Export income

The highest SEG export rate on the UK market right now, Octopus Intelligent Flux at up to 32.17p per kWh, is only available if you have a battery and an Octopus import tariff, which tells you where export income is actually heading

July 2026's best flat SEG rate without a battery requirement is 25p per kWh from Good Energy, but the genuine ceiling, Octopus Intelligent Flux's 32.17p peak, is locked behind owning a battery, which is no longer an edge case in how export tariffs are being designed.

31 July 2026 · Source: EnergyPlus

The gap between 25p and 32.17p is not a small optimisation, it's roughly 7p per kWh, and the fact that the higher figure requires a battery rather than being open to any solar-only export is the more important detail than either number alone. Export tariff design is increasingly structured around time-of-use and battery-enabled flexibility rather than a flat rate for whatever a panel happens to push out during daylight, and Intelligent Flux's peak rate specifically rewards exporting at times the grid values it most, which a battery makes possible and solar alone does not.

This is the same pattern we flagged when the July price cap rise made self-consumption more valuable: batteries don't just add a cost saving on the import side, they're now the gatekeeper to the best export rates too. A solar-only system in July 2026 is locked out of the top tier of SEG income entirely, not just earning a slightly lower rate on it, which changes the payback maths on adding a battery from 'nice to have' to 'unlocks a different tariff tier you can't otherwise reach.'

The tariff-linkage requirement, needing an Octopus import tariff to access the Octopus export rate, is worth flagging on its own. These top-tier export rates are increasingly supplier-exclusive rather than available regardless of who you buy your electricity from, which means choosing a battery-plus-export strategy now also means choosing a supplier relationship, not just a piece of hardware. That's a meaningfully different decision than it was when SEG rates were closer to flat and supplier-agnostic.

For a household deciding whether a battery pencils out, the honest framing is that the answer increasingly depends on export ambition as much as self-consumption. If the goal is simply to use more of your own generation, self-consumption savings alone can justify a battery regardless of SEG rates. If the goal includes maximising export income specifically, the market has moved to a point where solar without a battery is leaving the best available rates on the table by design, not by oversight.

Read the original: EnergyPlus. Commentary is Sandwich Solar's own editorial view; the original reporting is credited to its publisher.

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