When electricity is generated up to 60% of the energy produced can be wasted as lost heat. Combined Heat and Power schemes are designed to recover most of this waste heat and use it to power a turbine and generate more electricity. In well-designed installations these can contribute to lowering carbon dioxide emissions. Cogeneration is a reliable and proven way of generating required power volumes onsite, thus securing supply. Combined heat and power systems can also use low carbon primary fuels such as biogas.