Table for one

INCPEN, The Industry Council for Packaging and the Environment, have produced a super leaflet called Table for one. It is a detailed document full of numbers estimating the energy footprint of one typical British person's food.
All the numbers are expressed in MJ per week. There's lots of nice diagrams, some showing the breakdown of the energy footprint of, say "Snacks" between food supply, primary packaging, transport packaging, transport from factory, retailing, travel to shops, home storage, and home cooking; and some showing summary numbers.
The one below summarises how much energy the average person gets from all their food (73 MJ/week (2.9 kWh/d)), how much it costs to produce and deliver it (337 MJ/week (13.4 kWh/d)) and how much energy is used to produce the packaging (35 MJ/week (1.4 kWh/d)).

The final figure below shows the breakdown of the footprint by food type, and there is a clear message about meat consumption (as I guessed in my book): meat has a bigger energy footprint than any other foodstuff. [They were assuming that the average person gets 7 MJ per week (1,700 calories per week, or 242 cal per day) of energy from meat; this is a weight of 1029 g per week (147 g per day). For comparison in Ch 13 I assumed a carnivore ate 227 g per day.]

It's nice to see an industry publishing such clear energy-footprint numbers! A copy of "Table for one" (pdf) is sitting on my website. I assume INCPEN don't mind my sharing it there.

Moon, and Age of Stupid

This post is fairly off-topic for a sustainable-energy blog, as it is a review of a film that I enjoyed, and would like to recommend. Moon is a film about the life of a man, Sam, working for the biggest eco-energy company, mining helium-3 on the moon.
I am happy that all I knew about this film was that "Sam was lonely on the moon". The only review I read was Roger Ebert's, and he (good for him!) didn't spoil the movie by revealing its plot.
I recommend that you read no reviews of the film (apart from Ebert's), and don't even watch trailers for this film. Even looking at the strap-line on a poster for the movie may reveal more about the movie than you really want to know.
To make this post increasingly on-topic, I'd also like to recommend Age of Stupid. I wrote a review of it after seeing its UK premiere, of which I quote the opening paragraph here.
"The Age of Stupid" is a splendid film. Here's what sets it apart. Whereas many documentaries interview each subject briefly, on a single topic, "Stupid" slowly unveils each character and their web of relationships. The principal characters are real people, whose life-stories relate to the topics of climate change, energy policy and consumerism in multiple fascinating ways.
Both are great films, thoughtful, with twists, and thought-provoking.

Where the wild things are

In SEWTHA, I included, as a joke, a map titled "Where the wild things are". The map shows in white the areas within 2km of human habitation (and thus of course excluded from wind farm development). It shows in black the areas that are more than 2km away from human habitation; these areas are thus tranquil, and also inappropriate places for wind farms. Wind farm development is to be encouraged in all other areas on the map.
Some readers have failed to understand my joke; that amuses me.
What's even funnier is the map produced by the RSPB, "to ease conflict between wind farms and wildlife" (October 2006).
This image shows their map, and the painfully funny thing is how similar its message is to my joke-map's. Almost every good location for wind in Scotland is excluded! - Almost all the islands are given a "sensitivity rating" of "4 high" (the maximum), with the exception of the single island of Jura, which is mainly judged "medium"; most of the highlands are also "high sensitivity". The only really promising locations for wind that squeak through below "medium sensitivity" are the Mull of Kintyre and the southern coast from Glasgow to Stranraer.
How is this map meant to relate to last week's RSPB announcement that the Renewable revolution is overdue?

Two exciting things (DII and DWFTTW)

The first thing I got excited about recently is the news announcement that roughly 20 big German companies are talking about investing €400 billion in the Desertec Industrial Initiative. What is thrilling about this announcement is that it involves a sum of money that is in the right ballpark for a genuine plan to get off fossil fuels. So often, government announcements have involved 1 million here, 10 million there, and (rarely) 100 million. I reckon the cost of putting together a new energy system for the UK must be roughly 400 billion pounds, or 10 billion pounds per year from today to 2050. This is much more than millions; but it is still perfectly affordable, given that we already spend 80+ billion per year on energy and 80+ billion per year on insurance. I'd love to see details of what the German companies think they could buy for their 400 billion euro.
The second exciting thing was to discover, thanks to James from Isentropic, what I now consider to be the two best videos on ther internet. Namely: Downwind Faster than the Wind (DWFTTW) [which demonstrates that it is possible to make a wind-powered vehicle that goes directly downwind faster than the wind] and Under the ruler faster than the ruler [which explains with a nice simple model how faster-than-wind travel works].
What intrigues me philosophically about the wind-powered-travel expositions is that it reveals how fragile and weak "understanding" can be: I thought I understood wind-powered travel, and I already knew about wind-powered vessels that can sail directly upwind (eg, Revelation II, pictured). But I got the answer to the question "is DWFTTW possible?" wrong! - even though the principle by which upwind travel works is just the same as the principle of DWFTTW travel. So it seems that when I "understood" upwind travel, what I really did was append to my stack of physics heuristics another heuristic, permitting upwind travel; I didn't add a piece of knowledge that was capable of working in new situations.

