Smart Export Guarantee for business solar

The Smart Export Guarantee (SEG) is the mechanism that pays you for the solar electricity your business generates but does not use on site. For a commercial installation it is rarely the headline number in the business case — self-consumption savings usually dwarf export income — but it is real money, and crucially it is income that follows ownership. Understanding who keeps it, and why, is one of the clearest reasons a business should think hard before signing a power purchase agreement instead of owning the system.

What the Smart Export Guarantee actually is

The SEG replaced the closed Feed-in Tariff. Under it, licensed electricity suppliers with more than 150,000 customers are obliged to offer a tariff that pays generators for each kilowatt-hour exported to the grid. Smaller suppliers may offer one voluntarily. There is no fixed government rate: each supplier sets its own price, so the market spans a wide band and you choose the best tariff available to you.

Two practical conditions matter for a commercial system. First, the installation must usually be certified under the Microgeneration Certification Scheme (MCS) — for solar PV up to 50kW that is the standard route; larger systems use the equivalent certification. Second, you need an export meter capable of half-hourly readings so the supplier can measure what actually leaves your site. A smart meter or a dedicated export meter handles this.

The phrase “smart export guarantee business” search interest tends to come from finance directors checking whether the same scheme that covers households extends to commercial sites. It does — the obligation on suppliers is the same — but the economics look different at commercial scale, because a well-sized commercial array is designed to be consumed on site rather than exported.

Typical SEG rates and what they are worth

SEG tariffs vary considerably. At the time of writing, fixed export rates from the larger suppliers commonly sit somewhere in the region of 4p to 16p per kWh, with the most attractive rates often tied to taking your import supply from the same provider or to flexible, time-of-day tariffs. The rate you are offered is not guaranteed for the life of the system — most are fixed for a set term and then renegotiated — so it should be modelled conservatively in any business case.

The point worth internalising is the order of magnitude. A commercial unit paying, say, 28p per kWh for imported electricity saves that full amount on every unit of solar it consumes itself. Exporting the surplus at a SEG rate is worth a fraction of that. So the design priority is self-consumption: size the array, and where it stacks up add battery storage, so that as much generation as possible offsets expensive import. Export income is the sensible mopping-up of genuine surplus, not the goal. We work through how those numbers interact on the cost page and in the finance calculator.

Who keeps the export income — and why ownership decides it

This is where the SEG stops being a footnote and becomes a strategic question. The SEG pays the owner of the generation. Whoever owns the system registers for the tariff and receives the export payments. That single fact reshapes the comparison between financing a system and signing a power purchase agreement.

If you own the system

If you fund the installation through hire purchase, an equipment loan, or cash, your business owns the asset. You register for the SEG, you keep every penny of export income, and you also keep the capital allowances. Solar PV is special-rate (integral-feature) expenditure, so it qualifies for the Annual Investment Allowance at 100% on up to £1m per year, with a 50% first-year allowance on spend above that. Both reliefs are permanent. Note that solar does not qualify for 100% full expensing — that relief is for main-rate plant only — but the AIA route delivers the same first-year cash effect on the great majority of projects.

So an owned, financed system gives the business three streams of value: the import savings from self-consumption, the SEG income on the surplus, and the tax relief on the capital cost. A finance lease shifts the allowances to the lessor (passed back to you through lower rentals) unless it is a long-funding lease; an operating lease leaves the allowances with the owner and lets you deduct the rentals instead. But under any of these ownership-style routes the export income still belongs to the user-operator of the system.

If you sign a PPA

Under a power purchase agreement a third party funds, owns and operates the system on your roof. You buy the electricity it generates at an agreed unit rate. The trade-off is direct: the funder owns the asset, so the funder claims the capital allowances and registers for the SEG, keeping the export income. You get a lower-capex, lower-hassle route to cheaper-than-grid power, but you forgo the allowances, the export revenue and the residual asset value. For a profitable, tax-paying business that can fund the kit, that is usually a worse deal over the life of the system. We set out the full comparison on asset finance vs PPA.

How SEG fits the wider funding picture

SEG income sits alongside, rather than instead of, the other levers available to a UK business. There is no blanket capital grant for commercial solar, but capital allowances, the SEG, and — for some sectors and regions — targeted grant or low-cost-loan schemes can be stacked. Where a regional or sector programme part-funds the kit, you generally still own the balance and still keep the export income on the part you own. The grants and funding page sets out what is realistically available and how it combines with finance.

A few practical points for the SEG specifically:

• Register promptly after commissioning. You cannot claim export income retrospectively for the period before you are signed up, so factor it into the handover checklist.
• Shop the tariff, and revisit it. Export rates change and are often linked to your import supplier, so the best SEG deal can shift when you re-tender your energy contract.
• Model it conservatively. Treat SEG as the supporting actor. If a proposal leans heavily on optimistic export assumptions to make the payback work, scrutinise the self-consumption figures instead.
• Battery storage changes the split. Storing surplus to use in the evening usually beats exporting it, because avoided import is worth more than the SEG rate. That tilts the design toward more self-consumption and less reliance on export income.

Why this matters for the financing decision

The SEG is a useful illustration of the broader principle behind owning solar through asset finance: the value created by the system — tax relief, export income, the asset itself — flows to whoever owns it. A PPA hands all of that to the funder in exchange for taking the capital cost off your plate. Asset finance lets you spread the capital cost over the system’s life while keeping the allowances and the SEG income with your business, where they belong. For most trading companies with a reasonable tax position, that is the difference that makes ownership the better long-run choice.

If you would like us to model the export income, self-consumption savings and tax relief for a specific system and finance structure, request a quote and we will put indicative figures together for your project.