A trio of energy firms are stumping up cash for not putting insulation in enough low-income homes.

The latest fines agreed with regulator Ofgem today are £1.75m from Scottish energy supplier SSE, £2.4m from ScottishPower and £450,000 from GDF SUEZ.

The country’s largest energy companies were given targets for the number of people they needed to help. Many fell short and were lumbered with multi-million-pound fines.

SSE was only able to meet 90.9% of its target by the deadline of the CESP scheme, the end of December 2012. They installed more than 43,000 measures to roughly 21,000 homes but this was sort of the target.

The £1.75m will go to groups helping the fuel poor and vulnerable. Will Morris, Group Managing Director for Retail at SSE said they were “very sorry” as they worked “very hard to deliver what was a very challenging and complex scheme”.

ScottishPower hit 70% of its obligation, making it up by April 2013, while GDF SUEZ delivered less than two-fifths (38.6%) of its target.