RouteRANK

RouteRANK provides a journey-costing service, which tells you all the different ways of getting from A to B, how long it will take, how much it will cost, and how many kilograms of CO₂ will be emitted. For any A and B in Europe. The image below shows the results for a "Cambridge to Edinburgh" query. Cute! I wish it displayed "energy used" too.

Most inaccurate numbers in a right-wing newspaper - Hot Air Oscars

Well well! Ed Miliband's announcement of the government's energy road-map has given rise to a remarkable pair of nominations for the Hot Air Oscar for inaccurate numbers in a right-wing newspaper. What's remarkable is that both pieces of poor journalism, in the right-wing press, make assertions about wind power that spin erroneously in favour of wind power!

Nomination 1

The Daily Mail says Research by the University of Southampton has found that a well-placed turbine could make enough energy to power 825,000 homes a year.
Hahahahaha! As usual, the units are wrong. [They should either say "One turbine" could power "X homes" (no "a year"), or "one turbine could make enough energy in a year to power X homes for a year". Why can't people get units right?] But the inaccuracy of "X" is the funniest thing. Realistically, a typical 2MW turbine with a load factor of 27% will produce 0.54MW on average, which, using the standard definition of "a home" (see p 329 for my rant on that topic) means that it can power 1000 "homes", on average. I think a better way to visualize the impact of one such turbine is to say that its output is equal to the total energy footprint (including transport and heating and electricity) of roughly 100 UK people.

Nomination 2

The Daily Telegraph has twice propagated another piece of twaddle concerning the area required for wind farms to provide "all Britain's energy consumption". First there is a letter from Anthony Ridge-Newman, Royal Holloway University of London, published Sept 2008, which says "The most startling thing is that scientists estimate all of Britain's energy can be supplied by an offshore wind area as small as 70 square miles", and that "Britain could be producing enough energy from wind to begin exporting to Europe within 10 years." "Startling" - yes indeed! You'd think you'd be sufficiently startled to check your numbers before writing to a national newspaper! And you'd think the newspaper might check the numbers sent in by its startled correspondents before wasting ink on publishing them. But no. The Torygraph has actually printed this "startling" (and false) meme a second time, this time in an "Analysis" piece authored by "Dave Andrews, head of the Claverton Group", published on 16th July 2009. He writes of onshore wind that "it needs an area of only 70 square miles to generate Britain's total power requirements". Crikey. Did the copy-editor do this to make the Claverton Group look like a bunch of fools? Apparently so, yes! - The Claverton site says the article as submitted said "a 70-mile by 70-mile square". Yes, that would be 70 times more accurate! For the record, (see my survey of UK wind farms if you want, where I show that UK wind farms, whether onshore or offshore, generate roughly 2.5 watts per square metre, on average), 4900 square miles of windfarms would generate about 32 GW on average, which is close to Britain's average electricity consumption (it's about 42 GW). If you want to produce "all Britain's energy consumption today" (ie transport and heating too) then you need about nine times the area, since Britain's primary energy consumption is about 300 GW.
The bottom line - the Daily Mail article is off by a factor of 825, and the Telegraph's rendition of Clavertonism is off by a factor of 70 or 630, depending on whether you allow energy to be confused with electricity. It's a close battle for these awards!
Keep sending in nominations.

Acknowledgements

I thank Christopher Booker for pointing out these two "lunatic" articles. Booker coyly didn't name the two newspapers responsible for propagating the twaddle.

Sustainable Energy Pirates

I'm upset to discover that some criminal types have gone to considerable lengths to make and sell fake paperback versions of Sustainable Energy - without the hot air on amazon marketplace. [Photo above shows a pirate copy (left) alongside a genuine paperback copy of the book (right).]

