Energy retailers have delivered more than £8.5 billion in estimated lifetime bill savings to fuel poor and vulnerable consumers through the ECO3 scheme, Ofgem figures have revealed. The regulator’s final determination report into the scheme, which ran from October 2018 to March 2022, shows that a total of more than 1 million measures were installed during this period. Only one supplier failed to fulfill its obligations, leaving a £35 million shortfall.