The left hand axis for all these charts is kWh/year. You can check your bills to see where you come in.
Energy Use by region There is very little variation in gas or electricity bills due to region. |
The most important factor is clearly size but there is a lot of variation between dwellings of similar sizes. The next charts show how much. The red line marks the 50% mark so 50% of households are above and 50% below. The blue lines are the quartiles so 50% of the households are between those bands. There is more variation in the electricity bills than in the gas: for one bedroom dwellings, the upper quartile gas bill is twice the lower one but the electricity bill varies by a factor of 3.
There are also more extreme households (not shown in the charts): for electricity the top 5% of 1 bedroom households use 8900 kWh/year which is 4 times the median and the bottom 5% use only 600 kWh/year which is a bit less than a third. At the top end there will be households using electricity for heating though 88% of households are centrally heated with something other than electricity [2]. For gas the top 5% use 2.4 times the median but the bottom 5% use only 1/7th - which suggests some households are economising hard on heating but not so much on electricity.
Range of variation of electricity and gas usage by dwelling size
Mean energy use by income in 2007 and 2010
|
Electricity consumption reduced by 5-6% across all income levels. Gas consumption reduced by 16% in the poorest households bit only 11% in the high income households.
As you can see, we have slightly reduced our electricity consumption a little across all household income levels. For gas however we have done better with an overall reduction of about 16% at the low income levels reducing to 11% for the wealthiest. It is hard to say how we have achieved these savings in gas use. Some are undoubtedly due to installing heating efficiency measures and since there have been lots of subsidies targetted to help low income households it may be that they have been effective. From the NEED report, typical savings from a new condensing boiler are around 12%, from cavity wall insulation around 10% and from loft insulation about 2% (but the latter may be an under estimate because NEED only knows about professionally installed insulation and lots of people do loft insulation DIY).
However, some of the gas savings are certainly due to the residents taking zero cost measures such as turning down thermostats or reprogramming the heating timer to reduce the hours of heat. This is an efficiency measure too, if the savings are from unnecessary heating but for some this could be a loss in comfort.
All households have reduced their energy use for both gas and electricity but we can only speculate as to why. Money is less likely to be a concern at the higher income levels, but from my experience talking to a range of people, there is widespread concern about carbon emissions. Savings are bigger for gas than for electricity, perhaps because it is easier to reduce gas consumption without changing your habits. It is easier to do a bit of draught stripping or lower the thermostat than reducing your TV watching or run the washing machine less often. Even the poorest households have only reduced their electricity use by about 5%. However, with such a huge variation between households it goes to show that it is possible to use less, if we really want to, especially at the top end.
Research conducted in many countries often finds that comparison with neighbours and friends is a good way to motivate people to use less energy. DECC asked Ipsos Mori to conduct a survey to see how we in the UK would react to having a 'typical usage' benchmark provided on our bills [4] They concluded that some households would find this helpful and they would like the benchmark to be specific to their local area which suggests that we Brits also like to compare ourselves with our neighbours first. However, the NEED data shows that other factors are far more important in setting a credible benchmark for average use.
[1] Based on 20 year average degree days to base 15.5 C from Vesma
[2] Based on average fuel price index for all of 2007 and all of 2010 from UK National Statistics
[3] From Great Britain's housing energy fact file from DECC 96% of homes are centrally heated and only 8% of those are all electric.
[4] Empowering Households - Research on presenting energy consumption benchmarks on energy bills Undertaken by Ipsos MORI for DECC
No comments:
Post a Comment
Comments on this blog are moderated. Your comment will not appear until it has been reviewed.