By Shane Oxer — Campaigner for fairer and affordable energy
Britain is being told that the energy transition is making the country cleaner, safer, and less exposed to global shocks. Ministers continue to present “clean power by 2030” as if it were synonymous with energy security.
But those are not the same thing.
The real test of an energy system is not what it looks like on an annual average, or on a ministerial press release, but how it performs in winter, under stress, when demand is high, renewable output is volatile, and global fuel markets tighten. On that test, the United Kingdom remains deeply exposed.
Household bills are forecast to rise again from July 2026, gas remains critical to winter electricity supply, solar output collapses in the darkest months, and major network reinforcements needed to connect new generation are already slipping into the 2030s. The country is not escaping dependency. It is rearranging it. [1][2][3][4]
Bills are rising again because Britain is still tied to volatile wholesale energy markets
The first sign of the system’s weakness is the price cap itself.
Cornwall Insight’s 31 March 2026 forecast put the July–September 2026 default tariff cap at £1,929.08 for a typical dual-fuel household, which is £288 higher than the April–June 2026 level of £1,641. Cornwall described that jump as being driven by wholesale-market volatility linked to disruption in the Middle East and the Strait of Hormuz. Its public forecast page also shows how sensitive the cap is to recent market movements: a later snapshot, based on 3 March close-of-play figures and published on its live forecast page, showed a July–September figure of £1,800.79. The exact number may move before Ofgem’s formal announcement, but the broader point is unmistakable: bills are rising again because Britain still prices a large part of household energy off volatile gas-linked wholesale markets. [1][5]
This matters politically because the public has repeatedly been told that the energy transition would shield households from shocks of this kind. Yet the structure of the system still transmits those shocks directly into domestic bills. Even after large-scale renewable deployment, the cap remains highly responsive to movements in gas and power markets. That means households are still paying the price for geopolitical risk, supply interruptions, and international trading conditions. Britain has not insulated itself from fossil-fuel volatility. It has simply added a more complex and more expensive system on top of it. [1][5]
Winter is where the true weakness of the system is exposed
The official winter-security position is always phrased carefully. NESO’s Winter Outlook for 2025/26 says electricity margins are expected to be adequate and within the Reliability Standard, with a base-case de-rated margin of 6.1GW, equivalent to about 10% of average cold-spell peak demand. That sounds reassuring, and in one narrow sense, it is: in a normal winter, the system operator does not expect widespread supply failure. But adequacy is not the same as independence or resilience. NESO’s own stress assumptions show that the system still depends on 6.9GW of net imports at tight times and counts the entire wind fleet as contributing only 3.9GW of de-rated firm capacity during stress conditions. In other words, winter reliability still rests on imports, gas, storage, and dispatchable backup , not on nameplate renewable capacity alone. [2][6]
That distinction is critical. A country can avoid blackouts and still be dangerously exposed to price spikes, foreign dependency, and supply stress. Britain’s winter problem is not simply the risk of the lights going out. It is that the system remains structurally tied to the very fuels and external dependencies that the political narrative implies are being left behind. When the weather is cold, dark, and wind output falls short, the country still turns back to gas and imports. That is not a transition to sovereignty. It is a transition managed around continuing vulnerability. [2][6]
Gas remains essential because it still fills the gap when renewable output drops
National Gas’s 2025 Gas Winter Outlook is unusually frank on this point. It forecasts lower overall gas demand for power than the previous winter, but it also notes that the previous winter saw an 18% increase in gas demand for power, driven by colder weather, lower wind output, and the closure of Britain’s last coal plant. More importantly, it states that during peak periods last winter, gas supplied extraordinarily large shares of electricity: on 10 December 2024, gas provided up to 73% of electricity. That single figure demolishes the fiction that gas has already become peripheral to the power system. It has not. At the moments of real stress, it remains central. [3]
This matters because winter reliability is determined by peak conditions, not annual political messaging. A grid can post impressive renewable output over a year and still rely overwhelmingly on gas at precisely the moments when reliability matters most. So long as gas performs that balancintg role, electricity prices will remain influenced by gas-market conditions, and Britain will remain vulnerable to the same external shocks ministers claim the transition is designed to avoid. The physical system has not changed nearly as much as the rhetoric suggests. [2][3]
