In early May 2025, a major development rocked the UK’s clean energy agenda: Danish energy company Ørsted cancelled its plans for Hornsea 4, a massive 2.4GW offshore wind farm off the coast of East Yorkshire. Despite holding a 15-year government contract with guaranteed pricing, the project was deemed economically unviable. It would have powered over a million homes and been one of the largest offshore wind farms in the world.
This follows a similar withdrawal by Swedish developer Vattenfall in 2023, which shelved a 1.4GW project off Norfolk before selling it to RWE. Two world-class developers, two large projects halted in less than two years, despite clear government ambitions and signed contracts. What’s going wrong?
Why Offshore Wind Costs Are Rising
Offshore wind was once hailed as a cost-reduction success story, with auction prices falling rapidly through the late 2010s. But today, the economics have shifted dramatically. Key drivers include:
- Global inflation: The cost of raw materials like steel, copper, and concrete has soared since the pandemic and the Ukraine war.
- Supply chain constraints: Delays and bottlenecks across turbines, cables, and installation vessels are pushing up lead times and risk.
- Rising interest rates: Financing large-scale infrastructure is much more expensive than it was two years ago.
- Currency fluctuations: Weakened sterling impacts imports of specialist components and services priced in dollars or euros.
- Overly aggressive CfD pricing: Government-backed Contracts for Difference (CfDs) offered in recent auctions have failed to account for these inflationary pressures, locking in prices that no longer reflect real-world costs.
Hornsea 4’s guaranteed price was set when costs were significantly lower. But with no inflation-adjusted mechanism and tight margins, the project became a commercial liability rather than an investment opportunity.
The Bigger Picture: Is the 2030 Target at Risk?
The UK government, under its Clean Power 2030 mission, wants 95% of electricity to come from clean sources within five years, up from just over 50% today. To get there, the country must:
- Triple offshore wind capacity
- Double solar and onshore wind
- Build 620 miles of new grid infrastructure (including substations and pylons)
This is one of the most ambitious energy transitions attempted in a western economy. Yet, with two flagship projects scrapped and mounting opposition to new pylons and solar farms in rural communities, many experts, including Oxford’s Prof Dieter Helm, are questioning whether the 2030 timeline is remotely achievable.
Even Chris Stark, head of the Clean Power mission, has admitted it will require a “Herculean effort.”
What Needs to Change: Policy and Practical Next Steps
To stop more offshore projects from collapsing, the government must act decisively. Here’s what we recommend:
- Allow Higher Strike Prices in CfD Rounds Pricing must reflect real market conditions. Allowing developers to bid higher prices per MWh in the next auction round would give them the financial room needed to cover today’s capex and opex realities.
- Introduce Inflation-Linked CfDs Tying future contracts to inflation or key commodity indices would help de-risk long-term revenue projections and ensure contracts stay viable even in volatile markets.
- Streamline Permitting and Planning Offshore wind projects often face complex environmental and legal hurdles. Simplifying and accelerating the permitting process would reduce delays and uncertainty, two major cost drivers.
- Invest Public Capital in Offshore Infrastructure The government should consider direct public investment or co-investment models, particularly in shared offshore grid infrastructure, ports, and installation facilities. This would lower costs for developers and reduce duplication.
- Reinforce the UK Supply Chain Support for domestic manufacturing of turbines, blades, cabling, and other components would reduce import dependency and hedge against global supply shocks.
- Coordinate Grid Expansion and Storage New offshore generation must be matched by grid readiness. This means faster grid expansion and deployment of energy storage to handle intermittency and reduce curtailment losses.
- Create a National Offshore Wind Delivery Body A dedicated body, similar to the UK Infrastructure Bank or the National Grid’s ESO, could coordinate planning, funding, and delivery, ensuring joined-up thinking between developers, grid operators, and government.
A Make-or-Break Moment
Offshore wind remains one of the UK’s best hopes for delivering clean, scalable, and secure energy. But the economics have shifted, and policy must keep pace. If the government truly wants to lead the world on clean power, it must show flexibility, realism, and commitment now.
The target is ambitious, and rightly so. But ambition without adaptation risks failure. If projects like Hornsea 4 continue to fall through, the consequences won’t just be missed targets, they’ll be higher bills, lower investor confidence, and a slower path to net zero.
While You Are Here…
Why not use one or all of Bryce Energy Services free online calculators.
Carbon Footprint — Solar Panels — Electric Chargers — ISO 50001 Gap Analysis
Or demonstrate your business is environmentally and socially responsible, with the CSR Accreditation.
Try our ‘new’ New Vehicle Carbon Footprint Calculator now.
Blog News Carbon Footprint
The Carbon Cost of Building the Future: Why Capital Projects Need Their Own Carbon Accounts
Across the UK, enormous amounts of capital are being invested in new infrastructure. Electricity networks [...]
Oct
Blog News Carbon Footprint
Carbon Accounting Without Adding Another Job to the Business
For many businesses, the biggest barrier to carbon reporting is not necessarily the calculation itself. [...]
Sep
Blog News Carbon Footprint
Your Carbon Footprint Is Only as Good as the Data Your Suppliers Give You
For many businesses, calculating Scope 1 and Scope 2 emissions is relatively straightforward. You can [...]
Sep
Blog News Carbon Footprint
Stop Measuring Carbon in Isolation: Use the Metrics That Already Run Your Business
Most businesses understand the basic idea of carbon reporting: Measure emissions this year. Measure them [...]
Aug
Blog News Carbon Footprint
Net Zero to 2050: Perhaps the Carbon Plan Should Become the Business Plan
For many businesses, 2050 feels a very long way away. Most organisations rarely plan in [...]
Aug
Blog News Carbon Footprint
Climate Change Has Not Gone Away Because a Council Votes to Stop Calling It an Emergency
There can hardly be a worse time for councils to start reversing climate emergency declarations. [...]
Aug
Blog News Carbon Footprint
Your Profit and Loss Account Is Not a Carbon Footprint
Carbon accounting is becoming increasingly important to businesses of every size. Customers are requesting emissions [...]
Aug
Blog News Sustainability
A Billion Plastic Pellets on Our Doorstep — Where Is the Urgency?
A significant environmental incident is unfolding on the beaches of North East England, yet beyond [...]
Jul
Blog News Carbon Footprint
Net Zero Airports? We Need to Talk About Facilitated Emissions
Airports are increasingly publishing impressive carbon-reduction claims. “Airport emissions reduced by 50%.” “Carbon-neutral operations.” “Net [...]
Jul
Great article thanks for posting.