Thinktank: Solar Bonds Would Halve UK Panel Loan Rates
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- Common Wealth thinktank proposes "solar bonds" — retail investment products modeled on premium bonds and national savings investments — to fund government-backed rooftop solar loans at roughly half the current 9-10% market interest rate.
- The proposed 25-year loans would attach to the property rather than the borrower and be repaid via an addition to the standing charge on households' energy bills, so the debt transfers to the next occupier if the home is sold.
- Donal Brown, lead author and senior researcher at the Environmental Change Institute at Oxford University, estimated the scheme could cut household energy bills by about £250 a year, with investors in solar bonds earning around 4-5% interest.
- Solar Energy UK policy director Gemma Grimes welcomed the proposal as a further means of accelerating the "rooftop revolution" alongside the government's warm homes plan.
- Energy secretary Miatta Fahnbulleh said the government is already rolling out zero and low-interest loans for solar panels, batteries and heat pumps that could save families around £550 a year, and cited 150,000 UK solar installations in the first six months of 2026 — roughly one every 74 seconds.
- The UK energy price cap is forecast to rise 4% from October to £1,729 a year for the remainder of 2026, sharpening the cost-of-living case for cheaper solar financing.
Why it matters: For UK households priced out of the £5,000-£10,000 upfront cost of rooftop solar, current commercial loans charge 9-10% interest that erodes most bill savings for a decade. A state-backed product at roughly half that rate — attached to the property rather than the borrower — would convert solar into a universal entitlement, though ministers have yet to sign on.
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