the further one travels, the less one knows

With Copenhagen's energy summit getting fired-up, we are all thinking about the climate a little bit more at the moment.

One of the popular discussions is around new forms of transportation power, such as electric cars. I'm a believer in 'treading lightly' but I suspect some of the calculations will need refinement for electric cars to become mainstream.

The 'rule of thumb' equation for electric cars consumption goes something like 60mph = 20KWh. In other words, a car travelling at 60 mph for an hour uses 20 Kilowatts of power - roughly 10 fan heaters or 333 60 Watt light bulbs. As a quick cross check, the Toyota Prius peak output is between 43KWh and 73KWh, depending on model - higher than my figures.

To keep things simple, I'll assume that the 60 miles represents the equivalent of an average car's daily travel (ie 20KW) but that it only gets recharged on working days. Thats 220days x 60miles = 13,200 miles per annum or 220days x 20KWh = 4,400KWh per annum. 13,200 miles seems about right as an average.

Now for the average power consumption of a house. I looked this up on a US web-site. US homes have more central heating and are quite appliance rich, so their government statistics are a handy reference. Its around 960 KWh per month, according to the average of all of the States.

So a home uses 12months x 960KWh per annum (call it 12,000KWh) for simplicity. A single car uses 4,400KWh per annum.

Or around 1/3 of a home.

UK has around 25million homes and 33million cars. Lets make that 1.3 cars per household. That's average 5,700KWh per annum. Or an average of around a half a home of charge per night.

Now put the car electricity onto the household power grid. Most people would recharge at night. Say between 7pm and 7am. 12 hours. Thats 12 hours to deliver half of a house's average daily consumption.

Looks to me as if thats pretty much full continuous load.

So does that mean the whole grid needs uprating to support eCar charging? How big is the carbon footprint to do that? Maybe we will find out over the next few days - or perhaps it will take a three year study?

Skyride London 2009: So good I did it twice

I cycled to the start of the London Skyride along the north bank of the Embankment, from around the Chelsea Bridge area. It's a handy route because there’s cycle lanes most of the way and also some pavement sections with markings.

By the time I got to Parliament Square, there was already good evidence of bikes and then I noticed extra road closures (such a Whitehall) to make the access easier.

I was on my little folding bike as I figured it gave me the most options in case anything untoward happened.

In practice, it was an excellent event with great weather. Some chaotic parts around a few of the road crossings, but a gently improving sunny day and just about everyone involved was there for some good natured fun. A few superbikes and super-riders, for sure, but a broad spectrum from kids on bikes with stabilisers, tandems, racers, hybrids, staggeringly expensive looking off-road mountain bikes which I assume would be harder to ride on pure tarmac, fixies, folders, trikes, recumbants, novelty bikes and even Piano-man.

In fact, I called out to Piano-man Oliver Cumming when I spotted him heading the opposite way along the Mall - I'd recognised him from the recent burning piano (catstress photo) incident back at Union Chapel a week ago.

Having reached what I deemed to be the start, I headed around the circuit, which was around 15km from Buck House, through Trafalgar Square, along the Embankment, past St Pauls and out to Tower Hill and then back along a similar route. It was an easy spin and surprisingly quick without traffic to deal with.

In fact, as I got back to the starting area, thought “that was fun, I’ll do it again”. Let it be said that the second circuit was considerably slower. Not because of fatigue, simply sheer volume of traffic. London had become like Copenhagen, but without some of the cycling protocols. From my several months in the Temporary Apartment in CPH early in 2009, I think they have already nailed the Copenhagen Cycle Chic.


By luck, I arrived at the starting area for the second lap at around the time Boris Johnson was doing his photocall. I stopped and managed to get some pictures of the 100 metres that he, Kelly Brook and Gethin Jones cycled with Sir Chris Hoy and which was well recorded by scores of photographers.
Like the opening of the plinth, another 'scene stealer' managed to get past the carefully staged start of the short section and will no doubt appear in some of the press- his tee shirt read "Rules are for Fools". Boris called out something to him as he shot past, and Boris's little contingent seemed suitably amused.

As a reflection, once sitting in the park with other cyclist, it was quite interesting to look at what would happen in London if cycling really did take off in the way of some other foreign cities. There’s still more work on road markings and some aspects of traffic protocol if London is to deal with a considerable increase in volume.

I must admit that I’m all for it. This is a scheme where Boris has hit a good cause and should look for ways to extend it. London Cycle Chic, as they say.