This page shows photographs of an example pirate paperback alongside genuine paperbacks. If you bought SEWTHA from amazon marketplace, please check your copy. If it looks awful, maybe it's a pirate copy. (Some reviewers seemed to think that the genuine book looks awful too!) The genuine books look professionally produced and are on good quality paper. To check whether your book is a pirate, please look at the photos. If anyone has been sold one of these fakes, we urge you please to (a) ask amazon for your money back; (b) complain to amazon about the 'marketplace' criminals. Thank you!

Sustainable Energy news

SEWTHA was published in the USA on May 1st. Last week, it was reviewed in Science magazine, and now some people who like SEWTHA have written a submission to slashdot "Solving the Energy Crisis by Tripling Electricity".
If you like this article and have a slashdot account, please click on the "+" button to help the article get promoted.
And finally, the third printing of SEWTHA has just come out, and it has got a NEW COVER (shown above). My publisher and I are very democratic about these things, and when the Guardian's Leo Hickman opened his review with the words "It has a crashingly dull cover and title", we were happy to respond to feedback. We hope you like the new cover! [full size image]
The third printing brings the number of copies printed to 30,000.

Visualizing wind farms for Cambridge University

I thought it would be a fun exercise to see, on a map, whether we could imagine powering the University of Cambridge from local wind turbines. The University's average electricity consumption is 11.4 MW, and its gas and oil consumption is 8.7 MW. (That's the University departments and offices only, not the colleges.) If we switched our heating over to heat pumps and insulated all the buildings, maybe the total consumption could be covered by 16 MW of electricity. Probably about 72 MW of wind capacity would be required to produce 16 MW on average. That's about 36 big wind turbines of the standard 2-MW size in the photo above, which shows Red Tile wind farm.
This web page contains my notes and the map, which is reproduced below. [Please click on the map to see the whole thing.]

The left side of the map shows West Cambridge, with locations for wind turbines shown by the green and red circles. Exclusion zones are indicated by blue circles. I've assumed that turbines could be put alongside the motorway and that motorway noise would dwarf the turbine noise, so that smaller exclusion zones are appropriate near motorways.
The right hand side of the map shows the Red Tile wind farm to the same scale.
I don't know who owns any of this land, nor have I done any wind surveys, so no-one should take this map seriously.
It would cost roughly £70 million to put up these turbines.
If people don't like the idea of having iconic wind turbines ruining the tranquility of the M11, another option would be for the University to buy a 1.6% share of a new nuclear power station. That might cost £32 million or so.

The one-percent rule, leading to patriotic thoughts about the Falklands

I wrote an article for the Guardian. I called it "The one-percent rule". They called it "Talk of 'kinetic energy plates' is a total waste of energy".

Here's the article I wrote.

I'd like to suggest a one-percent rule for news-articles about energy-saving gadgets or renewable energy systems. The rule says "a gizmo may be discussed only if it could lead to energy savings of at least 1%". I suggest this rule not because minnow-sized savings are
worthless, but because the public conversation about energy surely deserves to be focussed on bigger fish.

The latest piece of green twaddle that's wasting people's attention is
the story (15 June 09) about a new supermarket carpark that has "kinetic road plates" creating "green energy" from the motion of customers' cars.

I'm not saying that these systems don't actually work; perhaps they do save a little bit of energy that would otherwise be wasted in the brakes of the cars arriving in the carpark. But my suggestion is that these systems save so little energy, we shouldn't waste newspaper space on such stories. There must be more important things to discuss (assuming we are serious about getting off fossil fuels).

To prove my point, let's compare the energy that might be saved by the "kinetic road plates" with the total energy used by a typical trip to the supermarket. Let's guess that the kinetic road plates extract one fifth of the kinetic energy of the arriving car. For a car
weighing one ton travelling at 20 miles per hour when it hits the road plates, the extracted energy comes to 0.002 kilowatt-hours (kWh). Now, the energy used by the car, assuming it is driven 3 miles to and 3 miles from the supermarket with a fuel efficiency of 33 miles per
gallon, is about 8 kWh. The savings from parking at the green carpark thus amount to one four-thousandth of the energy used by the trip to the supermarket.

That's much less than one percent. So this "green energy system" is just eco-bling, creating a delusion of happy progress while distracting people from serious change.

