Cheap green loans for solar and heat pumps are nearly here

The government's Warm Homes Loan Scheme is about to reach the public. It puts £300m of grant money into the hands of lenders, who are meant to use it to offer cheaper loans for solar panels, home batteries and heat pumps. The official rules say the consumer launch phase starts in September 2026. The first installer to talk publicly about it, speaking to The Independent this week, says its lenders now expect products to roll out in October.

So the headline is "cheap green loans are here". The small print is "nearly".

I think this is going to open up a massive part of the market.
— Lloyd Greenfield, chief executive of solar installer Glow Green, to The Independent

How a grant becomes a cheaper loan

This isn't a grant you apply for. The government pays participating lenders a non-repayable grant of up to 20% of each eligible loan, paid in arrears once the installation has been verified. Under the scheme rules, lenders must pass that on by cutting the interest rate. The Independent puts the possible saving at up to five percentage points.

The loan caps are generous for a household budget:

• Solar panels: up to £15,000
• Battery storage: up to £15,000, separately
• Air-to-water heat pump: up to £20,000
• Ground-source heat pump: up to £35,000

There's no income threshold and no minimum energy rating. Owner-occupiers and private landlords can both apply, and the rules say any domestic property in the United Kingdom is eligible. Lenders still run their usual credit and affordability checks, so this is for people who can afford repayments but don't have £10,000 sitting in a savings account. Kit has to be MCS-certified and fitted by an MCS-certified installer, and the loan can sit alongside a Boiler Upgrade Scheme grant for a heat pump.

Why now, and why it matters

The timing is not subtle. Ofgem's price cap rises 4% on 1 October, taking a typical household's annual bill to £1,723, up from £1,663. Ofgem's Neil Kenward blamed "high international gas prices". Solar and batteries are one of the few things a household can do about its own bill, and the main barrier has always been the upfront cost rather than the maths.

Glow Green says it currently offers finance at 8.9% and expects the scheme to let it offer some customers 3.9%, over as long as 10 years. On a £10,000 system, that's the difference between a loan that eats most of your savings and one your lower bills might plausibly cover. Might. The Independent is careful to note that whether savings cover repayments depends on the installation price, the rate, how much your panels generate and how much of that power you use yourself.

What's still missing

Here's Ada's take. The machinery is real, but the shop window is empty. The lender application window closed in July. GOV.UK says the first phase is closed to new lenders and a further window will open later in 2026. As of this week, none of the coverage I read names a lender with a live product, and nobody is quoting an APR you can actually sign up to.

That matters because 3.9% is one installer's expectation, not a promise. Each lender sets its own price. A loan that is five points cheaper than a bad unsecured rate can still be dearer than other borrowing you already have access to, such as adding it to a mortgage.

There's also a scam risk. Wherever "government-backed" and "loan" meet, cold callers follow. The scheme runs through FCA-authorised lenders and MCS-certified installers, and there's nothing to apply for directly with the government.

To be fair to the government

This is a sensible design. Rather than handing out grants that run out in a fortnight, it uses a relatively small pot of public money to lower the cost of a lot more private lending. It doesn't means-test, doesn't demand a perfect EPC and covers landlords, who have historically had little reason to fit anything. Greenfield argues it could move solar from an "early adoption phase" towards something closer to the mainstream, and cheaper finance is exactly the lever that would do that.

For now, the practical advice is simple: get MCS-certified quotes, check the lender is FCA-authorised, and compare any Warm Homes rate against your other borrowing before you sign.

Mind the hype. Cheap green loans are coming. Just check the rate before you check the roof.

Sources: The Independent (via inkl), GOV.UK: Warm Homes Loan Scheme rules, GOV.UK: lender application (Phase 1), Lancashire Business View, Ofgem