nClimate change is no longer a prediction but a reality. Summers in the UK are becoming increasingly hot, heavy rains more frequent, and coastal erosion is intensifying. Without emission reductions, humanity will lose habitable land. For the UK, energy transition is not a moral stance but a matter of national survival. Only rapid decarbonization can ensure economic stability, job security, and energy safety.n
nThe backbone of this transition is the Contracts for Difference (CfD) system. The government and power generators agree on electricity prices in advance; if the market price falls below this line, the government subsidizes the difference. Conversely, if the market price exceeds it, generators return the surplus. The key to this system is not the subsidy amount but its stability. With predictable income, banks are willing to lend, and investors are willing to take risks. Wind and solar power require substantial upfront capital, and without price stability, financing costs would make many projects unfeasible. CfD makes clean energy financing possible and has positioned the UK as a leader in wind and solar energy in Europe.n
nThe sixth auction round (AR6) in 2024 is the latest outcome of this system. All figures are adjusted to 2025 prices. The mainstream offshore wind contract price is about £82 per megawatt-hour, while onshore wind and solar range from £70 to £75. In contrast, the nuclear power plant Hinkley Point C has a contract price of £130, with Sizewell C close to this level. Although wind power is affected by climate, its average generation cost has steadily decreased; nuclear power offers stable supply but is expensive and involves 35-year contracts, with taxpayers ultimately bearing the risk.n
nAR6 also includes two costly new technologies: floating offshore wind at about £195 per megawatt-hour and tidal power at around £240. These projects have minimal installed capacity and negligible impact on overall electricity prices. Their value lies in demonstration and technological maturity. Floating wind can open up deep-sea wind farms, while tidal power is predictable and stable. The government bears high costs to help new technologies cross the ‘valley of death’ towards scalability, mirroring the trajectory of fixed-bottom wind power from expensive to widespread.n
nMeanwhile, gas-fired power plants remain the system’s backbone. The cost of existing gas turbine plants is about £70 to £90 per megawatt-hour due to long-term depreciation; however, building new combined cycle gas turbines (CCGT) would raise costs to £110 to £120. This gap means that when old plants are decommissioned, maintaining supply will require more expensive reconstruction. Some politicians argue that the UK should continue relying on CCGT and avoid investing in grid upgrades to keep electricity prices low. This appears pragmatic but is short-sighted. Existing gas plants will eventually be decommissioned, and without grid upgrades and renewable energy expansion, more CCGTs will be needed to fill capacity gaps. The result will be larger investments and higher costs. The long-term average cost per megawatt-hour will far exceed current wind, solar, and grid upgrade expenses. Relying on fossil fuels seems cost-effective but merely delays the bill.n
nMore critically, national security is at risk. Fossil fuels are concentrated in a few oil-producing countries, and the UK’s long-term reliance on natural gas means its energy lifeline is in the hands of ‘oil nations.’ When geopolitical tensions rise and supplies are constrained, the UK is forced to pay high fuel costs. Moreover, traditional centralized power plants are more vulnerable to attacks. Since the Russia-Ukraine war, multiple countries have seen power facilities destroyed and grids paralyzed, highlighting the resilience and necessity of decentralized energy systems. Building a more flexible grid is not just an economic consideration but a defensive strategy.n
nIf the UK fails to continue reducing emissions, it will also face trade consequences. The EU is about to fully implement the Carbon Border Adjustment Mechanism (CBAM), imposing carbon taxes on imported products. If the UK continues to produce with high-carbon electricity, exports to the EU will be taxed, losing price competitiveness and incurring heavy emission reporting and auditing procedures. Ideally, the UK and EU would reach an agreement to mutually recognize carbon pricing systems, exempting UK products from carbon taxes and administrative costs. This is also the economic motivation for emission reductions: without decarbonization, market access is lost.n
nThe seventh auction round (AR7) began in August 2025, with results expected in early 2026. The government plans to extend contract terms from 15 to 20 years and relax planning permission thresholds for offshore wind. The goal is to deploy over 40 gigawatts of offshore wind by 2030. This competition is not just a battle of technology and capital, but a choice of long-term national direction.n
nThe real issue with the UK’s energy policy has never been ‘which kilowatt-hour is cheapest,’ but ‘which path best guarantees the future.’ Continued investment in the grid and renewable energy is the only way to avoid costly reconstruction of gas power. CfD provides institutional stability for this path. AR6 has proven its feasibility, and AR7 will determine whether the UK is willing to go further.n