What are some ideas that satisfy the one-percent rule? Well, there's lots of examples: a domestic solar hot-water panel will generate roughly 4 kWh per day of hot water, which is roughly 50% of a typical family's hot water consumption, and a bit more than 1% of their total
energy footprint. Example two: wind power - a ten-fold increase in Britain's wind turbines would produce on average 4 kWh per day per person, which is about 4% of our total energy footprint.

So solar panels and wind turbines deserve to be on the public's radar. Of course, solar panels and wind turbines are old news. So let me close by suggesting a new topic of conversation that also satisfies the one-percent rule.

When we are planning wind-farms, it makes sense to put them up first in the windiest spots, where the hardware will give the biggest return. So let's talk about wind-farms in the Falklands.

Mean wind speeds in the British overseas territory of the Falkland Islands are 9-11 metres per second, compared with 6-9 metres per second around the British Isles. 1250 3-megawatt turbines in the Falklands would probably produce an average power of 2.5 GW (or 1 kWh per day for every one of the Queen's 60 million subjects). That's roughly 1% of the total energy footprint of the United Kingdom.

Are there any problems with this idea? Well, first, as usual, the wind farms "would spoil the view". There's no free lunch. Serious renewable power requires industrial facilities in the countryside; the point of proposing wind-farms in the Falklands is to reduce the area of countryside "spoiled". The total area of the Falklands is a bit more than half of Wales; the area occupied by 1250 windmills would be about one twelfth of the Falklands. Sheep could, of course, still safely graze among the turbines.

Second, the average power produced by these windmills would probably exceed the electricity demand of the three thousand inhabitants of the Falklands, so we'd need to find other ways of using the power. A traditional way of handling the problem of excess electricity is to
produce aluminium. Iceland and Norway, for example, produce 1% and 4% of the world's aluminium respectively. The Falklands wind-farm sketched above could produce 1.5 million tons of aluminium per year - 5% of world aluminium production. Aluminium is just one example of
a storable product; the electricity could be used to make other energy-intensive materials such as magnesium and cement.

Notes
Mean wind speeds are given at a height of 50m.
Source: http://www.gaisma.com/en/location/port-stanley.html
http://www.gaisma.com/en/location/grytviken.html
I assumed the load factor of turbines in the Falklands would be 66%.

Addendum, in response to the flood of comments on the Grauniad site
Thanks for the feedback! (1) To the Falkland-wind-critics who point out that Aluminium production needs steady power... Yes, I'm aware of that; I thought of saying so in the article, but decided brevity was a virtue. What I would have added is "to smooth out the wind fluctuations, we could create pumped storage systems, or other energy storage systems, just like the four pumped storage systems in the UK (which were built mainly to help match inflexible nuclear supply to fluctuating demand). This would bump up the cost a little.
(2) As for the energy-cost of shipping materials to and from the Falklands, this is one of the striking things I learned when writing Sustainable Energy - without the hot air: those monster ships are amazingly efficient at transporting stuff - far more efficient than trucks. (Read about it on page 91.) I'm not saying that Falkland-wind is definitely a good plan - just that you need to check the numbers before knocking a plan simply for using international shipping.
(3) And finally, to the people who insist in enjoying the delusion that the power harnassed by these silly ramps would be significant if only I compared it with the power consumed by the supermarket instead of with the power consumed by the trip to the supermarket: no. Work out the numbers! Here is a rough stab at the calculation: As you can read on page 93, UK supermarkets consume 0.5 kWh per day per person. If every person visits their favourite supermarket once per 7 days, then their supermarket is consuming 3.5 kWh per personal visit. If the silly ramps manage (as estimated above) to provide 0.002 kWh per arriving car, then the silly ramps are covering less than one thousandth of the energy consumption of the supermarket. Cut the twaddle. These things are eco-bling, whichever way you look at them. All you need, to see this, are simple numbers. [The Falklands idea may turn out to be a bad idea too, but I hope people find it fun to think about.] David MacKay, Cambridge.

How much can one drinks bottle achieve?

I'd like to nominate the belu bottle of natural mineral water for the Hot Air Oscar for the greatest ecological achievements by a 500-ml beverage container.
It's an incredibly long list, spanning the whole ecosystem. On the front of the bottle there are icebergs and a penguin. On the back, a field full of flowers and butterflies.