Solar is not a serious winter answer, however often it is invoked politically
Solar generation can make a useful contribution across the year, but it is not a winter-peak solution in Britain. The most concrete published evidence comes from the government’s Feed-in Tariff load-factor analysis for 2024/25, which shows that the median solar PV load factor fell to 4.7% in October–December 2024/25, the weakest quarter of the year. The report also states that average sunshine hours in 2024/25 were at their lowest since 2012/13 and that solar’s annual median load factor fell to 9.2%, the lowest in the time series. This is consistent with the wider, obvious physical reality of the British climate: solar output collapses in the darkest months, exactly when demand is at its highest. [4]
That is why solar cannot honestly be presented as a meaningful answer to winter security. It may generate respectable volumes over spring and summer, but those are not the periods that determine whether an advanced industrial society has robust power when it most needs it. In winter, Britain needs firm power, dispatchable backup, and network capacity. Solar does not provide that. The expansion of ground-mounted solar across farmland therefore does far less for winter resilience than the public is often led to believe. [4]
Wind is important, but its usefulness is limited by intermittency and by a grid that is not ready
Wind contributes much more in winter than solar, and Britain’s record wind generation in late 2025 proves that. But there are two major caveats. First, wind output is variable, which is why NESO’s stress-case calculations reduce the whole wind fleet to 3.9GW of de-rated contribution in periods of system stress. Second, even where wind resources exist, power still has to be connected and transported. That is where the transition begins to run into the hard limits of infrastructure. NESO has said that the legacy grid-connections queue exceeded 700GW, with some projects waiting up to ten years for connection, which is precisely why connection reforms had to be introduced. [2][7]
This is not a small administrative issue. It is one of the central weaknesses in the entire “clean power” timetable. Britain is not only waiting for turbines and generation assets; it is waiting for substations, transmission corridors, cables, planning approvals, converters, and scarce high-voltage equipment. The result is a system in which projects can be announced long before they are capable of delivering useful power to consumers. The political system counts ambition; the electricity system counts deliverability. Those are not the same thing. [2][7]
The network needed to support the transition is already slipping beyond 2030
Ofgem’s December 2025 decision on major transmission reinforcements made this painfully clear. It approved updated target dates of December 2033 for GWNC and August 2034 for Eastern Green Link 3 and Eastern Green Link 4. These are not minor local upgrades. They are strategic projects designed to move large volumes of electricity and reduce the need to curtail generation. Ofgem explicitly linked the redesign and new dates to issues of deliverability and to the need to compete for scarce HVDC components in a global supply race. That means some of the infrastructure needed to carry large volumes of future renewable generation will not be ready until well after the government’s 2030 political milestone. [7]
Once that is understood, a great deal of the current narrative begins to look misleading. New generation can be consented, subsidised, and celebrated, but if the power cannot be moved to demand centres, the system remains constrained. That drives curtailment, balancing costs, and further dependence on existing dispatchable generation. In plain English: Britain is trying to build a new power system without the network backbone required to make it function properly, and the timetable slippage means the country will remain more dependent on gas and imports for longer than ministers prefer to admit. [2][7]
Import dependence is being normalised, but it is still a strategic weakness
Interconnectors can be useful. They provide flexibility, trading opportunities, and access to neighbouring markets. But dependence on imports is not the same as security. NESO’s winter planning assumes 6.9GW of net imports at tight times. That is a large embedded reliance on external power during periods of system stress. If surrounding markets are comfortable, that can work well. But in a continent-wide cold spell, or in periods of wider market disruption, imported electricity is neither guaranteed nor immune from scarcity pricing. Britain’s adequacy assumptions therefore rely in part on conditions beyond Britain’s direct control. [2][6]
