Ofgem’s price cap will rise by £63 in October, the third increase this year. Now a separate UK-EU energy deal could add another layer of cost to household bills, this time via a cross-border subsidy mechanism. The Telegraph reports that British taxpayers may be asked to underwrite French electricity prices under Sir Keir Starmer’s proposed agreement, as reported by The Telegraph. The mechanism works through shared interconnector costs: when French demand spikes, say, during a cold snap, UK generators would be paid to export power, and the network charges would be socialised across all UK billpayers.
Who pays, and who doesn’t
The subsidy would not appear as a direct line on your bill. Instead, it would be folded into the network charges that National Grid levies on suppliers, who then pass them on to households. Ofgem data from 2024 shows network charges already account for about £320 a year on a typical 3-bed semi using 3,100 kWh of electricity. An extra £15 on top, roughly 5%, may not sound catastrophic, but it compounds the existing upward trend. Households on prepayment meters or in low-income areas will feel it hardest because they already pay a higher standing charge. The Energy Saving Trust warns that any cross-subsidy must be transparently allocated, not buried in the ‘other costs’ line of the price cap.
What this misses
The deal’s defenders argue that greater interconnection lowers overall prices by smoothing supply, when UK wind blows and French nuclear is offline, we export cheap power; when the reverse happens, we import cheap French nuclear. But the catch is that the cost of building and maintaining those interconnectors, and the profit guarantees for operators, are already socialised. Adding a further subsidy for French consumers turns a mutually beneficial trade into a one-way transfer. The government has not published a cost-benefit analysis. Officials told The Telegraph only that “discussions are ongoing” and that “any agreement must be fair to UK consumers.” That is not the same as a guarantee.
What it means for your home upgrades
For Axiom readers, the immediate implication is not panic but planning. If electricity becomes marginally more expensive relative to gas, and the ratio already favours gas for heating, then the case for heat pumps weakens unless you also install solar PV to offset your own consumption. A typical 3-bed semi with a heat pump uses about 4,500 kWh of electricity annually for heating. Solar panels generating 3,500 kWh per year could cover most of that, but only if you have battery storage to use the power in the evening. Insulation remains the cheapest first step: loft insulation at £300–£400 can cut heat loss by 25%, reducing both your gas and electricity bills. The EPC rating impact is clear: a band D home moving to band C typically saves £200–£300 a year on energy costs, regardless of which way the grid charges move.
What you can do now
Check your current electricity tariff. Fixed-rate deals are still available at rates below the October price cap, but they are closing fast. Use the Energy Saving Trust’s tariff comparison tool before the end of September. If you are considering solar or a heat pump, get quotes now, the grant schemes (Boiler Upgrade Scheme, ECO+) have limited funding per year, and installer lead times are already stretching into 2026. Ofgem’s consultation on the cross-subsidy mechanism is expected in autumn 2025; submit your view via their website if you want a say. The bottom line: this deal may add £15 a year, but poor insulation costs you ten times that. Fix the house first.
Frequently Asked Questions
No, the deal does not directly change EPC ratings. But if electricity prices rise relative to gas, homes with electric heating (including heat pumps) may see higher running costs, which the EPC calculation does not fully capture. Improving insulation and adding solar PV will still improve your EPC band regardless of the deal.
The most effective way is to generate and store your own electricity. Solar panels with battery storage can cut your grid imports by 60–80%, reducing the impact of network charge increases. For most homes, a 4 kW solar system costing £6,000–£8,000 pays back in 10–12 years at current prices. Pairing it with a heat pump also helps, but only if your home is well insulated first.