The bottle's achievements, in more detail:

1. It's the UK's first compostable bottle.
   
2. They can be composted back to soil in only 8 weeks - a million times faster than plastic bottles!!
   
   
3. Every bottle you buy provides clean water for one person for one month
   
4. It's the first bottled water that does not contribute to global warming
   
5. It is penguin approved
   
6. All profits go to clean water projects
   

Surely it is an honour simply to stand in the presence of such a vessel.

Hot Air Oscars nomination: Easy Being Green

A nomination for most inspirational fluff on a bottle goes to Avra, Greek water manufacturers.
"It's so easy being green" ...on a plastic water bottle, in a country where the tap water is perfectly drinkable.
[From flickr, thanks to jinty for the nomination.]

Corrections and clarifications (Wind, Whitelee, Wales...)

Perhaps I need to stop doing media interviews...
I wrote some notes about Whitelee recently. Last weekend, the BBC asked me to record some comments in advance of the official Whitelee switch-on. My comments focussed on the scale of renewables required to really make a substantial contribution to British energy consumption. Unfortunately my comments may have been misinterpreted - partly because I wasn't actually sure what I was being asked! The interview was recorded by a nice subcontracted interviewer who had been fed the 3 questions to ask me. The first question was "are the government's targets achievable?" ... with no indication of what targets the question referred to. The child poverty targets? "No more boom and bust"?
I answered the question assuming we were discussing long term climate targets. In one take I referred to "the government target of a complete decarbonisation of our electricity supply system by 2030." This was an error, as the government hasn't adopted that target (yet); it is the Committee on Climate Change that has indicated that they think almost-complete decarbonization of electricity by 2030 is essential.
As I have discussed in this article, if the UK is to get off fossil fuels, we need to be talking about big efficiency measures, probably lots of electrification of transport and heating, and big growth of 'green' electricity sources - for example, something along the lines of windfarms with size similar to the area of Wales, and a five-fold increase in nuclear power. Each of these two sources would deliver roughly 20 kWh per day per person.
Do I think Whitelee is a figleaf? Not at all. It's awesome, and it does generate real power, on average - enough to power hundreds of thousands of electric vehicles, for example - though not quite enough to "power Glasgow".

Wind farm power-per-unit-area data complete

I have updated my data on windfarms.
I've gone through roughly 75 farms, finding the power per unit area. You can see the results here.
The conclusion is that many Scottish wind farms, located on hilltops, have powers per unit area of about 4 W/m². English and Welsh wind farms are in the range 2-3 W/m² for the most part, though there are a few in England below 2 W/m².
Incidentally, while looking at the windfarms, I had a think about the Braes of Doune photo above, which shows a windfarm ruining the view of Stirling castle. The distance from Stirling Castle to the wind farm is actually about 15km. The photograph subtends an angle of about 3 degrees. It is the sort of view you get through a 670-mm zoom lens.
The two summary figures from my wind farm survey are shown below. The top one shows power per unit area versus turbine diameter; the lower one shows it versus wind farm size. The point style indicates the type of windfarm location.


Acknowledgments
Thanks to Oswald Consultancy and the Renewable Energy Foundation for collating most of the power generation data and turbine specifications. All the original data can be found at OFGEM. Thanks to Ordnance Survey for their getamap service.

"Better than BS 7671 : 2008 IEE Wiring Regulations 17th Edition!"

Friends have been asking "how is the book selling?" - I'm happy to report that Sustainable Energy - without the hot air has been doing quite well. On amazon.co.uk, its sales rank among all books has been wandering around the 100 mark for some time now. And in the list of the most popular Science and Nature books, it's at number 4, ahead of Dawkins' God Delusion, and (a great personal triumph, this) ahead of the IEE's renowned "On-site Guide; BS 7671 : 2008 IEE Wiring Regulations 17th Edition".


I made a graph showing how the sales rank of SEWTHA has evolved on amazon.co.uk and on amazon.com. The light vertical lines mark events, with the most significant ones being the Economist's review, the Cory Doctorow review, and the coverage by the Guardian, which took the sales rank to 47.

The latest piece of good news is that I've been elected a Fellow of the Royal Society. The Society's press release mentions me and the book, which is very nice of them!

Oh no! Green electricity spat!

