<p>The Energy Company Obligation (ECO) places a requirement on larger energy suppliers to deliver heating and insulation measures to eligible low-income and fuel poor households. Energy suppliers recoup delivery costs through consumer bills.</p><p> </p><p>Homes benefitting from ECO4 will cut approximately £430 off their energy bills.</p><p> </p><p>The Department does not hold data on the number of households affected by poor standards of workmanship under ECO. Through the ongoing evaluation of ECO4, we are gathering feedback from a sample of households on their satisfaction with installations.</p>