<p>Energy bill data are only available at a Public Electricity Supply (PES) region level. Since the county of Essex and the Chelmsford constituency are both within the Eastern PES region, energy bill estimates for that region have been provided in the following table.</p><p><table><thead><tr><td valign="top">£<br /></td></tr><tr><td valign="top" /><td valign="top">Averageannual domestic bill in Eastern PESregion<br /></td></tr><tr><td valign="top" /><td valign="top">Gas<br /></td><td valign="top">Electricity<br /></td></tr></thead><tbody><tr><td valign="top">2010<br /></td><td valign="top">652<br /></td><td valign="top">407<br /></td></tr><tr><td valign="top">2011<br /></td><td valign="top">713<br /></td><td valign="top">446<br /></td></tr><tr><td valign="top">2012<br /></td><td valign="top">797<br /></td><td valign="top">467<br /></td></tr></tbody></table></p><p>These are based on an assumed annual consumption of 3,300 kWh of electricity and 18,000 kWh of gas per year.</p><p>These estimates can be found in table 2.2.3 (electricity) and 2.3.3 (gas) of DECC's Quarterly Energy Prices publication:</p><p>https://www.gov.uk/government/statistical-data-sets/annual-domestic-energy-price-statistics</p><p>Provisional estimates for average annual energy bills in 2013 will be published on 19 December 2013 in Quarterly Energy Prices.</p>