As I mentioned in another post, I switched from electricity-generator, Powergen, to "Good Energy", out of irritation at Powergen's perpetual greenwash.
Now I've learned from The Guardian that Good Energy may have been duping me with greenwash too!
One of the minor advantages of Good Energy over the competition was that they claimed to actually retire some ROCs (renewable obligation certificates), which has a genuine "additional" effect, as it increases (slightly) the financial incentive to people putting up renewable generation facilities.
However, according to the Guardian, Good Energy have not been retiring as many ROCs as their blurb led customers like me to believe. Oh dear.
Their blurb said things like:
"Good Energy goes above and beyond the percentage required by the government (8.9 per cent in 2008), by retiring an extra five per cent of ROCs (ie, 13.9 per cent in 2008)." but in fact, they've been retiring only about two per cent.
It's an awkward consequence of the slightly goofy Renewables Obligation system.
To get your subsidy for generating wind power, you have to cash in the certificates. (The certificates are then bought by brown companies like Powergen that are not generating enough renewables, to get them off the hook.) If you retire the certificates instead then you don't get any subsidy. So it's really hard to do anything "additional". People trying to do Good get no subsidy.
If Britain had a feed-in tariff instead, like Germany, I think this Catch-22 would be removed. Everyone who generated extra renewable electricity would be rewarded for doing so, and no-one else would be let off any hook thanks to their generation.
It's sad that Good Energy and Ecotricity are having this spat with each other. I was at a round table meeting in London, organized by the Ecologist magazine, attended by both the CEOs of both companies, and there, everyone seemed to be on the same side.
I think, going by the news article, that Good Energy have been naughty. And as a customer I feel a bit disappointed. My advice to Good Energy would be "stop trying to make out, through funny accounting, that you have been retiring 5%. Just give up on the retiring idea".

Whitelee powers Glasgow again

Whitelee wind farm, the biggest wind farm in Europe, is to be completed and 'switched on' this week. And
the news says that the power company is applying to extend the wind farm to increase its capacity from 322 MW to 614 MW.
I mentioned the predicted output of Whitelee in my book (page 33). Since the predictions for Whitelee were one of the sources for my estimated wind-farm-power-per-unit-area of 2 watts per square metre, I thought it was a good idea to look at Whitelee's updated numbers.
When I was writing my book in October 2006, Whitelee's predicted output was said to be "enough to power Glasgow" (Independent, Oct 10, 2006). And now, the latest news says
that, with the proposed increase in capacity from 322 MW to 614 MW, the farm will... generate enough power for [all the homes in] Glasgow!
Curious, Alice might say. We run, and we stay in the same place?
Here are the new numbers.
With two extensions, the total number of turbines would be 221, the capacity would be 614 MW, and the predicted total output is "340,000 households", which in sensible units is 184 MW (assuming that "a household" is defined to be 0.54 kW). This implies a load factor of 30%. The area of the site (according to the Sunday Herald) will increase to 75 km². So the average power per unit area of the enlarged wind farm is predicted to be 2.45 W/m².
What is the honest relationship of Whitelee to Glasgow? (I think talking about 'households' is a bit misleading.) The predicted output of Whitelee, shared between the 616,000 people of Glasgow, would deliver 7 kWh per day per person on average. That's roughly 40% of the total electricity consumption of Glasgow, and roughly 6% of the total power consumption of Glasgow (that's 'total power' including transport, heating, etc; not just electricity).

Implications for the scale of wind farms required for a substantial contribution to British power consumption

If we assume Whitelee (including its planned extension) is representative of future big wind farms that could be built in Britain, here are some more numbers.

• The government's 2020 target is for "33 GW" of wind capacity. That would require 54 more Whitelees. The area of those wind farms would be about 4000 km², about 20% of the area of Wales. The power delivered by those wind farms would be about 4 kWh per day per person, which is roughly 4% of the UK total power consumption today. (That's 'total power' including transport, heating, etc; not just electricity).
• If we wanted to get 20 kWh per day per person from wind power, we'd need 270 Whitelees, which would take up an area of 20,000 km². That's roughly the area of Wales, or 8% of the area of the UK.

If we want to get off fossil fuels using renewables, we must expect those renewable facilities to be somewhat intrusive.

End notes (in anticipation of the responses people often make)

1. Yes, the wind-farm land in between the wind turbines can also be used for agriculture or other activities.
2. Yes, the output of wind farms fluctuates, so if we build wind farms we will have to do some other smart stuff, as discussed in chapter 26 of my book. For example, ensure that lots of smart [easily switch-off-and-on-able] demand is added to the grid, for example, charging electric vehicles and running heat pumps to make hot air and hot water.
   

