British Gas SEG Hidden Clauses
British Gas SEG Hidden Clauses: The Small Print Nobody Mentions in 2026
I’ve read every line of British Gas’s export tariff terms — twice — so you don’t have to. Here are the 7 clauses that quietly decide what your solar actually earns, and what to do about each one.
☀️The 60-second version
The Smart Export Guarantee (SEG) is the government scheme that pays you for surplus solar sent to the grid, and British Gas is one of its biggest licensees. On paper, its export deal looks tidy. In the terms and conditions, it’s a different story.
✔️ Headline rate: 12p/kWh on Export Premium — but only if you also buy your electricity from British Gas.
✔️ Not a BG customer? You’re parked on the basic Export SEG tariff at 3p/kWh — a quarter of the headline.
✔️ The rate isn’t fixed. It’s a variable tariff, and on 6 July 2026 the top rate was cut from 15.1p to 12p (our live best SEG tariff rates tracker had it at 15.1p before that cut).
✔️ Payments land quarterly, within 28 working days of a meter reading — so your first payment can be months away.
✔️ On a Feed-in Tariff? Moving to SEG is a one-way door you can only walk through once every 12 months.
None of this is illegal or sneaky-in-the-dark — it’s all in the open, buried in clause-speak. That’s exactly why I’ve pulled the seven most expensive lines out and translated them below. (For the official rules of the scheme itself, Ofgem’s SEG overview is worth a bookmark.)
🏷️British Gas’s four export tariffs, side by side
Before the clauses make sense, you need the line-up. British Gas now runs four export tariffs, and which one you land on depends on two things: who supplies your electricity and how big your system is.
| Tariff | Rate (p/kWh) | Who gets it | The catch in one line |
|---|---|---|---|
| Export Premium | 12p | BG electricity customers, systems up to 15kW | Variable rate; tie-in required |
| Export Extra | 8p | BG customers, systems over 15kW | The 15kW cliff (clause 3) |
| Export Voidcare | 6p | Social landlords / VoidCare customers, up to 15kW | Applied automatically |
| Export SEG | 3p | Everyone else — including non-BG customers, developers, and VoidCare customers over 15kW | The legal minimum-effort rate |
📄The 7 hidden clauses, translated
The two-tier rate Costs the most
The “up to 12p” headline is exclusive to British Gas electricity customers. Apply without a BG import account and you’re placed on Export SEG at 3p/kWh — four times less for the exact same electrons. The headline rate is a loyalty price, not a market price.
“Variable tariff – the price can go up or down” Rate risk
That’s a direct quote from the tariff features. There’s no fixed term and no rate guarantee — just around a month’s notice before a change. The 6 July 2026 cut (15.1p → 12p, and → 8p above 15kW) proves they’ll use it. If you budgeted your payback at 15.1p, your maths just changed without your permission. This is also why our SEG rate comparison carries a “confirm the live rate” warning on every row.
The 15kW cliff Bigger systems
Cross 15kW of installed capacity and your rate falls off a cliff from 12p to 8p — a 33% pay cut on every exported unit. Fine if you’re a farmhouse or small business that chose Export Extra knowingly; nasty if you assumed “bigger system = bigger earnings”.
The smart meter mandate Admin
You must have a smart meter sending half-hourly export readings, and be based in England, Scotland or Wales (Northern Ireland is out). If your meter stops sending, BG will ask you to submit manual readings every three months — miss one and your payment stalls. We’ve written a whole fix-it guide for when your smart meter isn’t sending export readings, because it’s one of the most common SEG payment killers.
The paperwork gate & rent-a-roof ban Eligibility
You’ll need an MCS or Flexi-Orb certificate plus G98/G99 grid-connection proof from your DNO — and here’s the line nobody expects: systems under a rent-a-roof agreement don’t qualify for Export Premium, and the property must actually be occupied. If you’re untangling one of those old “free solar” leases, read our piece on the free solar panels that could stop you selling your house first. (Not sure what MCS even means? This badge explainer helps.)
The FIT one-way door Legacy owners
You can’t claim Feed-in Tariff export and SEG at once — fair enough. But you may only opt out of FIT export once every 12 months, and once you switch from deemed to metered export, you can’t go back. If your FIT export payment still beats 12p/kWh (for many older systems, it does), jumping to BG’s SEG can be a permanent downgrade.
