A new arrival: the final piece of our renewable heating puzzle

by Dave Hood Engineering Department

With a mix of excitement and trepidation, I watched the 3½ tonne hot water storage tank get craned into place next to our new woodchip power station. Its job is to act as the thermal store – a big hot water storage tank – for the whole of our district heating scheme. This was the final piece of the puzzle the CAT engineering team had been waiting for.


Its importance is that we can now begin the final stage of connecting the new Combined Heat and Power (CHP) system up to the site district heating network and the new WISE building, and get all of the testing done in time for the winter heating season. This will draw to a close the design and installation stages of a project I have been working on for almost 3 years.


However, it does not stop there, as the installation is only one part of our site energy strategy. In September, I will start my doctorate research into biomass CHP, and its potential for community scale systems in the UK. Hopefully this will give others the opportunity to learn from the results of our experiments in this fledgling field of energy generation.

I tried to remember the importance of this, as the tank was lowered into place and set into its permanent home, ready for its connection, but a wry smile crept across my face every time I saw the big yellow crane and I remembered that engineers never really grow up!

You can watch a slide show the entire delivary of the new hot water storage tank by clicking the button below.


For help with flickr slideshows click here.

Measuring the footprint of the Dyfi Valley

by: Julie Bromilow Education Department

“I would thoroughly endorse the value of the learning experiences these pupils benefited from” said Jan Bond, External Subject Expert for Geography at the Welsh Assembly Government after visiting Machynlleth primary school to interview children about the Dyfi Footprint project they had just completed.


The Dyfi Footprint is a joint venture between CAT who work with schools, and Ecodyfi, who work within the local community. An Eco Footprint measures the amount of land that we use to produce the resources that we need, to deal with our waste and sequester our carbon, and tells us that if everyone in the world lived the same lifestyle we do in Wales then we’d need nearly three planets to support us. My work in the school was set to investigate the notion that the wider community can be reached through schools. The project mainly focused on an eight week programme with an enthusiastic year six class, but also included workshops for the school governors, all the teaching staff, the PTA, and members of the Eco Committee and School Council. The Year 6 work began with a planning session with Mr Jones the class teacher – I told him what I wanted to do, and he told me what targets needed to be met in all the core subjects. Incorporating these curriculum needs into the project made sure that it was never an ‘add-on’ – instead it was integrated into the teaching.

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Feeling sheepish at the Plaid Cymru sustainability conference

by: Peter Harper

In April I spoke at the Plaid Cyrmu Conference on Sustainability. I was keen to raise a few issues that I knew would be controversial. Although Plaid now share power in the Welsh Assembly Government their members appear to have retained the ability to speak their minds and engage in intelligent debate.

On these occasions, given any sort of platform, I always raise the question of livestock because otherwise it’s ignored. Sheep and cows are net greenhouse-gas emitters and could not survive a systematic decarbonisation programme in anything like their present numbers. Reduced to say 10-20%, the huge areas of land they presently occupy would become available for other purposes in the new carbon-economy. I never have time to present the caveats and nuances, and it tends to come over a bit simplistic. Perhaps you need that in a public debate, but naturally this kind of sentiment does not go down well with stock farmers, well represented in a Plaid Cymru whose voter base is largely rural Wales (nor with Patrick Holden of the Soil Association, who was sat next to me on the panel!).  But I was not lynched; on the contrary the discourse was polite and reflective. The most telling point made against me was that if we restricted meat production in Britain, in a market system it would simply be bought from abroad. Quite true, unless the ‘drivers’ for decarbonisation are internationally agreed and enforced, as they would have to be. It reminded me that we are still a long way from a proper global decarbonisation plan, and it’s very difficult for small countries to go it alone.

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Values for money: rethinking the food system. Interview with Professor Tim Lang

By Peter Harper

Few people know more about food than Professor Tim Lang. I put some questions to him for Clean Slate magazine

Tim Lang

PH: One of your most influential books has been Food Wars. Why ‘Food Wars’?
TL: You have to go back to the period just after the Second World War when memories of food shortages and supply disruptions caused acute anxiety. There was wide agreement worldwide that we just had to have much more, and much cheaper, food. It was accepted that the state should take the lead and promote investments in agricultural technology. In the book we called this approach ‘productionism’ to emphasise how, across the food supply chain, there was unity about the need to increase production and remove blockages everywhere. In its own terms, productionism worked. More food was produced; shelves groaned with choice; prices dropped. UK households now spend less than 10% of their income on food, compared with 25% in 1950. A hiccup occurred in the early 1970s with an oil crisis (sound familiar?) but then productionism was saved by the Green Revolution, a combination of agrichemicals and new plant breeding which boosted output. This turned food-poor countries like India into net exporters. So faith in productionism was and is all very understandable, given how the problem was couched: a lack of food. But even as productionism appeared to be succeeding, its downsides gradually started to dawn on us all: the accumulating environmental damage; the health effects of over- and mal- consumption; the almost total dependence on oil; and the unbalanced diets and warping of food culture.

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The Education Department

by Jo Gwillim Education Department

I’m Jo – part of education team at CAT. There’s 7 of us in all looking after different aspects, running the residential eco cabins, organising schools that visit for the day, running activities for pupils, students, and teachers. Where? Mostly here but more and more we spread the “Education for Sustainable Development” message by going out to people as well as waiting for them to come to us.


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Eel murder mystery

By: Lewis Winks Biology Department

On my office floor in a cardboard box is nearly half a metre of fresh eel, found dead near to our fish pond. The mystery of our guests’ presence here has caused quite a stir today- both staff and visitors peering down in curiosity at the leathery corpse. Its dull grey appearance catching the light is anything but ordinary as we dwell on how it would twist its way through the cold water, occasionally moving over land in wet weather- preferring to migrate on moonless stormy nights.

Eels had factored very little on my biodiversity radar until today when I decided it would be worth doing some research into their biology and habitat. It didn’t take long until I had pinned this particular individual to a species – ‘Anguilla anguilla’ or the European common eel. Don’t be fooled; this fellow is anything but common, especially gnawed in half and discarded next to a lake in mid-Wales. In fact these eels are now in steady decline and appear as critically endangered on the IUCN Red List, the reasons for which remain unclear- although it is speculated that damage to habitat, overfishing and global warming might be contributing factors.

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Doomsday, whatever

By: Julie Bromilow Education Department

As might be expected, the Plymouth delegates were taken on an emotional roller coaster, and were sent spinning through the dizzy heights of strangely familiar Education for Sustainable Development emotions; angst and optimism, flirting giddily on the precipice of relief before plummeting into the valleys of grief.


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PHOTOS: a week with the engineers

The Centre for Alternative Technology’s engineers are responsible for all the renewable energy systems on site including our wind, hydro, solar and biomass equipment. This series of photos shows a week with the engineers in which they carry out maintenence on one our wind turbines and install solar water heating on the roof of the eco cabins.