Smart Export Guarantee Explained
The Smart Export Guarantee (SEG) is the UK government scheme that requires energy suppliers to pay for surplus solar exported to the grid. Rates vary widely — from 1p/kWh at the worst end to 24p+ at the best.
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Smart Export Guarantee (SEG) rates 2026
All rates inclusive of VAT. Subject to Octopus's most recent rate review — check octopus.energy for live rates before signing up.
| Time window | Import | Export |
|---|---|---|
| Octopus Outgoing Fixed | — | 15p |
| Octopus Flux peak window | — | 24p |
| Octopus Outgoing Agile (variable) | — | 25p |
| EDF Export Variable | — | 5.6p |
| E.ON Next Export | — | 16.5p |
| OVO SEG | — | 4.5p |
| Scottish Power Export | — | 12.5p |
Who wins on this tariff
- Anyone with MCS-certified solar PV
- Battery owners who can time exports to peak windows (Flux)
- Solar + battery + EV households consolidating tariffs with one supplier
When to skip it
- Systems without a SMETS2 smart meter (suppliers won't pay export without half-hourly data)
- Self-installs without MCS certification (excluded from SEG)
What it's worth
A 4 kWp solar system in the Midlands generates ~3,400 kWh/year. Without battery, ~2,400 kWh exports to grid; on Octopus Outgoing Fixed at 12p that's £360/year. Switch to Flux peak-window export at 24p and the same household earns ~£500/year. EDF's 5.6p variable rate costs the same household £225/year — a £275 difference for one decision.
FAQs about SEG
Do I need SEG to install solar?
Can I switch SEG tariffs anytime?
What if I don't have a smart meter?
How are SEG payments made?
Want a personalised SEG comparison?
Send us your last 12 months of half-hourly meter data and we'll model every UK tariff against your actual usage. Free as part of any solar, battery, EV charger, or heat pump install.
Where to go next
- Running an array across a commercial roof? commercial solar maintenance.
- If this is for a business roof, commercial solar installation.
- For diagnosis before you spend anything, an underperforming system.
- If you are pricing up a first installation, solar panels for your home.
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