Electricity has a slightly strange habit of looking exactly the same whatever it costs. The kettle boils, the lights come on and your EV charges, even while the cost of producing and buying that electricity is moving behind the scenes.
There is no single lever setting the price. It depends on how much electricity people need, what generation is available, what fuels cost, the weather, imports and what is happening in wider energy markets.
You do not need to become an energy trader to make sense of it. A few basics explain why gas prices can still matter in a grid with more renewable power, why events elsewhere can affect costs here, and why a wholesale price change does not simply appear at a public charger the next morning.
Where does the UK’s electricity come from?
The electricity reaching your home or car does not arrive labelled wind, solar, gas or nuclear. Great Britain draws power from a mix of sources, including wind, solar, nuclear, gas, biomass and hydro, as well as electricity imported through interconnectors with neighbouring countries.
That mix changes all the time. A windy day can increase wind generation. Solar naturally varies with daylight and weather. Nuclear provides a steadier source of power, while gas can be used when more electricity is needed. Imports can also help fill the gap.
The longer-term picture has changed too. Ofgem reports that renewables accounted for 16% of Great Britain's electricity generation in 2015 and 44% in 2025. Over the same period, fossil fuels fell from 52% to 29%.
Government figures give a more recent snapshot too. Between April and June 2026, renewables provided 50.8% of electricity generated by Major Power Producers, compared with 32.0% from gas and 16.3% from nuclear.
Why does that matter to the price? Because each source has different costs and availability. Wind and solar do not require fuel, but their output depends on conditions. Gas can be used when more electricity is needed, but its fuel price can move with global markets.
What determines electricity prices?
Think of Great Britain’s electricity system as a constant balancing job. At every moment, enough power has to be available to match what homes, businesses, trains, factories and everything else are using.
If demand rises, or cheaper sources of electricity generation are not available, the system may need to rely on more expensive sources to produce enough electricity to meet demand. When demand is lower and plenty of lower-cost generation is available, electricity can be cheaper to produce, which can help bring down the wholesale price.
The wholesale market is where suppliers buy the electricity they need. NESO says prices can move with demand, fuel costs and the amount of wind and solar generation available.
So, what determines electricity prices? In practice, it is the combination of demand, generation, fuel costs, availability and imports, all moving at the same time.
Why is the electricity price linked to gas?
Here is the bit that often raises eyebrows. If Britain is generating more electricity from renewables, why can a rise in gas prices still push electricity prices up?
Lower-cost generation is generally used first. But the system still needs enough electricity to meet demand. If more expensive gas generation is needed to supply the final part of that demand, it can influence the wholesale price for that period.
Ofgem explains that gas can therefore set the marginal wholesale electricity price even while cheaper renewable electricity is also on the system. Put simply, the price is influenced by what it costs to get enough power onto the grid to meet demand, not just by the average cost of every source.
More renewable generation can reduce how much gas is needed, but it does not mean gas prices stop mattering overnight.
How can events elsewhere affect energy prices?
Britain does not buy gas in a bubble. Gas is traded internationally, so changes in global supply and demand can affect wholesale prices here.
Weather is one example. Colder conditions can increase demand for gas for heating. Global demand for liquefied natural gas can affect the price Britain pays for imported supply. Disruption to production, pipelines or shipping routes can add further pressure.
We have seen that in 2026. In August, Ofgem said higher wholesale gas prices linked to the ongoing conflict in the Middle East were a key reason for the October to December 2026 household energy price cap increase. Ofgem also described volatile global gas markets as a major driver of recent price changes.
That is a useful example of how something happening thousands of miles away can reach the energy market here. It does not mean every headline becomes tomorrow's charging price. It is one influence among several.
Does a wholesale price change immediately affect what you pay?
Not always.
A wholesale price is better thought of as one ingredient in the final price, not the price tag itself. Household bills and public charging tariffs can also reflect network costs, operating costs, taxes, infrastructure and the way energy has been bought.
Energy companies can also buy electricity and gas in advance, known as hedging. Ofgem notes that this can create a delay between a movement in the wholesale market and the price consumers eventually see.
So you will not usually see this afternoon's wholesale price copied onto your tariff tomorrow morning. Wholesale markets matter, but they are only part of the picture.
What does this mean for EV charging?
The energy market may be complex, but charging your EV doesn’t need to be. The useful takeaway is simpler: the wider energy market helps shape the cost of electricity, but it does not dictate the price at a charger minute by minute.
Public charging operators also have other costs and purchasing arrangements, and they decide how their tariffs are structured. That is why charging prices do not necessarily move in the same way, or at the same time, as wholesale electricity prices.
For drivers, the useful thing to remember is that electricity costs can move for several reasons, and those changes may take time to reach charging prices or may show up differently from one tariff to another.
Once that bigger picture makes sense, the next question is a more practical one: can the time you charge make a difference? That is where off-peak electricity and time-of-use tariffs come in.
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