To ask the Secretary of State for Energy what is his Department's estimate of the saving in electricity demand which would result from insulation to the highest standards being advocated by his Department of (a) 33 per cent., (b) 50 per cent., (c) 66 per cent., (d) 75 per cent. and (e) 90 per cent. of all homes in England and Wales.
A recent estimate has indicated that if all cost-effective insulation measures were applied, where relevant, to the housing stock in England and Wales 5·5TWh of electricity, used in space and water heating, could be saved. This represents 2·4 per cent. of the total electricty consumed in England and Wales.However, householders are likely to opt at least in part for greater warmth rather than simply saving energy.