Britain could experience periods of completely zero-carbon electricity for the first time in its history this summer, a landmark moment driven by a record surge in wind and solar power.
This milestone is a crucial stepping stone towards the government’s legally binding climate goals. The national energy system operator (Neso) is at the heart of managing this transition, with a target to run the grid without fossil fuels for at least 30 minutes by the end of 2025. The broader ambition, as outlined in the government’s “Clean Power 2030” strategy, is for 95% of electricity to come from low-carbon sources by 2030, with a maximum of 5% from unabated gas, paving the way for a 100% zero-carbon system by 2035.
The renewable surge making it possible
The potential for carbon-free power is being created by unprecedented growth in renewable generation. In 2025, renewables supplied 47% of the UK’s electricity, with wind generation hitting a record 87 TWh. Solar capacity also reached 21 GW in the third quarter of last year. Great Britain has already achieved periods of running on 100% clean power, logging a record 87 hours in 2025 to date.
However, this success presents a new challenge for grid managers. On very sunny or windy days, particularly during weekends when demand is lower, there could be more renewable energy being generated than the electricity grid immediately needs. To prevent overloading the network, the system operator has historically had to pay wind and solar farms to turn off, a costly process known as curtailment.
How your dishwasher will help balance the grid
The solution being rolled out this summer focuses not on reducing supply, but on smartly increasing demand. The National Energy System Operator plans to work with energy suppliers to incentivise households and businesses to shift their power usage. The concept, known as demand-side response (DSR), means charging electric vehicles, running dishwashers, or putting on laundry during peak renewable generation times.
Major suppliers including Octopus Energy and British Gas have confirmed they will take part. For consumers, this could mean discounted energy tariffs for using power when it’s greenest. For the system, it avoids or reduces the multi-million pound costs of paying renewable generators to switch off. Neso views this approach as vital for integrating intermittent renewable generation, offering a pathway to cost savings and lower carbon emissions.
This strategy is increasingly important as electricity demand evolves. The mass adoption of electric vehicles and heat pumps is not seen as a primary concern for total energy consumption, but their timing is critical. Smart charging for EVs and intelligent management of heat pumps are being developed to align with renewable availability. Studies suggest homes with heat pumps may put less strain on the grid than feared, with varied peak usage times actually reducing overall system stress.
Overcoming the grid bottleneck
Despite the progress, significant hurdles remain. The most pressing is the capacity of the physical electricity grid itself. Rapid growth in approved renewable projects and rising demand from electrification are creating bottlenecks, with grid connection delays hindering new projects. The National Grid ESO has acknowledged the challenge but stated the transition will be managed within the grid’s capabilities, reliant on substantial investment in flexibility and transmission upgrades.
Energy storage is a cornerstone of the solution. The government is targeting 23-27 GW of battery storage capacity by 2030, with a growing pipeline of battery energy storage systems (BESS), often on repurposed former fossil fuel sites. The development of long-duration energy storage is also being explored as a key enabler for a secure and cost-effective low-carbon system.
The shift extends beyond homes to industry. The UK’s Industrial Decarbonisation Strategy aims to drastically cut industrial emissions by 2035, moving away from fossil fuel combustion towards hydrogen, electrification, and carbon capture. Success here hinges on reducing high industrial electricity prices and streamlining grid connections for major projects.
The journey to a zero-carbon grid relies on this multi-pronged approach: harnessing record renewables, incentivising consumers to use power wisely, building vast storage capacity, and upgrading the grid itself. While the sight of a carbon-free grid for minutes or hours this summer will be symbolic, it underscores the complex, nationwide engineering and behavioural shift now underway.
