Ofgem is reminding energy firms it is enforcing the Government's Carbon Emissions Reduction Target (CERT). The regulator wants to incentivise those companies who fail to reach against their targets by the end of the year to continue to deliver measures to consumers in the early part of 2013. CERT requires electricity and gas suppliers to hit targets for a reduction in CO2 emissions generated by the domestic sector. The overall target level of carbon emissions savings is 293 million tonnes.