Great Britain’s Electricity Mix: A Shift Toward Imports and Clean Energy

On April 26, 2026, Great Britain’s electricity grid reached a milestone: for the first time, imports accounted for 21.6% of the nation’s electricity supply, surpassing nuclear energy, which contributed 19.5%. This shift reflects broader trends in the UK’s energy landscape, where reliance on foreign power has grown alongside efforts to decarbonize the grid. The data, reported by the National Energy System Operator (NESO), underscores the balancing act between energy security, affordability, and sustainability as the country transitions toward a net-zero future.

The Rise of Electricity Imports

Great Britain has historically relied on a mix of domestic generation—coal, gas, nuclear, and renewables—to meet its electricity demand. However, in recent years, imports have played an increasingly critical role. According to NESO’s latest figures, 21.6% of the nation’s electricity on April 26 came from cross-border interconnectors, primarily linking the UK to France, Norway, Belgium, and the Netherlands. This marks a significant increase from previous years, where imports typically hovered around 10-15% of total supply.

The growth in imports is driven by several factors:

• Cost competitiveness: Electricity from European markets, particularly France’s nuclear-heavy grid and Norway’s hydropower, often undercuts the price of domestic generation, especially during periods of high demand or low renewable output.
• Grid flexibility: Interconnectors allow the UK to balance supply and demand in real time, importing power when domestic generation falls short and exporting excess renewable energy when conditions are favorable.
• Decarbonization goals: As the UK phases out coal and reduces reliance on gas, imports—particularly from low-carbon sources like French nuclear and Norwegian hydro—facilitate maintain grid stability while lowering emissions.

However, the rising dependence on imports has raised concerns about energy security. The Nuclear Industry Association (NIA) recently warned that the UK is “more reliant on imported electricity than at any point on record,” with an average of 16% of supply coming from overseas in 2026. While interconnectors provide flexibility, they also expose the UK to geopolitical risks, such as energy disputes or supply disruptions in neighboring countries.

Nuclear’s Declining Share

Nuclear energy, long a cornerstone of Britain’s low-carbon electricity supply, has seen its share of the mix decline in recent years. On April 26, nuclear provided 19.5% of the nation’s electricity, down from its historical peak of around 25% in the early 2010s. This trend is largely due to the aging fleet of UK nuclear plants, many of which are scheduled for decommissioning in the coming decade.

The UK currently operates eight nuclear power stations, with a combined capacity of around 6.5 gigawatts (GW). However, several of these plants—including Hunterston B, Hinkley Point B, and Dungeness B—have already shut down or are set to close by 2028. The only novel nuclear project under construction, Hinkley Point C in Somerset, is not expected to come online until at least 2027, leaving a potential gap in low-carbon generation.

To address this, the government has outlined plans to build up to 24 GW of new nuclear capacity by 2050, including small modular reactors (SMRs). However, progress has been slow, with regulatory hurdles, financing challenges, and public opposition delaying projects. In the meantime, the UK is increasingly turning to imports and renewables to fill the gap.

The Renewable Energy Surge

While imports and nuclear have dominated recent headlines, renewables continue to play an expanding role in Great Britain’s electricity mix. On April 26, wind power generated 28.3% of the nation’s electricity, making it the single largest source of power for the day. Solar contributed an additional 5.2%, while biomass and hydro accounted for smaller shares.

The growth of renewables has been driven by significant investments in offshore and onshore wind, as well as solar farms. The UK now boasts the world’s largest offshore wind capacity, with over 14 GW installed as of 2026. The government’s Clean Power 2030 (CP30) initiative aims to quadruple offshore wind capacity to 50 GW by the end of the decade, alongside a tenfold increase in solar capacity to 70 GW.

However, the intermittent nature of wind and solar power presents challenges for grid stability. NESO’s Operability Strategy Report (OSR) highlights the need for “flexibility solutions” to manage periods of low renewable output. These include battery storage, demand-side response programs, and—controversially—increased reliance on imports and gas-fired power stations as backup.

NESO’s Role in Managing the Transition

The National Energy System Operator (NESO) plays a central role in navigating Great Britain’s energy transition. Established as a public corporation under the Department for Energy Security and Net Zero, NESO is responsible for ensuring the reliable and efficient operation of the electricity system, from forecasting demand to managing grid stability.

