The Energy Company Obligation (ECO), first introduced in 2013, is an energy efficiency scheme for Great Britain that places legal obligations on energy suppliers to deliver energy efficiency measures to domestic premises. The fourth wave of the scheme (ECO4) runs to 31 March 2026.
ECO4 focuses on improving the least energy efficient homes, as only properties in EPC (energy performance certificate) band D-G can be treated. It also requires a more complete upgrade of those homes, shifting to a fabric-first multi-measure whole-house retrofit approach which prioritises the installation of insulation before considering other measures, such as air source heat pumps (for heating and hot water) and solar PV.
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Green Harbour ECO4 is a trading name of Gray Matter Marketing Ltd, registered in England and Wales.
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