Hot Air Oscars nomination: GO-GREEN

We are happy to nominate for the "best GREEN advertising" Hot Air Oscar, the "Eco-Smart" organization in America who advertise "877-47-Go-GREEN" on the side of their tastefully green HUMMER.

Is David MacKay "trying to make wind sound useless"? Let's look at more data

I'm delighted to see that the response to Sustainable Energy - without the hot air so far has been remarkably positive. There's just one or two folks who have become convinced that I am anti-wind, that I am deceitfully making wind sound worse than it really is; and they have been running round leaving comments on blogs (for example, you can find one lurking in the comments on this excellent article about the financial cost of wind power (the oil drum), who asserts "MacKay has made a serious error in his calculations of on-shore wind energy resources. ... Some of the wind farms initially built were in poorer locations but close to electric transmission lines, so his calculations are not good examples of what is possible in UK.")
I've written three blog posts about this topic already, encouraging people to provide real data rather than just spreading poisonous rumours. I've now worked through the ordnance survey maps and ROC register entries for about 15 windfarms around the UK, and included the data and maps in a presentation I made at a wind energy conference in St Andrews this week. I am still working on this; what I have focussed on so far is mainly the newest windfarms for which data is available, with the largest numbers of turbines, with biggest diameters, and mainly on scottish hilltops or welsh hilltops or near to the coast. The new data starts at slide 30 and is summarised on slide 41. These onshore wind farms have powers per unit area between 2 and 4.6 watts per square metre. To indicate the rough scale of windfarms required to deliver large amounts of power, I assumed in the book a power per unit area of 2 watts per square metre. So yes, there are windfarms that have powers bigger than 2 watts per square metre. Was I deliberately "making wind power seem worse than it is"? No. I chose 2 watts per sq metre as an estimate of what we could get if we put up lots of wind farms (with the area of Wales), which is obviously going to be less than the power per unit area of the very best spots. Yes, I willingly agree that if we want wind to make only a small contribution (for example, less than 1 kWh per day per person), then it would be appropriate to assume a higher power per unit area - perhaps 3 or 3.5 W/m² instead of 2 W/m², if we keep building in the best spots.

As evidence that I am not deliberately biased against wind, take a look at the data for offshore wind farms.

In my book I assumed a power per unit area of roughly 3 watts per square metre for offshore wind. But the two offshore windfarms in my data have powers per unit area below 2.5 watts per square metre.
There are several other scientists who have used a power per unit area similar to mine when estimating wind resources. For example, Socolow from Princeton uses 2 watts per square metre when discussing his "wedges". On page 234 of my book I cite a study by Elliott et al. (1991) in which windfarms in the best locations in America, covering an area equal to that of California, were estimated to have an average power density of 1.2 W/m².
While my book is technology-neutral, the truth is that personally I am pro-wind! I think wind farms are brilliant, and I'd be very happy be within eye-shot of one almost anywhere in the ordinary countryside.
Please could the commentors call off the dogs?
Thanks! David

More or Less - the Director's Cut

I was on "More or Less"a couple of weeks ago, and wrote an article for the BBC. One topic mentioned was how much good it does to unplug phone-chargers when they are not in use.

On today's programme (8 May 2009) they are going to read out an indignant listener's letter pointing out that "if everyone unplugs their phone chargers, it adds up to a HUGE saving". More or Less asked me to write a short response, which is going out today. I'm worried that people will get the impression I am against switching anything off. So for the record, I would like to point anyone who's interested to the relevant pages of my book (p114) and Chapter 22 (p155) which should make clear that I do think that it's a good idea to find the big vampires and switch them off!
Here's what I wrote for today's More or Less, in full:
Yes, if sixty million people all make a figleaf gesture that saves half a watt (which is roughly one ten thousandth of their power consumption), then the total power saved is,
sixty million times half a watt
which is 30 megawatts, which sounds like quite a lot. It's one thirtieth of the output of a modern power station, for example. But this "if-everyone" multiplying machine is just a misleading way of making something tiny sound big:
30 megawatts is still just one ten thousandth of Britain's total power consumption.
Multiplying tiny things by sixty million to make them sound big is BAD because it distracts people from thinking about sixty million bigger things that are more deserving of our attention. [Heating sixty million buildings, and driving sixty million cars, for example.]

