Families are using nearly a quarter less energy than in 2005 as household efficiency measures and rising costs have taken effect.
The average home usage in England and Wales fell by 24.7% over the period to 2011, according to the Office for National Statistics (ONS).
The highest regional consumption levels, which were adjusted to take into account the variations in weather, were in the east Midlands, the data showed.
It appeared that regions with the highest level of Economy 7 consumption of night-time cheap electricity use more energy overall.
Across England and Wales, average household energy consumption fell from 26.2 megawatt hours (mWh) in 2005 to 19.7mWh in 2011.
Improvements such as better loft and cavity wall insulation as well as more efficient boilers may be among the reasons for the decrease, the ONS said.
Another could be the introduction of energy rating scales for properties and household appliances, allowing consumers to make informed choices about purchases, it added.
There has also been “increasing public awareness of energy consumption and environmental issues” while at the same time the price of gas and electricity across the UK has been rising.
The average household energy consumption in the east Midlands in 2011 was 27.5 mWh, well above the national average, while the south-west had the lowest, at 16.1 mWh.