The UK energy companies do!

Any gas and electricity companies that have more than 150,000 customers are obliged to fund ECO measures. 

Energy companies are obliged to pay for the ECO scheme, not the government. This is because the UK government has committed to reducing carbon emissions, and one of the ways they plan to do this is by making homes more energy efficient. The ECO scheme is part of this plan.

The energy companies are required to meet certain targets for the number of homes they improve under ECO. If they don’t meet their targets, they have to pay a penalty to the government. The money from the penalties is used to fund other energy efficiency schemes.