The public is being given a convenient explanation for Britain’s latest energy-price shock: Iran, the Middle East and wholesale gas.
There is truth in it. The Middle East conflict has pushed winter gas contracts higher, and Cornwall Insight now forecasts the domestic energy price cap rising by about 4% in October to £1,729 for its newly defined “typical” household.
But that is only the commodity-price trigger.
It is not an adequate explanation for why Britain has become such an extraordinarily expensive electricity system to operate.
Behind the headlines sits another bill — one measured not in pence per therm but in hundreds of millions of pounds every month.
It is the bill for constraining generation we cannot move.
The bill for turning generators down.
The bill for turning other generators up.
The bill for voltage control.
The bill for inertia.
The bill for reserve.
The bill for maintaining margins.
And increasingly, the bill for compensating for an electricity system in which generation has been built faster than the infrastructure needed to integrate it efficiently.
This isn’t speculation.
NESO’s own figures say it.
£302 million in June — while gas prices were falling
June 2026 ought to destroy the simplistic argument that Britain’s electricity-cost problem is merely the price of gas.
NESO records that day-ahead gas prices fell from 117.6p/therm in May to 109.2p/therm in June. Day-ahead electricity prices also fell, from £103.4/MWh to £100.7/MWh.
Yet Britain’s balancing bill that month was:
£302 MILLION
That was £24 million above NESO’s benchmark.
Constraint costs alone reached £225.3 million, increasing by £56.7 million in a single month.
Seven June days cost more than £15 million each to balance.
Another five exceeded £10 million.
The average was approximately:
£10.1 MILLION A DAY.
On 28 June, balancing the electricity system cost £23.4 million in a single day.
Around 85% of that day’s expenditure was constraint management, and NESO says 93% of the constraint element related to thermal constraints.
Gas prices were falling.
Yet the system was burning through hundreds of millions of pounds trying to make the electricity network work.
That distinction matters.
Then came another £302 million in July
Perhaps June was an aberration?
It wasn’t.
NESO’s latest figures show another £302 million of balancing costs in July 2026 — £129 million more than July 2025.
On 2 July alone, Britain’s electricity-balancing bill reached:
£25.4 MILLION.
And this time NESO says 95% of the expenditure was constraint management.
Why?
NESO records exceptionally high wind generation combined with network outages that reduced the ability to move electricity southwards.
This is the issue policymakers cannot continue hiding behind a discussion about international gas markets.
Britain increasingly has a location and infrastructure problem.
Power can be generated where the network cannot efficiently transport it.
Consumers then pay for the consequences.
NESO admits renewable generation is increasing other system costs
The most revealing evidence comes from NESO itself.
In June it reported voltage constraints of £34.3 million and stated that because of higher renewable generation — “especially embedded solar” — more synchronous generating units had to be procured through the Balancing Mechanism.
NESO also said inertia spending increased for similar reasons.
Then in July voltage costs increased to £40.8 million, while inertia reached £11.1 million.
Again NESO attributed the increase largely to the effects of higher renewable generation on the electricity system, especially embedded solar.
Read that carefully.
Consumers have been told for years that adding ever greater amounts of wind and solar will drive electricity costs down.
Yet the system operator is simultaneously telling us that higher renewable penetration can require additional expenditure procuring synchronous generation to provide electrical services such as voltage control and inertia.
That does not mean renewable electricity produces no value.
It means the political debate has too often confused the cost of producing a megawatt-hour with the cost of operating an electricity system capable of delivering that megawatt-hour securely where and when it is required.
Those are not the same thing.
And households pay for the whole system.
We are paying to produce electricity — and paying because we cannot move it
June produced 4.6 TWh of wind generation.
But NESO also records 709 GWh of wind curtailment during the month — up 20% from May — largely because of increased wind output and network outages.
July recorded another 610 GWh of wind curtailment.
This gets to the heart of Britain’s energy-policy failure.
Installing another turbine is not the same thing as creating another usable megawatt of electricity at the point and time consumers require it.
Installing another solar farm is not the same thing as creating firm winter capacity.
And installing enormous quantities of weather-dependent generation before the necessary transmission infrastructure, flexibility and stability arrangements are ready creates costs elsewhere in the system.
NESO itself now says balancing costs are increasing from around £2 billion a year towards potentially as much as £8 billion by 2030.
Its explanation could hardly be clearer: more than 60% relates to thermal constraints, typically arising when large amounts of wind generation in the north cannot reach demand in the south.
NESO summarises the problem in brutally simple terms:
the cables do not yet exist.
Think about what that means.
The country pursued generation first.
The network is now racing to catch up.
And consumers are paying during the gap.
This is what happens when the destination is decided before the engineering is ready
The government’s Clean Power 2030 programme is not a modest adjustment to the existing electricity system.
It is an attempt to transform it at extraordinary speed.
Government documents describe around £40 billion of largely private investment per year to 2030 associated with the Clean Power programme. The government’s solar roadmap targets 45–47 GW of solar by 2030, while its own Clean Power plan recognises that Britain could require 40–50 GW of dispatchable and long-duration flexible capacity to support the electricity system during periods of low renewable generation.
That exposes the contradiction.
We are building enormous amounts of weather-dependent generating capacity while simultaneously acknowledging that enormous amounts of dispatchable or long-duration capacity will still be needed when the weather does not cooperate.
At other times we have too much renewable generation in the wrong place and must constrain it because transmission capacity is inadequate.
Then, during low-demand periods with large quantities of embedded solar, NESO may still have to procure synchronous generation for voltage and inertia.