Hot Air Oscars nomination: biodegradable tat from 'I love planet'

I went to Edinburgh botanic garden today. The visitors' shops of such places are often nesting places for the monsters that spawn green tat.
Here I found the "biodegradable ballpoint pen". Pick it up and look at it: apart from the reassuring "planet loving" messages screaming out from its barrel, it looks and feels like a completely normal pen. And I'd be happy to bet that all its biodegradable parts are made from fossil fuels.
Is it really 'loving the planet' if you buy this fossil-fuel-plastic pen and chuck it away, rather than buying a (ten times cheaper) normal fossil-fuel-plastic pen and chuck it away?
I nominate this pen for the Hot Air Oscars consumer feel-good tat award.

Renewable planning map for the USA

One thing I've wanted to do, after the Energy book, is to make an interactive tool that conveys the scale of renewable facilities required to make a difference, and gives the user choices, subject to the "it has to add up" constraint. Here is an NRDC Google map; it's a start - it shows "where renewables have potential" in the USA; but it's not quantitative - it just shows "lowest potential" and "highest potential" on a colour scale, for one renewable at a time. The image above shows the map of Montana for Cellulosic Bioethanol. I suspect the main uses of this map will be (1) wishful thinking [about the 'HUGE' potential of renewables] and (2) NIMBYism [using the argument 'this isn't the best place for it'].
PS - when you drill down into the meaning of the map, the colour scales are given a quantitative meaning, but it's not human friendly and it does not use comparable units. For example the colour code of the Cellulosic map is explained thus:
Each county is color-coded based on total dry tons of cellulosic biomass per year, by county. [12,000; 50,000; 100,000; etc]
If I understand right, they are showing potential per county. That is bizarre. So if there are two identical regions but one happens to be divided into 10 counties and one is a single county, the single-county region will be shown as having big potential and the ten-county region will come out two notches lower.

Hot Air Oscars nomination: Tesco again!

Philip Fowler has nominated Tesco for the "Every Little Helps" lifetime achievement award, in recognition of their services to consumer awareness through labellling toilet paper with its carbon footprint - 1 gram per sheet, giving a new meaning to the motto "Cut the Crap!"

Four simple actions

I wrote an article, "We need a plan that adds up", for The Guardian and publicservice.co.uk. For the Grauniad I also created a new graphic which I thought I would show here.

Four simple actions that make significant energy savings, and one that doesn't.
The left-hand column shows five contributors to the average energy consumption of a typical reasonably-affluent Guardian reader. The right-hand column shows the reduced consumption, post-action.
Any comments? Would the figure work better if I put the phone charger in the middle instead of at the bottom of the list?

Man on radio

BBC Radio 4 has a programme called More or Less, all about numbers. On 24 April 2009 the programme opened with a conversation between me and Tim Harford, talking about energy numbers. Tim likes the book (in fact he likes it so much that he gets its name wrong!) After me, he talks to a lady from the Sustainable Development Commission who graciously dismisses my book for being full of big equations and too technical. Or something. Can anyone understand what she's on about?
If you are quick, you can listen to the podcast.
I also wrote an article for the BBC website, 'Saving the planet by numbers'.

Hot Air Oscars nomination: A Clean Use for Australian Coal

Australian Minister for Resources and Energy, Martin Ferguson, is hereby nominated for the Hot Air Oscar for highest-impact use of the words 'clean', 'ultra-clean', and 'low emissions'.


"This technology unlocks energy from Australia's significant stranded and uneconomic coal reserves."
"Technologies that convert coal and gas to ultra-clean diesel and jet fuel have the potential to replace Australia's declining oil reserves."
"The Australian Government is encouraging the development of coal-to-liquids in Australia through its election commitment to use the $500 million National Low Emissions Coal Fund to support projects generating minimal carbon emissions which utilise our extensive coal resources."


In a nutshell, they're investing government money in turning uneconomic coal that would otherwise have been left in the ground into CO₂ in the atmosphere. Brilliant! Icebergs all round!

Thanks to Alexander Ac for the nomination.

Man holding bulb

On youtube, there is a new video, arranged by the University of Cambridge, featuring someone not unrelated to me, holding a lightbulb and talking about energy plans. Hope you enjoy it! It took three days of filming to make it.

[In case the youtube video goes missing, here is the University's 'Cambridge Ideas' page.]

Every little hurts - Hot Air Oscars

There is
a superb article on Greenwash by Ed Gillespie.

Buy eco-lights, get free air miles.

Wow, Tesco has to be a strong contender for the Hot Air Oscar for best consumer-engagement