Renewables Obligation (RO)
What is the Renewables Obligation (RO)?
The Renewables Obligation (RO) is a UK government policy introduced in 2002 to support renewable electricity generation.
Its objective was to increase the proportion of electricity supplied from renewable sources by placing a legal obligation on electricity suppliers.
Under the scheme, suppliers must present a set number of Renewables Obligation Certificates (ROCs) to Ofgem each year, based on the volume of electricity they supply to customers. ROCs are issued to operators of renewable electricity generating facilities, based on the amount of renewable energy generated.
The RO closed to new generation in March 2017, but it remains in force because accredited renewable generators continue to receive ROCs for up to 20 years. As a result, the scheme will continue to impact electricity bills well into the 2030s.
How do ROCs work in practice?
Renewable generators earn ROCs for the electricity they produce and sell those ROCs to suppliers, either bundled with power or separately. Suppliers then use ROCs to meet their annual obligation.
If a supplier does not present enough ROCs, it must instead pay a buy-out price per missing ROC to Ofgem. These buy-out payments are collected into a central fund and recycled back to suppliers that did present sufficient ROCs. This recycling mechanism increases the cost of non-compliance and underpins the value of ROCs.
Ultimately, suppliers recover these costs from customers through electricity bills.
Who pays the RO?
The RO is charged to all electricity consumers, with the cost passed through by suppliers as a non-commodity levy. For most business customers, it appears as a separate line item rather than being included in the wholesale unit rate.
Certain Energy Intensive Industries (EIIs) may qualify for partial or full exemptions, subject to meeting eligibility thresholds and submitting approved applications.
How much is the RO ?
RO charges are revised annually for each obligation year, which runs from 1 April to 31 March. The buy-out price is linked to inflation, meaning RO costs generally rise over time.
In p/kWh terms, the RO typically equates to around 2.5–3.5 p/kWh for business electricity customers in recent years, depending on the obligation level, recycling outcome and supplier methodology.
This makes it one of the largest policy costs on a UK electricity bill.
Because the final cost is only confirmed after the obligation year ends, suppliers must forecast RO charges in advance. This makes transparency and reconciliation particularly important for larger energy users.
If you would like to ensure your RO charges have been invoiced correctly. Contact us today and we can review your recent invoices to make sure you aren't paying more than necessary.
Contact Us









