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Half of the big six energy firms are to be investigated by industry regulator Ofgem for failing to meet all of their legally binding energy efficiency targets.

British Gas, Scottish and Southern Energy (SSE), and Scottish Power all missed one or more of their targets under the Carbon Emissions Reduction Target (CERT) and the Community Energy Savings Scheme (CESP) - the government schemes which preceeded the Green Deal. Both schemes ended on 31 December 2012.

Energy generators Drax, GDF Suez/IPM and Intergen are also being investigated for failing to meet targets.

However, other firms exceeded their targets meaning that 99% of the energy savings required were achieved.

Under CERT firms were required to deliver overall carbon savings of 293m Mt CO² of that 73.4 Mt CO² had to be delivered through insulation measures being installed.

Both SSE and British Gas missed their contributions to these two targets. SSE also only delivered 99.7% of its required energy savings in poorer and elderly households and 73.8% of the energy savings it needed to deliver to the highest priority group of the most vulnerable.

Scottish Power and British Gas also missed their targets to deliver energy savings under the CESP scheme, which targets the most deprived areas of the country. British Gas achieved 62.4% of its target and Scottish Power delivered 70% of its savings.

Sarah Harrison, Ofgem鈥檚 senior partner in charge of enforcement, said it was a welcome result that 99% of the energy savings targeted had been delivered.

But she added: 鈥淥fgem鈥檚 role is to ensure that consumers do not lose out by the failure of firms to deliver all the help required or are not disadvantaged by late delivery. This is why Ofgem is today launching investigations into six firms who have failed one or more of their energy efficiency targets set by government.鈥�

Richard Griffiths of the UK Green 好色先生TV Council, said: 鈥淭hese figures show that significant steps have been taken over recent years in delivering the 鈥榚asy wins鈥� in home energy efficiency and that is, of course, encouraging.

Richard Giffiths, consultant at the UK Green 好色先生TV Council, said that 鈥渟ignificant steps鈥� had been taken to deliver 鈥渆asy wins鈥�.

He added: 鈥淗owever, we should not underestimate the scale of the challenge that remains ahead. Delivering even these simple measures was no small task despite them being relatively easy to install and incredibly cheap (or free) to households.

鈥淢any of the lofts and cavities that remain are either technically 鈥榟ard to treat鈥� or belong to households that have been consistently hard to reach.鈥�

He said that the Green Deal and Eco schemes now needed strong long term incentives to ensure these more tricky tasks were accomplished.

During the CERT programme 3.9m lofts and 2.5m cavity walls were insulated.

Under CESP 75,000 solid walls were insulated and a further 24,000 lofts were insulated.