Octopus Cosy Tariff 2026
Octopus Cosy is purpose-built for heat pump homes. Six hours of cheap rate per day in two windows — 04:00–07:00 and 13:00–16:00 — when air-source heat pumps run at their highest COP. Average heat pump household saves £400–£700/year vs standard variable.
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Octopus Cosy 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 |
|---|---|---|
| 04:00 – 07:00 (cheap) | 10p | 15p |
| 07:00 – 13:00 (standard) | 28p | 15p |
| 13:00 – 16:00 (cheap) | 10p | 15p |
| 16:00 – 19:00 (peak) | 36p | 15p |
| 19:00 – 04:00 (standard) | 28p | 15p |
Who wins on this tariff
- Air source heat pump owners
- Underfloor heating with thermal mass (afternoon cheap window pre-heats the slab)
- Hot water cylinder timer aligned with cheap windows
- Solar + heat pump combo (afternoon cheap window often coincides with solar peak)
When to skip it
- EV owners (Go or Intelligent are cheaper for overnight charging)
- Battery + solar without heat pump (Flux usually wins)
What it's worth
A 9 kW air source heat pump scheduled to run during the two Cosy cheap windows costs around £810/year to operate, vs £1,470 on standard variable — a £660/year saving on heating alone. Add solar offsetting the daytime windows and total savings can exceed £900/year.
FAQs about Octopus Cosy
Cosy vs Go for heat pumps?
Can I switch to Cosy without a heat pump?
Do I need a special heat pump controller?
Other tariffs
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