Solar Bonds UK: Interest-Free Solar Panels Explained

A report published on 24 August 2026 by the Common Wealth thinktank has proposed a universal "Solar Bond" scheme for the UK — government-backed finance that would let any household with a suitable roof install solar panels and a battery without a credit check, repaying the cost through their energy bill over 25 years. It's a proposal, not a live scheme: nothing has been legislated or funded yet. But it lands at a moment when solar panel financing UK-wide is under real scrutiny, alongside a separate think-tank call for 2% government-backed loans and finance products already on the market from mainstream energy suppliers. Here's what's actually being proposed, what already exists today, and what it would mean for your bills if either idea goes ahead.

What the Solar Bond proposal actually says

The report, "A Right to the Sun: How a New Solar Bond Can Cut Bills and Build Energy Security," was written by Dr Donal Brown, a senior researcher at Oxford's Environmental Change Institute, and published by the Common Wealth thinktank. It proposes a universal entitlement: any household with a suitable roof could get solar panels and a battery installed with no upfront cost and no credit check, because eligibility would be tied to the property rather than the individual's credit history.

The typical cost of a domestic installation — the report cites a range of £5,000 to £10,000, in line with figures on our own solar panel cost guide — would be repaid over 25 years through charges added to the household's energy bill, similar in structure to how the retired Feed-in Tariff or a mortgage-style property charge works. Because the debt sits with the property, not the person, Dr Brown notes that if you move house, the repayment obligation (and the panels) transfers to the next occupant, rather than following you or being wiped clean.

The capital to fund it would come from retail "Solar Bonds" — investment products sold to the public, similar in concept to National Savings & Investments products, where savers earn a modest guaranteed return in exchange for their money funding other households' installations. The report estimates participating households could save at least £250 a year on energy bills once installed.

A second, separate proposal: 2% loans via the Bank of England

The Solar Bond isn't the only financing idea in circulation. A separate report published on 7 July 2026 by the New Economics Foundation and the Finance Innovation Lab argued for a different mechanism: preferential, low-interest lending facilities operated through the Bank of England that would let commercial lenders offer solar and battery loans at around 2% interest. That report estimated a scheme along these lines could bring solar and battery installs within reach of more than 8 million households, saving around £251 a year on electricity bills over a 15-year period.

The two proposals aren't the same policy — one is a property-attached bond funded by retail investors, the other is central-bank-backed cheap lending funnelled through commercial banks — but they share a diagnosis: solar's limiting factor in the UK isn't roof space or panel supply, it's the cost and availability of upfront finance. Neither has been adopted by the government at the time of writing.

What financing already exists today, without waiting for a Solar Bond

You don't have to wait for either proposal to reduce the upfront cost of solar. A handful of routes are already live:

• 0% VAT relief on the installation of solar panels and battery storage in residential properties runs until 31 March 2027 across Great Britain, after which the rate reverts to 5%.
• The Warm Homes Plan includes a mix of grants and low-interest loan routes for eligible households — see our Warm Homes Plan guide for who qualifies and what each route covers.
• Commercial spread-cost finance is also expanding: Good Energy's Zopa-backed scheme, for example, lets homeowners install with a 25% deposit and repay the rest over five to ten years at 9.9% APR representative — see our breakdown of Good Energy's solar finance deal for a worked example of what that costs versus paying cash.
• Devolved and local grants can also reduce the amount you need to finance in the first place — see our guides to solar panel grants in the UK and the free solar panel schemes for low-income households.

The gap a genuine Solar Bond or 2% loan scheme would fill is the one that's hardest to close today: a route with no credit check and no deposit, for households who don't have £5,000–£10,000 in savings and wouldn't clear the affordability checks that commercial lenders apply at 9–10% APR.

What to watch for next

Neither proposal has government backing yet. The Common Wealth report is a policy pitch aimed at influencing the Warm Homes Plan and forthcoming energy affordability policy, not an announced scheme — there's no application process, no eligibility checker, and no confirmed launch date. If a version of it is adopted, the practical details that will matter most are the actual interest-equivalent cost baked into the 25-year bill repayment, whether it's opt-in or automatically offered when you move into a home with an existing Solar Bond attached, and how it interacts with home sales and mortgage lending (property-attached charges can affect mortgageability, which is exactly the kind of detail that sinks or saves proposals like this at the legislative stage).

We'll update this page if either proposal is taken up in government policy. In the meantime, if the appeal is "no upfront cost," the closest things that exist today are 0% installer finance offers and the Warm Homes Plan's grant routes — both worth checking before assuming you need £5,000+ in cash to get started.