OK The Problem
We all know that the UK needs to reduce it’s carbon emissions and beyond that the whole world needs to. In the grand scheme of things the UK is but a drop in the ocean when it comes to population, energy production and therefore carbon. If we became a carbon neutral country it will be fabulous but if other countries with greater populations and flourishing economies do not see things the same then we are indeed screwed, no pressure!
Sooooo….83% of global CO2 emissions are from energy production. Of this energy 82 % is generated from fossil fuels. The top 10 emitting countries emit 2/3rds of the world CO2 emissions, these being:
China
US
Russia
India
Japan
Germany
Canada
UK
Korea
Iran
But this is all skewed because of population. The US has 5% of Worlds population but emitted 20% of CO2 in 2007, conversely India has 17% World population and emitted 5% of the CO2. (International Energy Council)
So yes, indeed we need to sort this out globally.The UK is supposedly cutting emission by 20% by 2010, (that’s next year!!) 34% by 2020 and 60% by 2050. The latter two targets are legally binding with the government of the day supposedly being taken to court if we don’t reach them, (yeah right!!). Anyway, I’m getting side tracked. We need to reduce emissions and the aim of this blog is to suggest some of the lesser known alternatives. Not for big scale production but I think people need to take more responsibility for the amount of energy they consume which should involve lots of smaller scale stuff, (microgenration)to reduce the demand on the grid. This is especially important with growing population and greater demand generally caused by the increase in popularity of the electric car, (I’m just guessing that will happen). And I just want to talk about some newer bigger scale stuff too.
Righty dokey…
First Geothermal, not a very ‘alternative’ alternative I know but in the UK I think it could be regarded as being a little out of the ordinary. I remember hearing about geothermal power in Cornwall when I was first at uni, (the first time around) . Basically the rocks under parts of Cornwall have a steep thermocline, (they get hot quickly just below the surface). Anyway, it looks like things have moved on a bit and Eden Projectwant to install some geothermal to power the domes and 4,000 homes. This will involve drilling two 4,000m, (yes that’s 4km) wells to get to the hot rocks. Not as naturally occurring as the old Iceland geothermal but well done all the same. This would be good as a community based scheme I imagine.
Wave power, not to be confused with tidal power. The action of waves is used to turn turbines in various guises. I wrote a paper on this freaking years ago so was very interested to see how things have progressed. Pelarmis is the major addition made by the Scottish company Pelarmis I mentioned in my previous blog. Pelarmis is a long hinged thing and as it moves up and down in the waves it’s hinges bend pumping hydraulic fluid into it’s turbines. Pelarmis now have a commercial wave power station in Portugal called Agucadoura Wave Park , 3 snakes make enough power (2.25 MW) for 1,500 homes. There are lots of smaller scale wave power jobbies such as the duck and the LIMPET which I wrote about in the aforementioned paper , I’ll comeback and finish this off in the next few days as i would love to see if things actually have progressed.
Ahh now small-scale hydropower which encompasses Pico, Micro and Mini. Pico refers to tiny tiny schemes generating less than 5kW which isn’t really enough to run a modern day house. Pico hydropower has quite a following, it is quite an effort to go to produce such a small amount of electricity but go for it guys. It is very important in some rural developing areas, (I should put a reference here but I actually do just know this shit) where instead of hydro turbines waterwheels are used, (yes she had to get to in somewhere). Now a UK charity makes a low cost efficient waterwheel called a Pedley Wheel. Now not meaning to blow my own trumpet but, Spencer (2006) did a study into the feasibility of using old watermill sites in the UK for the production of electricity. I focussed on very small scale stuff and developed a methodology for assessing whether a site would be feasible or not. I’m not going to link to it as I think Cranfield actually own the rights to it, (I won’t vent my anger here at that, actually I shall email Cranfield and ask if I can link to it). But let’s just say some of the larger sites really are feasible especially if newer more efficient water wheels are installed. It should be made easier for such installations to take place especially where in-river schemes are proposed.
Just for Spex.. the solar chimney, I believe this would only really be feasible in hot countries. Basically a big chimney is built in a hot area, air is sucked in and warmed up in a kind of greenhouse at the bottom of the chimney, it rises up the chimney dragging in more air at the bottom and turning the turbines. Another dude has proposed the Solar Nozzle, (tee hee I said nozzle) which sort of works the same but instead of a chimney a cylinder with a wide base and narrow top is proposed, this works the same but the air rises quicker due to the narrowing. Ok not at all feasible in soggy old Blighty and they supposedly aren’t particularly efficient anyway. But as small scale producers in very hot countries it may in fact work. The Botswanan government is thinking about giving permission for the first ever commercial solar chimney power plant
Currently Botswana only has 1 coal fired power station producing 132 MW of electricity, the rest of their energy is purchased from South Africa. The Botswanans have discovered that there one and only power station does not really operate very efficiently at high summer temperatures so have decided to take complete advantage of what their country has to offer, this being high temperatures and 70% of the country being taken up by the Kalahari desert. So they have plenty of room, high temperatures and little history in a particular type of energy production, they have therefore ploughed loads of dosh into research. It’s almost a fresh faced innocence that I think should be applauded. They have taken advantage of what their country has to offer and very much seized the day. I think we could learn a thing or two as we are an island with over 19,000 miles of coast when the bigger isles are included; and also an estuary with the second highest tidal range in the world you’d think we really would be able to harness tidal or wave power to some degree. I know the tidal barrage is controversial but really if there is no freaking salt marshes left because of rising sea levels what on Earth have we actually achieved by not letting the barrage go ahead. I wrote ages ago about a scheme called ECOSTAR that could possibly generate 25% of the UKs demand for electricity!!
But what about using these of ordinary chimneys and cooling towers…., as the air isn’t be constantly replaced at the bottom the chimney and therefore not a great deal of pressure will be generated I’m not sure this will be enough to turn a turbine with an electric motor attached although i will do some more research I promise.
I’ve done a tad more research and I can’t find any info on using normal chimneys I’m afraid Spex. It would seem if it could be used then it would have been by now. I did however find all that stuff on Botswana that I have just added to my dear little blog.
Once again that is enough but I will add more about wave power soon.









