Britain's Wind Power Conundrum: A Review of Grid Constraints and Curtailment Costs

Britain's push towards net-zero emissions under Energy Secretary Ed Miliband's plans is facing a significant hurdle - the country's lack of grid capacity to handle the increasing amount of renewable energy being generated from wind farms. The result is that grid operators are having to pay millions of pounds to wind farm owners to switch off their turbines, while also paying gas-fired power plants to generate replacement power, effectively throwing away a huge amount of "phantom" power. This practice, known as curtailment, has cost Britain over £860m in 2025 alone, according to the tracker website Wasted Wind, and is set to become even more expensive in the future.

Key Takeaways:

• Grid operators are paying wind farm owners to switch off their turbines, wasting millions of pounds' worth of "phantom" power, due to a lack of grid capacity to handle the increasing amount of renewable energy being generated.
• The cost of curtailment has already reached over £860m in 2025, with experts warning that it will become even more expensive in the future, potentially surging to £8bn per year by 2030.
• The National Energy System Operator (Neso) is working to speed up power line upgrades, but even then, the cost of curtailment is predicted to only fall to between £2.8bn and £3.7bn per year.
• The delivery of these upgrades on time is far from guaranteed, leaving the Government with "very limited options", according to Jason Mann, an electricity markets expert at FTI Consulting.
• Major market reforms, including zonal pricing, are being advocated to address the issue, which would split Britain's electricity market into regional markets with their own prices dictated by local supply and demand.
• The current system incentivizes wind farms to generate power even when there is little need for it, due to government subsidies and contracts for difference (CfD) guarantees.
• Telegraph analysis reveals that some companies, such as the Moray East offshore wind farm, are profiting at both ends by owning wind farms and gas plants.
• Generating companies, such as Scottish Power and SSE, are arguing for reforms to the national pricing system, citing the need to accelerate investment in the grid infrastructure to unlock the full potential of clean energy and reduce bills.
• EDF is also defending its current approach, stating that curtailment plays an important role in managing the electricity system, particularly due to the challenges posed by the UK's ageing energy infrastructure.

Statistics:

• The cost of curtailment has reached over £860m in 2025.
• The cost of curtailment is predicted to surge to £8bn per year by 2030.
• Neso is forecasting that constraint costs will only fall to between £2.8bn and £3.7bn per year after power line upgrades.
• Wind farm owners are paid over £60m this year alone for the Moray East offshore wind farm.
• The UK's grid infrastructure needs to keep pace with the growth of generation, according to Scottish Power.

Sources:

• Wasted Wind: a tracker website that reports on the cost of wind farm curtailment.
• Ofgem: the UK's energy regulator.
• Octopus Energy: a leading energy supplier.
• National Grid: the UK's electricity network operator.
• Scottish Power: a leading energy company.
• SSE: a leading energy company.
• EDF: a leading energy company.
• FTI Consulting: a consultancy firm.
• Telegraph analysis.
• Energy Secretary Ed Miliband's department.