Secret Scotland

If it's secret, and in Scotland…

Life on Muck – almost a modern electrical fable

Solar cell sun

It was fascinating to read the reality of life on the tiny island of Muck, which has just moved into the world of 24-hour mains electricity supply.

Previously, the islanders (numbering 38 at the time of writing) were limited to a schedule, determined by the fuel supply of the island’s diesel generators which first provided electricity in 1970, but could only provide power for 14 hours a day, from 11 am to 5 pm, and 11:30 pm to 7 :30 am. The population has fallen over the years, having peaked around 300 at the start of the 20th century.

This meant using candles or tilley lamps similar for lighting, missing the end of films, and problems with food stored in fridges and refrigerators, with the island’s tearoom having to organise things to make sure provisions were safely stored. The island’s generator was only rated at 10 kW, which meant that users had to arrange schedules for using appliances such as washing machines that drew large amounts of power when operating.

There’s a fair few outright lies being circulated by supporters of Donald Trump, posting comments after articles critical of the Dump to the effect that wind power doesn’t work, but Muck is benefiting from developments in this area (albeit I am not suggesting the island has suddenly grown a giant wind farm), and its new supply is built around a new installation combining six 5 kW wind turbines with a 30 kW solar panel installation.

Muck joins Eigg, where residents now get more than 90% of their electricity from hydro, solar and wind schemes, and micro hydro-electric schemes, wind turbines and photo-voltaic cells saw the Isle of Eigg Heritage Trust named overall UK winner in the Ashden Awards for Sustainable Energy for 2011.

The new supply was made possible when Muck Community Enterprise Company received a grant of £978,840 last year,  to help introduce the system of wind turbines and solar panels.

The lack of a continuous electricity supply limited the opportunities for business and growth on the island, but the new supply is hoped to improve this, so the tearoom, hotel, and two B&Bs on the island should benefit from increased numbers of visitors who can also be better catered for.

Muck tearoom 2006

Tea Room area – © Dr Julian Paren via geograph

The selected pic actually shows the parking area for the Tea Room, which is not  actually visible, and lies just off to the left in this view. It’s worth noting that there are no cars on Muck, and visitors get around on bicycles, or by tractor. (Our thanks to the photographer.)

I have to admit to being a little intrigued by the mix of renewables as used on Muck: 5 kW of wind plus 30 kW of solar. Considering the usual image of weather conjured up by thoughts of Scottish islands, and having been on one or two myself, I’d have thought the lion’s share would have gone to wind, with solar acting as the backup.

It will be interesting to see if there is a later story, reporting a change, or if this initial division proves to have been correct.

See Muck switches to 24-hour power supply for first time

And Muck celebrates as it gets electricity 24 hours a day for first time | Highlands & Islands | News | STV

Also Muck gets 24hr electricity supply for first time – Heritage – Scotsman.com

March 30, 2013 Posted by | Civilian | , , , , | 1 Comment

Renewables bob back up in the news

The various renewable power generation schemes seemed to have gone a little quiet in the news, which was handy after I decided to stop following them as I was afraid of becoming stuck in some sort of pro or anti crusade, rather than just being interested.

From comments received, it seem that if you disagree with claims about any particular system you are quickly targeted by its fans, and seen as some sort of heretic, while if you offer positive remarks, others will consider you as some kind of nut – or green loony.

Still, the past week has been interesting…

Wave Power

Vagr Artfed wave power generatorStarting in Scotland, the Vagr Atferd generator has just been completed and launched in Leith, where it was produced by local firm Pelamis Wave Power (PWP) for the German energy giant E.On. It will travel to Orkney, where it will be tested for three years to prepare it for commercial use.

180 metres long, it weighs 1,500 tonnes and can produce up to 750 kW of electricity.

Launch picture courtesy of the Scottish Government web site.

Solar Power

Next, is the possibly surprising story that proposals for a £40 million network of solar farms are to be the subject of a public consultation. This will look at plans for a 15-acre “energy farm” on a green-field site at St Kew, three miles east of Wadebridge, which acts as the gateway to north Cornwall’s popular tourist heartlands. A local farmer has raised £4.5 million of private investment to construct the first of what could be ten similar sites across Cornwall and the Isles of Scilly, which, if all built, would triple the UK’s current solar generating capacity.

