The Energy Company Obligation (ECO4) is a government scheme aimed at helping eligible households reduce their energy bills by providing funding for energy efficiency improvements. The scheme requires large energy suppliers to support low-income and vulnerable households by funding measures such as insulation, heating upgrades, and other energy-saving solutions. ECO4 specifically focuses on delivering energy efficiency measures to those most in need, including people with low incomes, those living in fuel poverty, and individuals with health conditions, helping to improve their homes’ energy performance and reduce carbon emissions.