Key initiatives led by NESO include:

• Capacity Market: The UK’s Capacity Market ensures reliable electricity supply by providing stable revenue to power providers, including gas, nuclear, and storage operators. Recent auctions have secured significant capacity at lower prices, supporting both energy security and clean energy goals.
• Demand Flexibility Service (DFS): Following approval from Ofgem, NESO has expanded its DFS to encourage year-round participation from consumers and businesses. The program offers incentives for reducing electricity use during peak periods, helping to balance supply and demand without relying solely on additional generation.
• Electricity Markets Roadmap: NESO’s Electricity Markets Roadmap outlines proposed reforms to address operability challenges, such as the integration of more renewables and the need for flexible backup capacity. The roadmap includes measures to improve grid connections, enhance market signals for storage, and streamline the approval process for new projects.

NESO’s transitional Regional Energy Strategic Plan (tRESP) also aims to coordinate local and national energy planning, ensuring that infrastructure investments align with broader decarbonization goals.

What’s Next for Great Britain’s Electricity Mix?

The events of April 26, 2026, offer a snapshot of Great Britain’s evolving electricity landscape. As the country moves toward its 2035 net-zero electricity target, several trends are likely to shape the future:

• Continued growth in renewables: Wind and solar are expected to dominate the electricity mix by the 2030s, supported by advances in storage technology and grid management.
• Increased reliance on imports: While interconnectors will remain critical for balancing supply and demand, the UK will need to diversify its import sources to mitigate geopolitical risks.
• Nuclear’s uncertain future: The success of new nuclear projects, including SMRs, will determine whether nuclear can regain its share of the mix or continue its decline.
• Market reforms: NESO’s proposed changes to the electricity market, such as Reformed National Pricing (RNP), aim to create a more flexible and efficient system that can accommodate higher levels of renewables while maintaining reliability.

For consumers, the shift toward imports and renewables could lead to lower electricity prices in the long run, as the cost of wind and solar continues to fall. However, short-term volatility remains a risk, particularly if gas prices spike or interconnector capacity is constrained. NESO’s efforts to enhance grid flexibility—through storage, demand response, and market reforms—will be critical in managing these challenges.

Key Takeaways

• On April 26, 2026, imports accounted for 21.6% of Great Britain’s electricity supply, surpassing nuclear (19.5%) for the first time.
• Wind power was the largest single source of electricity on that day, generating 28.3% of the mix.
• The UK’s reliance on imports has grown due to cost competitiveness, grid flexibility, and decarbonization goals, but it also raises energy security concerns.
• Nuclear’s share of the mix has declined due to the aging fleet of power stations, with only one new plant (Hinkley Point C) under construction.
• NESO is leading efforts to modernize the grid, including market reforms, demand flexibility programs, and strategic planning for a net-zero future.

FAQ

Why is Great Britain importing more electricity?

Great Britain is importing more electricity due to a combination of factors, including the cost competitiveness of foreign power (particularly from France and Norway), the need for grid flexibility to balance intermittent renewables, and the phase-out of coal and aging nuclear plants. Imports help maintain supply during periods of high demand or low renewable output.

Is the UK’s reliance on imports a risk to energy security?

Yes, increased reliance on imports exposes the UK to potential risks, such as geopolitical disputes, supply disruptions in neighboring countries, or price volatility in European energy markets. However, imports also provide flexibility and help integrate more renewables into the grid. NESO and the government are working to diversify import sources and enhance domestic energy security through storage, demand response, and new generation capacity.

What role does nuclear energy play in the UK’s future electricity mix?

Nuclear energy is expected to play a smaller but still important role in the UK’s future electricity mix. The government has set a target of 24 GW of new nuclear capacity by 2050, including large-scale plants and small modular reactors (SMRs). However, progress has been slow due to regulatory, financial, and public acceptance challenges. In the short term, the UK will likely continue to rely on imports and renewables to fill the gap left by retiring nuclear plants.

How is NESO addressing the challenges of integrating more renewables?

NESO is implementing several initiatives to address the challenges of integrating more renewables, including:

• Demand Flexibility Service (DFS): Encouraging consumers and businesses to reduce electricity use during peak periods.
• Electricity Markets Roadmap: Proposing market reforms to improve grid connections, enhance signals for storage, and streamline project approvals.
• Capacity Market: Ensuring reliable backup capacity, including gas, nuclear, and storage, to balance intermittent renewables.
• Transitional Regional Energy Strategic Plan (tRESP): Coordinating local and national energy planning to align infrastructure investments with decarbonization goals.

What can consumers expect in terms of electricity prices?

In the long run, the shift toward renewables and imports could lead to lower electricity prices, as the cost of wind and solar continues to fall. However, short-term price volatility remains a risk, particularly if gas prices spike or interconnector capacity is constrained. Consumers may also see new opportunities to reduce their bills through demand flexibility programs, such as NESO’s DFS, which rewards users for reducing consumption during peak periods.