What Energy Suppliers are Obligated to Take Part in ECO4?

The ECO scheme places a Home Heating Cost Reduction Obligation or HHCRO on medium and large energy suppliers that determine if they must take part in the ECO4 scheme.

Under the HHCRO, the obligated suppliers are required to promote energy efficiency measures that will greatly improve the ability of low-income, fuel-deprived, and vulnerable households to help heat their homes.

Who Are the Obligated Suppliers Taking Part in ECO4?   

Significantly sized energy suppliers have legal obligations under the ECO scheme, providing they meet the obligation threshold.

Customer numbers and supply volumes will be considered to determine if a supplier is obliged to take part.


  • British Gas
  • E (Gas & Electricity) Ltd
  • E.ON UK Solutions
  • Ecotricity
  • EDF
  • Octopus Energy
  • Outfox the Market
  • OVO
  • Scottish Power
  • So Energy (Includes ESB Energy)
  • The Utility Warehouse
  • Utilia Energy


The suppliers are responsible for meeting their target obligations and making sure that they, and any members of the supply chain acting on behalf on the supplier (installers), abide by the scheme requirements.


The country’s biggest energy suppliers are obliged to take part in the ECO4 scheme and, therefore must point their fuel-poor, low-income, and vulnerable customers in the direction of the scheme to help with their situation. These can be methods to reduce energy use by installing insulation or upgrading an old heating system.

To contact any of the obligated suppliers, visit our support hub where you will find all the information needed to get in touch about the ECO4 scheme.

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