That matters because the public debate often treats imported electricity as if it were simply another domestic system asset. It is not. Imports depend on other countries’ generation mix, other countries’ demand conditions, and the commercial logic of cross-border markets. An energy strategy built around heavy import reliance is, by definition, less sovereign than one built around secure domestic firm supply. Britain is increasingly presenting dependency as flexibility. That may be politically convenient, but it is not strategically honest. [2][6]
Foreign gas dependence remains one of the most serious unspoken risks
The same problem applies even more sharply to gas. National Gas has warned of “a growing reliance on imports” and a continuing decline in UK Continental Shelf supply. Norway remains the dominant external supplier, and Reuters reported in February 2026 that Shell’s Ormen Lange field suffered a compressor-related disruption that cut output by around 11.9 million cubic metres per day from a full capacity of 26 million cubic metres per day. That was a practical reminder that even highly reliable suppliers are not infallible. A single technical event can tighten supply and move markets. [3][8]
Norway’s scheduled maintenance programme is another reminder of how exposed the market remains. Reuters has repeatedly noted that Norwegian maintenance outages are closely watched by traders because they can influence European gas prices, and Britain remains heavily integrated into that market. Even when planned maintenance is routine, it reduces flexibility. In a calm market that may be manageable. In a geopolitical crisis, it can become far more serious. Britain’s winter exposure is therefore not an abstract theoretical risk. It is a market reality shaped by infrastructure, outages, and international events beyond domestic control. [8][9]
Energy shocks do not stay on bills , they spread through the whole cost of living
The failure of the current approach is not confined to electricity and gas invoices. Energy is a system-wide input, which is why rising wholesale prices quickly feed into food, transport, manufacturing, and household inflation more broadly. Reuters reported on 1 April 2026 that the Food and Drink Federation had revised its food-inflation forecast sharply upwards, warning that UK food inflation could reach 9% to 10% by the end of 2026 because of disruption linked to the Iran war and the Strait of Hormuz. The FDF’s own statement said food and drink manufacturing is unusually exposed because energy is required at every stage of production, while fertiliser, shipping, packaging, and fuel costs were all rising simultaneously. [9][10]
This is where the political consequences become most severe. When energy policy leaves the country exposed to volatile fuel and import markets, the damage does not stop with household heating and electricity. It reaches the price of bread, vegetables, dairy, logistics, and the basic weekly shop. The FDF also noted that smaller producers buying energy on the spot market were already experiencing cost spikes, while agriculture faced rising red-diesel and fertiliser costs. In other words, an unstable energy system quickly becomes an unstable cost-of-living environment. Britain is not only facing an energy affordability problem. It is facing the broader inflationary consequences of energy insecurity. [9][10]
The contradiction at the heart of the current policy is becoming impossible to hide
The contradiction is now stark. Britain is told it is moving away from fossil-fuel dependence, but gas still provides huge shares of electricity at peak winter moments. It is told it is becoming more secure, but its winter margin assumes large import availability. It is told renewable build-out is the answer, but strategic grid upgrades are slipping into 2033 and 2034. It is told solar is part of the solution, but solar load factors collapse to the low single digits through the darkest months. And it is told bills will fall in the long run, even as Cornwall Insight forecasts another sharp rise this summer. [1][2][3][4][7]
That is why public trust is collapsing. The issue is no longer whether low-carbon generation can play a role; plainly it can. The issue is whether the current policy framework has honestly confronted the engineering, infrastructure, and market realities of winter security. On the evidence, it has not. The country is still critically reliant on gas, still exposed to imported power and imported fuel, still waiting on crucial transmission reinforcements, and still seeing household bills track international shocks. This is not a stable path to energy sovereignty. It is a fragile halfway house that leaves the public paying for both systems at once. [1][2][3][7]
Conclusion
Britain’s problem is not simply that the transition is expensive. It is that the transition is being sold as security before the conditions for real security exist. The nation still depends on gas when winter demand bites. It still leans on imports in tight periods. It still lacks the network infrastructure required to fully utilise the generation being promised. And it remains vulnerable to geopolitical turmoil, maintenance outages, and wholesale-price spikes that flow directly into household budgets and food prices.
