One in three households with solar panels could earn more from exporting electricity than they spend buying it, The Independent reported this week. The same day, the paper also reported that millions of UK households are in energy debt, with three practical steps offered to those struggling to pay.
Read together, the two stories describe a market that has split in two. On one side are homes with roof space, capital and a smart meter, where solar and export tariffs are turning the electricity bill into a small income stream. On the other are homes borrowing to cover the standing charge. The gap between them is not really about sunshine. It is about who can afford to invest before the next bill lands.
What the solar payback figure actually assumes
The Independent’s one-in-three claim rests on a specific set of conditions: a well-sized array, a smart export guarantee tariff paying a reasonable rate per kWh, and enough daytime self-consumption to avoid buying back power at the import price. A typical 3-bed semi in the Midlands with a 4 kWp array generates roughly 3,500–4,000 kWh a year. If the household uses about half of that during the day and exports the rest at 15p per kWh, export income lands near £260–£300 a year. The import bill for the same home, on a standard variable tariff, is closer to £1,700–£1,900.
That arithmetic does not put most solar homes in credit. The one-in-three figure depends on unusually high export rates, low household consumption, or a battery that shifts generation into the evening peak. The Independent’s framing is optimistic but not wrong: for a retired couple in a well-insulated bungalow with a 5 kWp array and a 10 kWh battery, export income can genuinely exceed import costs in a good year.
The catch is that the same household had to spend £9,000–£14,000 up front to get there. Without the battery, the payback stretches to 12–14 years. With it, closer to eight. Neither number appears in the headline.
Energy debt is now a mainstream problem
The second Independent story is the mirror image. Millions of households are now in arrears with their supplier, and the paper’s three suggested steps, contact the supplier, ask for an affordable payment plan, and seek help from a charity or council-run scheme, are sound but modest. They treat the symptom, not the cause.
The cause is that the standing charge alone now runs to £180–£220 a year before a single kWh is used, and homes in the worst-insulated third of the housing stock burn through heating at two to three times the rate of an EPC C home. A 3-bed semi with solid walls and a G-rated boiler can spend £2,800 a year on gas and electricity. The same house with cavity wall insulation, 270 mm of loft insulation and a modern condensing boiler spends closer to £1,900.
That £900 gap is the real story. It is also the gap that grant funding is designed to close, and the gap that debt makes almost impossible to cross, because the households most in need of insulation are the least able to fund it up front or take on the assessment process while juggling arrears.
The grants that change the arithmetic
Three schemes matter for readers trying to work out which side of the divide they are on.
The Boiler Upgrade Scheme offers £7,500 towards an air-source heat pump in England and Wales. For a well-insulated 3-bed semi replacing a gas boiler, that covers roughly half to two-thirds of a typical £10,000–£13,000 installation, depending on radiator upgrades and whether the home needs a hot water cylinder moved.
ECO4 funds insulation and heating upgrades for households on means-tested benefits or with a low income and a poor EPC. It is the route most relevant to anyone in the debt story, because it does not require capital up front, the work is delivered by an obligated supplier.
The Great British Insulation Scheme, HUG2 in England, targets the least efficient homes. Eligibility varies by council, and the application process is slower than ECO4, but for a solid-wall Victorian terrace the grants can run to £8,000–£10,000 for internal or external wall insulation.
None of these schemes pays for solar. That is the honest limitation. The one-in-three solar household is almost always a household that could already afford the array.
What a typical 3-bed semi should do next
Start with the EPC. If it is below band C, the priority is insulation and heating, not solar, and the grants above will do more for the bill than 4 kWp of panels ever could. A home at band D or below with a gas boiler should look at ECO4 first, then the Boiler Upgrade Scheme if a heat pump is on the table.
If the EPC is already C or above, and the roof faces within 90 degrees of south, solar becomes worth pricing. Get three quotes, ask each installer to model self-consumption at your actual daytime usage, and check the export tariff on offer before signing. A 4 kWp array with a battery will cost £9,000–£12,000; without one, £5,500–£7,500. The Independent’s one-in-three figure is achievable, but only for households that can wait eight to ten years for the money back.
For anyone already in arrears, the order is different. Contact the supplier before the next bill, ask for a payment plan under Ofgem’s rules, and ask the council’s energy advice service whether ECO4 or HUG2 applies. Debt blocks grants less often than people assume, the eligibility tests are about income and EPC, not credit history.
The two stories are not really separate. They are the same story about who can afford to fix their home, and who cannot. The grants exist to narrow that gap. The application window for ECO4 runs until March 2026, and the Boiler Upgrade Scheme is open now through gov.uk. Households that act this winter will be on the right side of the line by next spring.
Frequently Asked Questions
For some homes, yes, typically those with a 4–5 kWp array, a battery and a decent export tariff, using little power in the evening peak. For most 3-bed semis, export income offsets part of the bill rather than exceeding it. The Independent's one-in-three figure assumes favourable conditions that many installations do not meet.
Yes. ECO4 eligibility is based on income, benefits and EPC rating, not credit history. The Boiler Upgrade Scheme is open to any homeowner in England and Wales replacing a fossil-fuel heating system. Being in arrears with a supplier does not disqualify you, though it is worth telling the installer so the payment structure can be arranged sensibly.
Insulation first. Cavity wall and loft insulation together typically save £300–£500 a year and are covered by ECO4 for eligible households. A modern condensing boiler or heat pump adds another £200–£400. Solar comes after the EPC reaches band C, because a leaky home wastes much of what the panels generate.
