Contracts for Difference (CfDs)
What are Contracts for Difference (CfDs)?
Contracts for Difference (CfDs) are the UK government’s primary mechanism for funding new low-carbon electricity generation. Introduced in 2014 under Electricity Market Reform, CfDs replaced the Renewables Obligation for new projects and are designed to provide price certainty for renewable and nuclear generators while protecting consumers from volatile wholesale prices.
A CfD is a contract between a low-carbon generator and the Low Carbon Contracts Company (LCCC), a government-owned entity. Under the contract, the generator is guaranteed a fixed price for the electricity it produces over a set period (typically 15 years).
How do CfDs work in practice?
CfDs operate through a payment mechanism linked to the wholesale electricity price, known as the reference price:
- If the reference price is below the guaranteed price, the generator receives a top-up payment funded by electricity suppliers.
- If the reference price is above the guaranteed price, the generator pays the difference back to the LCCC.
This structure adds stability for generators while ensuring consumers benefit from the extra revenue when wholesale prices are high. During the 2022–23 energy crisis, CfDs resulted in net payments flowing back to suppliers, significantly reducing policy costs on bills.
Suppliers fund CfD payments via a levy, which is then passed through to electricity customers.
Who pays the CfD levy?
The CfD levy is paid by licensed electricity suppliers and recovered from consumers as a non-commodity charge on electricity bills.
All business customers contribute unless they qualify for an exemption. Certain Energy Intensive Industries (EIIs) may be eligible for partial or full relief, depending on whether a business can meet the qualifying criteria and have their application approved.
Unlike wholesale costs, CfD charges are not influenced by site demand patterns and are therefore unavoidable for most customers.
How much is the CfD levy (and when is it revised)?
CfD charges are set on a forecast basis and reconciled after the delivery period. Once aquarter has finished and actual data is finalised, the LCCC calculates the true cost or surplus for that period.
- If suppliers overpaid, a surplus is carried forward and future levy rates are reduced.
- If suppliers underpaid, the shortfall is recovered in subsequent levy periods.
In p/kWh terms, CfD costs have historically ranged from around 0.3 to 1.0 p/kWh for non-domestic customers. However, this figure can fluctuate significantly depending on wholesale market conditions. In periods of high power prices, the levy can fall close to zero or even become net negative, reducing overall electricity costs.
Because CfDs are still expanding through successive allocation rounds, they will remain a material and evolving component of UK electricity policy costs for decades to come.
If you would like to ensure your CfD 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