That is the truth ministers will not state plainly: Britain has not replaced dependency. It has repackaged it. Until the country builds a system based on genuine domestic resilience — firm supply, realistic winter planning, and infrastructure delivered before political promises — households will continue to live under the threat of higher bills, tighter winters, and repeated cost-of-living shocks. [1][2][3][7][9]
Footnotes
[1] Cornwall Insight, Fall in Wholesale Market Lowers Price Cap Forecasts, but Big Rises Still Expected in July, 31 March 2026; Cornwall Insight, Predictions & Insights into the Default Tariff Cap.
[2] National Energy System Operator, Winter Outlook 2025/26 and related Winter Outlook material, including 6.1GW base-case de-rated margin, 6.9GW net imports assumption, and 3.9GW de-rated wind contribution.
[3] National Gas, 2025 Gas Winter Outlook press release and Winter Outlook materials, including tighter margins, growing import reliance, and gas supplying up to 73% of electricity on 10 December 2024.
[4] Department for Energy Security and Net Zero, Feed-in Tariff load factor analysis 2024/25 and related FIT load-factor publications, showing a 4.7% median solar PV load factor in October–December 2024/25 and a 9.2% annual median in 2024/25.
[5] Reuters, Britain’s energy price cap to rise 18% in July, Cornwall Insight says, 31 March 2026.
[6] NESO, Early View of Winter 2025/26 and Winter Outlook 2025/26, on adequacy being within the Reliability Standard but reliant on imports, gas availability, batteries, and de-rated assumptions.
[7] Ofgem, Ofgem agrees early investment and updated dates for proposed electricity superhighways, 9 December 2025, setting new target dates of December 2033 for GWNC and August 2034 for EGL3/EGL4.
[8] Reuters, Shell inspects subsea equipment at curtailed Ormen Lange gas field, 26 February 2026; Reuters reporting on Norwegian maintenance outages and market sensitivity.
[9] Reuters, UK food inflation heading towards 10% due to Iran war, industry says, 1 April 2026.
[10] Food and Drink Federation, FDF revises food inflation forecast to at least 9% by the end of 2026, 1 April 2026; FDF, Food and drink inflation at 3.3% in February 2026, 25 March 2026.
Reference list
Cornwall Insight, Fall in Wholesale Market Lowers Price Cap Forecasts, but Big Rises Still Expected in July, 31 March 2026.
Cornwall Insight, Predictions & Insights into the Default Tariff Cap.
Department for Energy Security and Net Zero, Feed-in Tariff load factor analysis 2024/25, 18 December 2025.
Food and Drink Federation, FDF revises food inflation forecast to at least 9% by the end of 2026, 1 April 2026.
Food and Drink Federation, Food and drink inflation at 3.3% in February 2026, 25 March 2026.
National Energy System Operator, Winter Outlook 2025/26 and Early View of Winter 2025/26.
National Gas, National Gas Publishes 2025 Gas Winter Outlook and Gas Winter Outlook 2025.
Ofgem, Ofgem agrees early investment and updated dates for proposed electricity superhighways, 9 December 2025.
Reuters, Britain’s energy price cap to rise 18% in July, Cornwall Insight says, 31 March 2026.
Reuters, Shell inspects subsea equipment at curtailed Ormen Lange gas field, 26 February 2026.
Reuters, UK food inflation heading towards 10% due to Iran war, industry says, 1 April 2026.
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