Zero-CapEx Solar: How UK Businesses Get Renewable Energy Infrastructure Without Paying for It
4 Minute Read
By
Jake Loggie
How zero-CapEx solar funding works for UK businesses: who pays the capital cost, how the PPA structure protects the client, and what happens at the end of the contract.
How Zero-CapEx Funding Actually Works
The single biggest barrier stopping UK businesses from installing commercial solar has never really been whether it works. It's cost. A rooftop solar system large enough to make a meaningful dent in a commercial energy bill can run into hundreds of thousands of pounds in capital cost before a single panel generates a unit of power.
Zero-CapEx funding removes that barrier entirely. The business pays nothing upfront, and in many cases nothing at all toward the capital cost over the life of the system.
How the Model Actually Works
There are three parties involved in a typical zero-CapEx solar deal:
The investor. Institutional investors and funds provide 100% of the capital expenditure, covering equipment, engineering, installation, and ongoing maintenance for the life of the system.
The client. The business hosts the system on its rooftop or land, behind the meter, and agrees to buy the electricity it generates at a pre-agreed rate, typically lower than the standard grid tariff.
The energy infrastructure partner. This is where Ardora Energy sits, structuring the deal, managing the relationship between investor and client, and overseeing the project from feasibility through to installation and ongoing operation.
Behind the Meter: How the PPA Makes It Work Financially
What "Behind the Meter" Actually Means
Solar or CHP installed under this model is connected directly to the client's site, not exported to the national grid. This is what's known as a private wire or "behind-the-meter" installation. The electricity generated is used immediately on-site, which is why the client can buy it at a lower rate than grid electricity: there's no transmission cost, no network charge, and no supplier margin sitting between generation and use.
The Power Purchase Agreement (PPA)
The PPA is the contract that makes the zero-CapEx model work financially for both sides. The client agrees, typically over 10 to 25 years, to buy the electricity the system generates at a fixed or pre-agreed rate. That rate is set below the client's standard grid tariff from day one, meaning savings start immediately rather than after a payback period.
The investor recovers their capital cost over the life of the contract through those payments, plus a return, which is why the model only works with a long-term commitment from the client. Shorter contracts don't give the investor enough time to recover the investment, which is part of why zero-CapEx deals are structured over a decade or more rather than a few years.
Who Carries the Risk?
In a properly structured zero-CapEx deal, the investor and the energy infrastructure partner carry the technical and financial risk, not the client. If the system underperforms, requires unexpected maintenance, or needs repair, that cost sits with the investor and the team managing the asset, not with the business hosting it.
What Happens at the End of the Contract?
What Happens at the End of the Contract?
This varies by deal structure, but commonly one of a few things happens: the client can extend the agreement, the asset can be bought out by the client at an agreed value, or ownership can transfer to the client once the investor has recovered their capital and return. This should always be agreed and written into the contract from the outset, not left ambiguous.
Why This Model Has Become the Standard Route Into Solar
For most commercial property owners, the choice was historically binary: pay six or seven figures upfront for solar, or don't install it at all. Zero-CapEx removes that choice entirely. The business gets a lower energy cost, a smaller carbon footprint, and improved compliance against net-zero and ESG targets, all without touching its own capital or balance sheet.
Is Your Site a Fit for Zero-CapEx Funding?
The model works best for businesses with significant roof space or land, high enough energy spend to make the investment worthwhile for funders, and the ability to commit to a long-term agreement. Ardora Energy can assess feasibility on your site using your actual usage and roof data, with no cost or obligation.
Get in touch to find out if your site qualifies.
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Author:
Jake Loggie
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