Quarterly payments, 28-day lag, no backdating Cash flow
Payments arrive every three months, within 28 working days of receiving a reading. And exports made before your registration completes are not paid, so the 2–4 weeks of admin time is solar income you simply never see. Compare that with suppliers paying monthly.
💷What the small print actually costs you
Let’s make it real with the same benchmark we use across SolarBriton: a typical 4kW system exporting ~2,000 kWh a year.
| Scenario | Rate | Annual income | vs Export Premium |
|---|---|---|---|
| BG Export SEG (not a BG import customer) | 3p | £60 | −£180/yr |
| BG Export Premium (tied, ≤15kW) | 12p | £240 | — |
| BG Export Extra (tied, >15kW) | 8p | £160 | −£80/yr |
| BG top rate pre-6 July 2026 | 15.1p | £302 | +£62/yr |
| Best tied rate on market (EDF) | 24p | £480 | +£240/yr |
Read the table sideways and the clauses turn into cash: the tie-in clause is worth £180 a year, the July rate cut is worth £62 a year to British Gas, and the gap to the market’s best tied rate is £240 a year. Over a 10-year system life, small print is a four-figure decision. (Worried about the bigger picture? Our payback period guide shows how export rates feed into the whole calculation.)
📊How British Gas stacks up against the 2026 market
Export rates, p/kWh (August 2026)
Rates mirror our live SEG rate tracker (checked August 2026). Good Energy’s headline 25p specifically requires installing both solar panels and a battery through Good Energy Solar — it isn’t an open-access rate. Suppliers can change rates with ~30 days’ notice — always confirm before applying.
Two honest points in British Gas’s favour. First, Export Premium doesn’t demand an installer tie-in — unlike Good Energy’s 25p or EDF’s 24p exclusives, you don’t need to have bought your panels from them, only your electricity. Second, it’s free to switch or cancel at any time, no exit fees. So if you already buy your electricity from British Gas and your system is under 15kW, 12p variable is a perfectly respectable place to sit — as long as you accept clause #2 and check the rate once in a while.
✅Stay or switch? My honest verdict
Remember the golden rule of the SEG: your export supplier does not have to be your import supplier. You can keep whoever supplies your electricity and take your exports anywhere — the gov.uk SEG guidance confirms it. British Gas’s whole two-tier structure relies on people not knowing that.
🔀How to switch your SEG supplier in 4 steps
Check what you’re on today
Find your current export rate and confirm your meter sends half-hourly export readings. If it doesn’t, fix that first — our smart meter export fix guide walks through it.
Compare the full market
Use our tariff-by-tariff SEG comparison and note which rates are tied to imports, installs or batteries. With import electricity capped near 26p/kWh under the current price cap, every exported unit matters — see our price cap explainer.
Gather your paperwork
MCS certificate, G98/G99 DNO confirmation, and your export MPAN. No MCS cert? Read what the MCS badge actually means before paying anyone to “re-certify” you.
Apply, then time the hop
Applications take 2–4 weeks and exports aren’t backdated, so apply to the new supplier before cancelling the old one where possible. If you have a battery, also read Flux vs Cosy Octopus and our best solar battery guide first.
🧾 The 2-minute pre-sign checklist
❓Quick questions, straight answers
Do I have to be a British Gas electricity customer to get its best SEG rate?
Yes. Export Premium (12p/kWh, systems up to 15kW) and Export Extra (8p/kWh, over 15kW) are exclusive to British Gas electricity import customers. Everyone else lands on the basic Export SEG tariff at 3p/kWh — which is the single most expensive line of small print in the whole document.
Can British Gas change my SEG export rate after I sign up?
Yes — the tariffs are explicitly variable, with roughly a month’s notice for changes. The 6 July 2026 cut from 15.1p to 12p (and to 8p for systems over 15kW) shows the clause gets used. If you want certainty, look at fixed-rate rivals in our best SEG rates guide.
Can I claim Feed-in Tariff and British Gas SEG payments at the same time?
No. You can’t receive both for the same installation, you may opt out of FIT export only once every 12 months, and moving from deemed to metered export is permanent. Many legacy FIT export rates still beat 12p/kWh, so do the sums before you switch — our tariff history explainer puts it in context.
📚Keep reading
Rates and terms checked August 2026 against British Gas’s published SEG tariff page, Ofgem’s scheme rules, and independent supplier-rate trackers. This article is guidance, not financial advice — always confirm live rates and terms with the supplier before applying.