This isn’t an electricity system becoming simpler and cheaper.
It is becoming more complex to operate.
And complexity costs money.
Balancing is necessary. £8 billion should terrify policymakers.
Every electricity system requires balancing.
It would therefore be wrong to describe every pound NESO spends as “waste”.
But that defence only goes so far.
When NESO itself projects balancing costs potentially reaching £8 billion annually by 2030, predominantly because of transmission constraints, policymakers cannot simply shrug and describe the whole amount as the unavoidable cost of keeping the lights on.
The relevant question is:
How much of that cost results from creating a generation fleet faster than Britain can build the network required to accommodate it?
That is the question DESNZ should answer.
That is the question Ofgem should answer.
And that is the question Parliament should be asking before approving another wave of generation dependent upon grid infrastructure that may not be ready for years.
And then Ofgem changed the yardstick
There is another extraordinary part of this story.
At precisely the time household energy affordability should be subjected to greater scrutiny, Ofgem has changed what constitutes a “typical household”.
Before 1 July 2026, Ofgem’s headline annual bill assumed:
2,700 kWh of electricity
and
11,500 kWh of gas.
From 1 July it reduced those assumptions to:
2,500 kWh of electricity
and
9,500 kWh of gas.
The gas assumption has therefore been reduced by about 17.4%.
Electricity by about 7.4%.
Ofgem says this reflects changing household consumption and explicitly states that changing the benchmark does not change the rates consumers actually pay.
Precisely.
And that is why the presentation matters.
Using the previous consumption benchmark, the July price cap was:
£1,862
Using the new lower-consumption benchmark, the headline became:
£1,663
Same underlying tariff rates.
Different assumed household.
A £199 reduction in the headline number produced by changing the amount of energy the illustrative consumer is assumed to use.
Let us therefore be absolutely clear:
They did not reduce the price by £199. They reduced the yardstick.
Ofgem openly publishes both figures, so this is not evidence of a secret manipulation.
But the political and presentational effect is impossible to ignore.
A household hearing “£1,663” can reasonably believe that represents the current cost of energy.
Yet calculated on the previous benchmark the same cap is £1,862.
That is why energy affordability should increasingly be discussed using unit rates, standing charges and actual household consumption, not merely a changing hypothetical annual figure.
Even Ofgem says operating costs rose because the benchmark changed
There is a further irony.
Ofgem’s July cap document states that core operating costs increased by 5% because of changes in the benchmark consumption figures.
It also says indexed components including headroom, supplier EBIT and VAT increased by an average 14% as the overall cap increased.
So while the new consumption benchmark produces a lower headline annual number, parts of the cap methodology continue moving underneath it.
This is exactly why the public deserves the entire bill to be explained.
Not a slogan.
Not a price-cap headline.
Not “Iran did it”.
The whole system.
And NESO’s June operation is already under regulatory scrutiny
There is also the question of system operation itself.
During the June heat event, NESO issued Electricity Margin Notices for 24 and 26 June.
Ofgem has now formally required a comprehensive review examining the drivers of those system stresses, NESO’s actions, market actions, operational decision-making, record keeping, security status and lessons for future operation.
Ofgem is separately overseeing an independent investigation into whistleblowing allegations concerning operational decision-making and record keeping at NESO. Those allegations have not been proven, and they should not be reported as established wrongdoing.
But the existence of the investigations makes one thing clear:
NESO’s management of these events is legitimately open to scrutiny.
It cannot simply be assumed that every cost was inevitable and every operational decision optimal.
Stop blaming the commodity. Start auditing the system.
Yes, Middle Eastern instability has increased gas prices.
Yes, Britain remains exposed to international gas markets.
But after years of political promises that an enormous renewable transformation would make energy cheaper and protect consumers from volatile fossil-fuel markets, that explanation creates an uncomfortable question of its own:
Why are British consumers still so exposed to gas that one geopolitical shock can supposedly wipe out a tax reduction — while simultaneously paying hundreds of millions of pounds every month to balance an increasingly constrained electricity system?
June: £302 million.
July: £302 million.
28 June: £23.4 million.
2 July: £25.4 million.
June wind curtailed: 709 GWh.
July wind curtailed: 610 GWh.
July voltage costs: £40.8 million.
July inertia costs: £11.1 million.
And balancing costs potentially heading towards £8 billion a year by 2030.
Those numbers are not produced by rhetoric.
They come from Britain’s own system operator.
The scandal is not that Britain needs to balance its electricity grid.
The scandal is pursuing an electricity architecture whose own operator warns could become vastly more expensive to balance because generation and transmission have been allowed to develop out of sequence.
We have built generation where the cables are not ready.
We curtail electricity when it cannot be transported.
We procure synchronous generation when the system needs stability.
We maintain reserve for periods when intermittent generation disappears.
We expand the transmission system at enormous cost.
And after all of this, households are told their bills are rising because of gas.
That explanation is no longer good enough.
Britain needs an independent whole-system cost audit covering generation subsidies, CfDs, constraint payments, balancing, curtailment, voltage, inertia, reserve, interconnectors, capacity mechanisms, transmission reinforcement and the cost of backup generation.
Only then will consumers know what this energy experiment is truly costing them.
Until that happens, every minister who claims renewables are “cheap” should be required to answer one simple question:
Cheap at the turbine or solar panel — or cheap after we have paid for everything required to make the electricity system actually work?
Those are two completely different things.
And British households are paying for the difference.
Shane Oxer. Campaigner for fairer and affordable energy
SAY NO TO THE DESTRUCTION OF OUR LAND 
Leave a comment