UK Renewable Auction Could Deliver £11bn in Consumer Savings by 2050
The UK’s upcoming renewable energy auction could reduce electricity costs for households and businesses by more than £11 billion through 2050, according to new modelling from energy consultancy LCP Delta.
The analysis focuses on Allocation Round 8, or AR8, of the UK’s Contracts for Difference scheme, the government’s principal mechanism for supporting new low-carbon electricity generation. LCP Delta estimates that the auction could procure up to 19 GW of renewable generation across offshore wind, onshore wind and solar photovoltaic projects.
The £11 billion figure represents estimated net savings to consumers rather than the direct value of government support. LCP Delta calculates that additional renewable generation could reduce wholesale electricity costs by around £51 billion between 2027 and 2050 as wind and solar increasingly displace higher-cost thermal generation.
Those savings would be partly offset by approximately £38 billion in additional Contracts for Difference costs and about £2 billion in extra expenditure associated with system balancing and ensuring adequate generation capacity. On that basis, LCP Delta estimates that the overall effect could still exceed £11 billion in consumer savings.
The modelling highlights an important feature of the Contracts for Difference system. Under a CfD, renewable generators compete for contracts based around a guaranteed strike price for their electricity. When market prices fall below that level, generators receive a top-up. When market prices rise above it, generators generally return the difference to the scheme.
The mechanism is designed to reduce revenue uncertainty for developers, helping projects secure financing while exposing consumers to both the costs and potential benefits of long-term electricity contracts.
AR8 Could be Critical for the UK’s 2030 Power Targets
Allocation Round 8 has particular significance because of the government’s Clean Power 2030 strategy.
The government’s Clean Power Action Plan sets indicative 2030 capacity ranges of 43 to 50 GW for offshore wind, 27 to 29 GW for onshore wind and 45 to 47 GW for solar. The wider system would also require significant investment in batteries, long-duration storage, electricity networks and flexible generation.
For offshore wind, LCP Delta describes AR8 as effectively the final CfD auction capable of securing additional projects for delivery by 2030. Onshore wind and solar may have another allocation round in which projects could still be completed within the same timeframe.
The Department for Energy Security and Net Zero has already established the framework for AR8, including eligibility requirements, auction rules and administrative strike prices. The government has also introduced changes intended to give policymakers greater flexibility when assessing value for money and deciding how much capacity to procure.
These changes mean the eventual amount of renewable capacity awarded contracts may depend not simply on a predetermined budget, but also on the prices submitted by developers and the government’s assessment of the wider costs and benefits to the electricity system.
Offshore Wind Prices Will be Closely Watched
LCP Delta estimates that a strike price of around £92 per MWh for offshore wind could offer value for consumers under its modelling assumptions. At approximately that price, it calculates that the government could potentially procure up to 6 GW of offshore wind capacity in AR8.
The economics for onshore wind and solar are different. According to the consultancy, projects using these technologies would need to clear at lower strike prices to meet the same value-for-money assessment, while the amount that can realistically be delivered may also be constrained by supply chains and project pipelines.
These estimates should not be interpreted as guaranteed savings. LCP Delta notes that the eventual consumer impact depends on uncertain assumptions covering wholesale electricity prices, gas prices, system costs, renewable generation output and government policy.
Future wholesale prices are especially important. Renewable generation tends to have relatively low operating costs once constructed, meaning additional wind and solar can reduce the frequency with which higher-cost gas-fired generation determines electricity prices. However, the magnitude of that effect varies depending on demand, fuel prices, grid constraints and the composition of the wider power system.
Grid and Balancing Costs Remain Part of the Equation
Securing renewable capacity through CfD auctions represents only one component of the UK’s electricity transition.
The Clean Power 2030 Action Plan also identifies the need for major expansion of electricity networks, storage and flexible resources. Government planning assumes between 23 and 27 GW of battery capacity by 2030, alongside 4 to 6 GW of long-duration electricity storage and 12 to 14 GW of interconnector capacity.
These investments matter because larger volumes of weather-dependent generation can increase requirements for flexibility and balancing. Congestion on the transmission system can also result in renewable generators being curtailed when there is insufficient grid capacity to transport electricity from where it is produced to areas of demand.
LCP Delta therefore includes around £2 billion of additional balancing and capacity adequacy costs in its analysis rather than examining renewable generation costs in isolation.
For businesses, the outcome of AR8 could influence longer-term wholesale electricity costs and exposure to international gas prices. However, the effect on individual energy bills will continue to depend on several other components, including network charges, policy costs, supplier costs and the structure of electricity contracts.
A Test of Cost and Deployment
The forthcoming auction will ultimately test whether the UK can secure enough renewable capacity to remain on its Clean Power 2030 pathway while keeping contract prices at levels that offer acceptable value to consumers.
The government has identified Contracts for Difference as a central mechanism for delivering the required expansion of renewable generation, while its Clean Power strategy calls for substantial growth in offshore wind, onshore wind and solar before the end of the decade.
LCP Delta’s modelling suggests that achieving those deployment objectives need not automatically increase total consumer costs. Under its assumptions, the additional CfD payments and system costs would be outweighed by lower wholesale electricity prices.
Whether the projected £11 billion in savings ultimately materialises will depend on the prices secured in AR8, how much capacity is awarded contracts, whether projects are delivered on schedule and how energy markets develop over the next two decades.
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