Reform UK’s solar threat could cost homeowners £800 a year

The solar industry has fired a warning shot at Reform UK after the party threatened to scrap net-zero subsidies and reverse green energy policies. The claim: household energy bills could double. That is not hyperbole from a trade body, it is a direct arithmetic consequence of removing solar generation from the grid.

As reported by The Eco Experts, the Solar Energy UK group calculated that abandoning renewables expansion would push wholesale electricity prices higher, because gas-fired generation would fill the gap. Ofgem data shows that solar already supplies about 5% of UK electricity, and the government’s own projections suggest that figure must reach 15% by 2030 to keep bills stable. Remove that, and the market tightens.

Who qualifies, and who doesn’t

The immediate target of Reform UK’s ire is the Smart Export Guarantee (SEG), which pays households 5-15p per kWh for solar power they send back to the grid. For a typical 3-bed semi with a 4kW array, that means £150-£200 a year in income. Scrap it, and that cash disappears overnight. But the bigger hit is on the wholesale side: less solar means more gas burned at peak times, and the cost lands on every bill, not just solar owners.

The Energy Saving Trust estimates that a solar-and-battery setup can cut a household’s annual electricity bill by 60-70%. Without the SEG and with higher wholesale prices, that saving could shrink to 30% or less. A household currently paying £1,200 a year for electricity might see their bill rise to £1,800, a £600 increase, even if they keep their panels.

What it costs a typical 3-bed semi

Take a semi-detached house in Manchester using 3,500 kWh of electricity per year. With a 4kW solar system and no battery, the household currently saves about £400 annually on bills and earns £150 from the SEG, total benefit £550. Under Reform UK’s proposed changes, the SEG disappears and wholesale prices rise 20%, so the electricity rate climbs from 28p/kWh to 34p/kWh. The household’s bill jumps from £980 to £1,190, and the solar saving drops to £280. Net annual loss compared to today: £270.

But the catch is that households without solar lose even more. A neighbour without panels sees their bill rise from £980 to £1,190 directly, a £210 increase. Multiply that by 28 million UK households, and the national cost runs into billions.

Industry analysts at Cornwall Insight have modelled a scenario where the UK abandons its 2030 clean-power target. Their baseline: wholesale electricity prices 15-25% higher than under the current trajectory. For the average dual-fuel household, that adds £180-£300 a year, before any solar-specific tariff changes.

What homeowners should do now

The policy threat is not law, and no change is imminent. But the uncertainty is real. Homeowners considering solar should lock in current SEG rates by installing before any policy shift. The current SEG floor is 5p/kWh, and some suppliers offer up to 15p. That is a guaranteed return for 20 years under existing contracts.

Grants such as the Boiler Upgrade Scheme and the Great British Insulation Scheme remain government-backed until at least 2028. Installing solar now also improves an EPC rating from D to C or B, which adds 5-14% to a home’s value according to Nationwide data.

The solar industry’s warning is not a lobbying stunt, it is a factual projection of what happens when you remove low-cost generation from a tight market. Homeowners who act before the next general election will lock in current tariffs and grants. Those who wait risk paying the price of a political promise.