I sense an alarm bell ringing about the seriousness of this proposal, not because of the viability or otherwise of solar power – I’ve lived down on the south coast of England during summer and winter, and the difference between Central Scotland and the south coast is stunning, no wonder the oldies go and retire there. Even in the height of (a normal) winter, you can find there is no real need for heating – at least if you are a Scot used to freezing in Glasgow during (a normal) winter.

What I actually found of concern was the proposer’s statement to the effect that, “To reduce costs, R-ECO says it is cheaper to employ five staff to manually adjust the panels so they face towards the sun as it moves across the sky than install automated tilting mechanisms.”

Five staff at average wages would cost about £125,000 per annum, just to carry out an inefficient manual adjustment of the solar panels. Inefficient because they would only be able to optimise the panels at intervals, presumably when they did their rounds, and not continuously as would be the case of an automated system. I can think of two different control system that could be used to control cheap servos, and these are priced in the hundred of pound per system, rather than thousands. Costs could be further reduced by having one controller control banks of panels, meaning only the servos need to be duplicated.

Update

As I thought, there is no problem in automating the sun-tracking process, and gaining a considerable efficiency increase as a result. This site offers one way of achieving this, which could be constructed more professionally, and still be cheaper than the annual cost of employing five staff to do this by hand.

I think the people in Cornwall need to employ some smarter planners, if they are serious.

Britain described as the ‘Saudi Arabia of renewable energy’

I suspect that the articles suggesting Britain could be the ‘Saudi Arabia of renewable energy’ might be better entitled if the word ‘Britain’ was replaced by ‘Scotland’, as most of the reports I’ve spotted have tended to concentrate on the North Sea, and the power that could be collected there. But to be fair, the bigger picture does draw on power that could be collected from further afield.

My own opinion of these claims is to side with the sceptics, as although the report was produced by an independent group, it was sponsored by Department of Energy and Climate Change, the Scottish government and the Crown Estate as well as companies including Scottish and Southern Energy, E.ON and wind turbine manufacturer, Vestas.

This is not to imply that there is anything particularly underhand, rather that it will be biased to report the most favourable options, and minimise or ignore those that are not advantageous to the sponsors. Although I haven’t noted any particular article or report, a look around the web nowadays will find publications which suggest that the promised return from wind farms are failing to meet promised made, as the wind has failed to blow to the extent that initial applications claimed it would. In light of this real world ‘revelation’, the following quote from the study just sounds to good be true, and perhaps the cost of achieving what is stated would be impractical:

The study, undertaken by the Boston Consulting Group, suggests that Britain could not only keep the lights on but would produce a surplus, suggesting the need for connections to a “super grid” to enable electricity to be exported via subsea cables. It predicts that using even 29% of the available resources, Britain could save 1.1bn tonnes of carbon dioxide between now and the middle the century.

I think the closing remark is much more reasonable, and contains the necessary warning about net getting too carried away by promises of Britain becoming the Saudi Arabia of renewables:

There was caution among financial analysts such as Dean Cooper, head of clean tech at Ambrian Resources. He said: “We see the report as providing compelling sizing information to value the offshore resource, but equally it highlights the herculean scale of efforts needed to achieve the numbers outlined. To reach 78GW will require a build rate of 2.8GW per annum by 2050, which is equivalent to more than two 5MW turbines every day. This compares to the equivalent of one 5MW turbine installed every two weeks for the installed stock of offshore wind in the UK today. Offshore wind will be an important element in the UK’s energy mix to keep the lights on, yet the gaps in supply chain, grid and planning to achieve this are monumental. There is money to be made in offshore wind as a structural growth trend, but when?”

This sounds much more like a statement made in the real world where such projects have to be funded by real money, attract real investment, and work in real time, not some impossible or impractically short timescale that suits a soundbite made for the benefit of the media, or political expediency.

Think back to the first article I mentioned above, where new technology for collecting wave power is not even going to become operational for at least three years, as it is going to take that long merely to test its practicality in the sea. If anything goes wrong and it falls apart, the technology could take many more years to refine and make practical, and the way some investors work, it could simply be scuttled and abandoned if it does fail under test, and no-one is prepared to invest further.

May 23, 2010 Posted by | Civilian | , , , | 4 Comments

   

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