greenhomesums

Solar Export Tariff Comparator UK

Compare UK Smart Export Guarantee (SEG) tariffs side-by-side. Enter your annual solar export and see exactly what each supplier — Octopus, E.ON, British Gas, EDF, OVO, Good Energy and more — will pay you per year.

#solar #tariffs

Interactive SEG export tariff comparator

Worked example

A typical 4 kWp UK solar array with no battery exports around 2,400 kWh/year. Here's what the leading UK suppliers pay for that:

Best tariff
E.ON Next — Next Export Exclusive (16.5p/kWh)
Best annual earnings
£396/yr
Worst tariff
Rebel Energy — Smart Export (2.5p/kWh)
Worst annual earnings
£60/yr
Annual spread (best − worst)
£336/yr

You'll probably want this next

Don't have solar yet? Start with the payback maths

Our full solar calculator shows what a 4 kWp system would earn you on today's best SEG rate.

Open solar payback calculator →

How to pick between them

  • Best open-market flat rate: Octopus Outgoing Fixed (15p/kWh). No requirement to switch imports.
  • Highest headline rate overall: E.ON Next Export Exclusive (16.5p/kWh) — but only if their import tariff is competitive for you too. Do the bundle maths.
  • Best dynamic option: Octopus Outgoing Agile (~12.8p average). Better for south-facing roofs with strong midday exports, worse for east-west splits.
  • Worst of both worlds: sticking with a 5p-ish SEG from your incumbent when Octopus or E.ON would pay 3× as much. Most UK homes haven't switched since install.

Frequently asked questions

What is the Smart Export Guarantee?
Since January 2020 the SEG has replaced the Feed-in Tariff for new UK solar installs. Every GB electricity supplier with 150,000+ domestic customers must offer a SEG tariff to anyone with an export-capable meter. Rates and terms vary enormously — from about 2.5p/kWh on the lowest products to 15–16.5p/kWh on the best — which is why comparing is worth the five minutes.
Can I switch SEG supplier separately from my import supplier?
Yes for most products. Several high-paying SEGs — Octopus Outgoing Fixed and Agile, Good Energy, OVO — accept any GB export MPAN regardless of who you import from. A few of the highest-headline rates (E.ON Next Export Exclusive, British Gas Export & Earn Flex, EDF Export+, ScottishPower SmartGen+) require you to take the same supplier's import tariff, which sometimes makes the bundle worse overall. We flag which products have that tie.
How do I know my annual export figure?
Three good sources: (1) your SEG meter's annual export reading, (2) your solar inverter's app, which usually shows a generation-minus-self-consumption figure close to what you export, (3) an estimate from system size: a 4 kWp UK array generates ~3,800 kWh/year; with no battery you typically export 55–65% (~2,300 kWh), with a 5 kWh battery ~35–45% (~1,500 kWh).
What's a dynamic SEG tariff?
A product like Octopus Outgoing Agile pays you a different rate every half-hour, tracking day-ahead wholesale electricity prices. In practice you earn more when you export during peak demand (4–7 pm in winter) and less overnight. We show 12.8p/kWh as an indicative UK annual average for 2026 Q1 — your actual earnings depend heavily on your export profile. If most of your export is the classic midday peak of a south-facing roof, you may beat this average.
How often do these rates change?
Less often than you'd think. Octopus has held 15p on Outgoing Fixed through 2024–26; E.ON's rates stepped up in late 2024 and have held since. Quarterly is a reasonable check cadence — we refresh this table when Ofgem publishes a new price cap, which is the usual trigger for supplier repricing.
What about Octopus Flux and other battery-export products?
Those aren't SEG tariffs — they're import/export bundles specifically for battery owners with specific flex capability, often tied to Ofgem's Demand Flexibility Service. We don't model them here. If you have a battery and want to look at Flux-style products, the maths is much more about your tariff-import spread than pure export rate.

How this calculator works

The arithmetic is deliberately simple: your annual export kWh × each supplier's p/kWh, divided by 100 to give £/year. The value is in the curation — we maintain a live-ish list of the 10–12 most-used SEG tariffs in Great Britain and flag the ones that require you to take the same supplier's import tariff (because that changes whether the highest headline rate is actually the best deal). Table refreshes quarterly, on roughly the same cadence as the Ofgem price cap .

Dynamic SEG tariffs — notably Octopus Outgoing Agile — don't have a single fixed rate. We show an indicative 2026 Q1 annual-average figure (12.8p/kWh) and flag the tariff as dynamic. For most south-facing UK roofs, Agile averages slightly higher than the flat 15p during summer and slightly lower in winter; over a year the two typically come out within a few percent of each other. If you want a proper model of Agile export earnings, pair this with our Octopus Agile calculator (which covers import; the export-side extension is on the roadmap).

What v1 doesn't model

  • Bundle effects. A higher export rate with a worse import rate can leave you poorer overall.
  • Battery-export products (Octopus Flux, National Grid DFS payouts) — these are a different product class and need their own calculator.
  • Time-of-year variation in dynamic tariff earnings.
  • Regional variation. Flat SEG rates don't vary by DNO region in practice; dynamic tariffs do, slightly.

When this isn't the right answer

If you don't have solar yet, start with the Solar Panel Savings Calculator — SEG is only a fraction of the return and it's always better to optimise self-consumption first. If you have a battery, consider tariffs like Octopus Flux or bundled dynamic products that price import and export together — pure SEG comparison underrates them. And if you're thinking about whether solar still pays for itself at all, the payback calculator is the better starting point.

Related calculators

Ranked by topic overlap with this tool.

Browse topic: Solar calculators for Ofgem price cap