A wind entrepreneur wrote to me last week pointing to the increased variability of wind speeds over the UK. Until recently, he wrote, average monthly wind speeds only very infrequently departed more than 30% from the norm from the month. In the last year, however, he said that we’ve had two months of very high speeds (more than 30% greater than the monthly average) and one very low speed period (30% less than the average for the month). This matters; greater variability of output from wind turbines means more need for backup resources.

Does the data match the entrepreneur’s instinct that variability is increasing? A quick look at average wind speeds since the beginning of 2001 argues it does. The average month now varies about 13% from the norm, up from 9.5% in 2001. This isn’t a large amount, and the data doesn’t suggest a very clear trend, but if variability is increasing it will add to future problems balancing UK electricity supply. And higher winter wind speeds will cause more destruction, as they did over many parts of the UK in February of this year.

Read the rest of this entry »

The amount of travel carried out by people in the UK continues to fall. Whether measured by the number of trips or the distance travelled, people are moving around less. The latest National Travel Survey (NTS) says UK adults made fewer trips in 2013 than they did in 1973. After rising until the early years of the last decade, the average distance travelled has also fallen.

The possible explanations are fairly obvious. The internet has reduced the need for High Street shopping. Working from home is now more common than a generation ago. We tend to meet friends in local restaurants or pubs rather than visiting far-flung relations.

One other potential reason is that people’s real incomes have been dropping in the last few years. And as driving tends to get more expensive, we might expect individuals to drive less if they can. These two arguments sound plausible explanations. But examination of some of the detailed numbers in the NTS shows that they are probably wrong. Surprisingly, the richest 20% have cut their travel miles more than the least well-off 20%. And this reduction is driven mostly by decreased car travel. It’s those who can most afford to drive who have reduced their mileage the most. They still drive far more than poorer people but the difference has dipped sharply. This is additional support for the view that energy use will not rise sharply if incomes rise.

One other striking finding: more young women aged 17-20 now have driving licences than young men in the same age range. This is the first time any age cohort of women has ever had a higher percentage of drivers than men. Read the rest of this entry »

Copyright Karen Pendragon

Copyright Karen Pendragon

Another group of scientists has estimated the environmental burden of beef. The researchers suggest that meat from cows contributes 10 kilos of greenhouse gases (expressed as CO2 equivalents) for every 1000 calories of food. Put in a less scientific way, a Big Mac® a day will represent more than a tonne of global warming emissions a year, using up your entire carbon budget by the middle years of the century.

Seven years ago I wrote an article (covered in the New York Times blog here) that suggested that walking to the shops and then eating beef to replace the calories used would generate more greenhouse gases than driving a car to make the purchases. This little piece of ad hoc research was cruelly dismissed as utter nonsense by all right-thinking people. Well, if you believe the figures published today, I’ve finally got my revenge. Beef turns out to be twice as carbon intensive as driving. Read the rest of this entry »

Last month the headlines excitedly stated that Ofgem had asked the Competition and Markets Authority (CMA) to look at the energy market. Actually, this was a huge exaggeration. Ofgem’s request was for the CMA to examine about 5% of the business: retailing gas and electricity to domestic consumers and very small companies. Sales to large organisations are excluded, accounting for over half the market, as are the upstream activities of energy generation (50% of consumer bills), the transport of energy over wires and pipes (about 20% of the domestic bill) and taxation and social and environmental levies (15%).

Market participants nevertheless genuinely seem to hope that the CMA investigation will change the way the whole energy market works, freeing up investment in generation and improvements in networks as well as stabilising prices. This note looks at how participants, particularly including the new generation of smaller retailers, might choose to respond to the investigation if they want to influence its outcome. (Full disclosure: I was member of the Competition Commission, a predecessor of the CMA, for seven years and a tribunal member on the specialist panel at the Commission dealing with the – very rare – appeals against Ofgem decisions).

The central point I want to make is that smaller energy companies and consumer bodies should understand that a market investigation by the CMA is a mammoth, many-headed process. The CMA is hugely thorough and data-driven and the demands it places on companies are often almost overwhelming. Inquiries can last for up to 24 months, not the 18 months specified in recent press releases.

To be effective, and to get arguments taken seriously by the CMA, participants need to devote resources to the process, almost certainly in a joint undertaking with groups of similar views. Occasional letters to the CMA will not work when the Big Six will be spending tens of millions of pounds on lawyers. Read the rest of this entry »

Sawton Mill near Totnes. Tresoc will buy a share in this if it is fully financed

Sawton Mill near Totnes. Tresoc will buy a share in this if it is fully financed

Totnes Renewable Energy Society (Tresoc) in Devon is trying to raise up to £1.5m to fund a portfolio of six PV and hydro projects near the town.  What makes Tresoc unusual – and perhaps unique in the UK – is that is both financing current projects and developing a wide variety of new ventures, including an innovative waste-to-energy plant and biomass scheme for future investment.

