastically lower in height, have less visual impact and appear to have much less impact on wildlife than traditional turbines. We hope to test all that and more in the trial.

The wider policy context is that the UK now by law must be “net-zero” on carbon emissions by 2050, ending Britain’s long-standing and disproportionate contribution to climate change. Bath & NE Somerset Council declared climate emergency in May 2019, and is committed to carbon neutrality by 2030. B&NES commissioned some years ago two very pertinent reports. In 2010 CAMCO delivered the latest update of its report Renewable Energy and Planning Research. In 2011 Land Use Consultants delivered a report Landscape and Visual Issues for Areas with Technical Potential for Wind Energy Development in Bath and North East Somerset. The TL:DR is that Bath and surrounding areas are reasonably rich in wind resource (as any walker on the Kelston Roundhill could tell you), and that it’s a sensitive landscape (the reports mention Kelston Roundhill several times) with important sight lines, vulnerable wildlife and sites of special scientific interest. Wind is our biggest resource, but B&NES is not suitable for large scale wind farms.

B&NES Adopted Placemaking Plan sets out the existing framework (248pp); this is set to be superseded by a new Local Plan which takes over from 2020/1 (draft here: see p130 onwards for climate change related matters).

The 2010 CAMCO and 2011 LUC reports opine on the sensitivity of what they describe as large, medium sized and small wind resources. By this they mean

large (2.5MW, 135m to tip and 100m rotor diameter); medium (600kW, 61m to tip and 42m rotor diameter); and small (15kW, 25m to tip and 12m rotor diameter)

There is absolutely no way anyone is erecting such insanely massive wind turbines on Kelston Roundhill. It’s not even a controversy; we just wouldn’t think of them. But what the B&NES consultants are describing, remember, are turbines. What we’re going to trial is a prototype wind array. The maximum height is just 6m. These are better described as low-impact or modular; they are under a quarter the height of what B&NES’ consultants designate as “small”.

Kelston Roundhill is an iconic spot, visible from far away. It’s part of the skyline of the World Heritage City, clearly visible on any photo, painting or engraving made of Bath from the south west. It’s AONB and green belt. It’s sensitive, and we need to tread carefully towards a sensitive way to harvest renewable energy. It’s a good place to do the right thing. The wind speed is good (location is key, and Spinetic has been measuring it over the last year).

The trial prototype is 25m long by 6m high, and will be located along the hedge between Barn Ground and Seven Acres. There’s no public access there so if you want a close inspection or have any questions please contact us:

We’ll do an online consultation survey shortly (now launched: click here) after installation so all interested parties can express their views based on the reality an actual trial installation.

The frame prior to installation

Update: see gallery of images of the test installation here. 

The 6m high frame from the top of Barn Ground.


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12 Responses to Wind array trial due to start on Kelston Roundhill in July

  1. Rachel Jarai says:

    Many thanks, William, for keeping us all updated and for laying out the issues so clearly. Your post couldn’t be more timely, as it comes on the same day as the announcement that for the first time Britain is using more power from zero-carbon sources than from fossil fuels. The time to shift to alternative power sources is now.

    As an avid walker and visitor to the Roundhill, I will look forward to seeing the trial installation once it is in place.

    I hope that this is something that the local area will get on board with, and that the mini wind array will serve as a good reference point for similar small-scale installations within our landscape-sensitive AONB.

    • williamheath says:

      Thanks Rachel. It’s a step into the unknown, but at the same time a leap we have to take. We’ll learn a lot from having the trial. Key things are engaging local community and an evolving discussion with the Council against a reasonably fast changing policy background.

  2. Pingback: Wind array trial survey: please respond and share | Kelston Roundhill ________#LeaveNoTrace

  3. Chris Bunce says:

    What a great idea green energy I wish the owners all the best .

  4. Clive Shipley says:

    You can see from the photograph above , this highly reflective multi vane vertical wind turbine is in a commanding and dominating position positioned high above the villages and land to the west.
    it strobes reflected light into the valley below and is highly visible for miles.
    as well as being an eyesore and dominant in its surroundings it has the potential to cause epileptic fits in people who are sensitive to flashing lights.
    there is a place for”ECO” energy schemes but , a dominant position in what was an area of outstanding Natural Beauty, is not appropriate.

    • williamheath says:

      It’s a serious point; thank you. We evaluated this and one other location for a year before installing, and picked this location for the trial over the other because of subtler visual impact from the top of the roundhill (which has permissive path access). But we didn’t anticipate a flashing effect to the west in the setting sun.

      The vanes are indeed shiny. They’re brand new and would gradually dull over time, but we’ve asked the designers to test out some matt coatings which would be non-reflective. We’ve asked to trial a range of colours to see judge the effect. Addressing teething issues is the point of the trial.

      But your eplilepsy risk point may be more urgent. We’ll look into it. Happy to be pointed to any good source for expert guidance on that.

      • Brian Fisher says:

        Perhaps try some green paint? Surely turbines aren’t affected by the colour they are painted? As I sit in my kitchen today they might as well be 60 meters high as, being as reflective as they are, they are still an eyesore. Would it not have been a good idea to consult before installing it rather than let affected residents find out about them after the event?

      • williamheath says:

        Paint is a good idea, and we’ve this week installed new vanes which are powder-coated a deep matt grey. I expect that over next couple of weeks you’ll be proved right that it doesn’t affect performance. But it’s a prototype and these things are there to be tested.

      • williamheath says:

        We located it to minimise visibility from the paths at the top of Kelston Roundhill. Could I ask which parish you are seeing it from? We’re just doing accurate visual assessments from various points.

  5. Brian Fisher says:

    I live in Uplands Road, Saltford and, like many of my neighbours have been disturbed by the constant glare and flicker reflected from this array by the afternoon sun. I am disappointed that it would seem we, along with probably the rest of Saltford, were never consulted about this proposal and yet we are undoubtedly more adversely visually impacted by it than anyone else. Paint them green!

  6. williamheath says:

    Brian I’m sorry you’ve been disturbed by the prototype. Could I check: if the gantry were painted would you then be entirely content with the installation do you think?
    I’m in correspondence with Saltford Parish Council clerk about coming to a meeting soon. We ran a consultation Sept-Oct last year with 66 responses. Results are here:

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