This is an ambitious scheme to create a genuinely local energy company that might eventually hope to directly supply its electricity and heat to investors, rather than selling to a big power company. One day, this may make it an exciting form of new energy enterprise. But therein lies in the problem. Tresoc is asking for investors to back what is, in effect, a renewables development company. Read the rest of this entry »

In the last post I looked at the evidence of the decreasing use of resources in the UK. The Environmental Accounts have just provided a new measure of material use, called Raw Material Consumption, which gives us a better estimate than previous series. The new index includes a figure for the resources used elsewhere in the world to make things that are then imported into the UK.

If we divide Raw Material Consumption, expressed in millions of tonnes, by GDP we get a figure for the weight of physical resources the UK uses to generate a £ sterling of income. The figure has fallen from about 513 grams in 2000 to around 358 in 2012. The average reduction is just under 13 grams a year for each £ sterling of GDP. This is equivalent to a 30% reduction since 2000. (All these figures exclude fossil fuel consumption, which isn’t included in the statistics. However we do know that energy consumption is also falling fairly consistently each year).

Grams per £

Grams per £ sterling of GDP is an important measure and should be targeted. As we move haltingly to an economy that productively recycles everything for ever, we will reduce the volumes of materials harvested or mined. And moving to low carbon sources of energy, whether PV or nuclear also reduces the weight of resources we need to extract, as well as reducing CO2 emissions.


In late 2011 I wrote a paper which suggested that the UK’s consumption of material goods had peaked. I pointed to the evidence from a variety of different statistical sources that the weight of the things we use to sustain a modern economy was tending to fall. This included products such as fertiliser, water, steel, concrete and food. I saw this as very good news; increasing prosperity would not necessarily imply increasing use of natural resources. Recent data support the ‘Peak Stuff’ hypothesis and suggest that economic growth in advanced countries doesn’t increase the use of material extracted from the soil or earth’s crust. I think the ‘dematerialisation’ idea has real strength to it. Read the rest of this entry »

Heating buildings is the single most important use of fossil fuels in high latitude countries such as the UK. In the average British home gas use is almost five times as much as electricity consumption. The Green Deal is a part of the approach to cutting heating demands but ‘the Renewable Heat Incentive (RHI) is the main scheme of the heat strategy’, according to DECC.

The RHI for domestic homes was finally launched at the beginning of April after a gestation period of about five years. According to the most recent data, just 79 homes signed up for the RHI in the first two months. Although the RHI subsidy scheme offers some tempting payments, the signs so far are that this scheme will fail in the same way as the Green Deal has done. Read the rest of this entry »

The UK government is keen to encourage more involvement by communities and individuals in commercial renewable energy projects. In particular, it believed it had made a voluntary agreement with the main developers to offer local people the chance to invest in new schemes. It had hoped that it would not have to legislate to oblige commercial companies to let communities buy shares.

Unfortunately the agreement doesn’t appear to be working. Even big companies are ignoring it. One recent example is the Rhyd-y-Groes wind farm on Anglesey. E.ON, the huge German-owned utility, is starting the local consultation process prior to applying for planning permission to take down the existing turbines and put a much larger wind farm in its place, probably in late 2015. It is not offering a stake to local people. When I asked why the company was ignoring the agreement to facilitate community ownership I was told in an email

‘Every project is assessed on it’s own merits and it also depends on the size of the project’. Read the rest of this entry »

Capturing the energy in the tides is an expensive business. The 340 MW Swansea tidal lagoon project is going to cost the best part of a billion pounds although future UK tidal lagoons will probably be much cheaper. (This project is raising first stage development funding from individual investors. See tidallagoonswanseabay.com for further details).

A Dynamic Tidal dam, showing different sea levels on either side

A Dynamic Tidal dam, showing different sea levels on either side

Earlier in the week an even more ambitious scheme took another step forward. A Dutch/Chinese joint venture announced that its $40bn plan to capture the energy from tides off the coast of China had entered formal economic evaluation by the national government after several years of feasibility studies. If you thought you knew what tidal power plants looked like, think again. It isn’t a barrage across an estuary, nor a lagoon and even less like the Marine Current Turbines underwater windmill. It’s a giant embankment heading 40 km out into the sea completed at the far end by a sea wall running perpendicular to the main structure. Read the rest of this entry »

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