Octopus 18M Fixed October 2026 v3 vs Co-op Community Power 18M Fixed October 2026 v3

Side-by-side comparison of Octopus Octopus 18M Fixed October 2026 v3 and Octopus Co-op Community Power 18M Fixed October 2026 v3 using real UK smart-meter data. Modelled over 90 days ( — ).

It’s a near tie

Over 90 days, both tariffs cost within a pound of each other. See the breakdown below.

Cost breakdown

  Octopus
Octopus 18M Fixed October 2026 v3
 Octopus
Co-op Community Power 18M Fixed October 2026 v3
Total cost (90 days) £163.62 £163.62
Daily average £1.82 £1.82
Annualised £664/yr £664/yr
Calculated . Levy adjustment applied to dynamic-tariff slots pre-1 April 2026.

Monthly cost

Each bar is the modelled cost for that calendar month using the modelled household’s actual half-hourly consumption pattern.

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The figures above use a modelled household. Your own saving depends on when you use electricity — run this comparison against your real half-hourly smart-meter readings to see numbers that match your usage.

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About these tariffs

Octopus
Octopus

Octopus 18M Fixed October 2026 v3

Standard Fixed
Full details & per-region rates
Octopus
Octopus

Co-op Community Power 18M Fixed October 2026 v3

Standard Fixed
Full details & per-region rates

Questions

Over the modelled 90-day period, Octopus 18M Fixed October 2026 v3 and Co-op Community Power 18M Fixed October 2026 v3 came out within a pound of each other. For households on the edge between two tariffs, the right choice usually comes down to load shape and your appetite for variable pricing.

Octopus 18M Fixed October 2026 v3 is a standard tariff and Co-op Community Power 18M Fixed October 2026 v3 is a standard tariff, both from Octopus. They differ in how the unit rate is structured across the day, which is what drives the cost difference for households with shiftable load.

We take a real UK home's half-hourly smart meter data over the previous 90 days and model the bill on each tariff using the supplier's current published rates and standing charges. Standing charges scale with the modelled period; unit rates apply per half-hour using each tariff's rate structure (standard, Economy 7, time-of-use bands, or wholesale-tracking). Full methodology and data sources are linked below.

Octopus publishes per-region rates for both these tariffs across the 14 UK DNO areas. Click through to either tariff page below to see the rates and standing charge specific to your DNO. Some tariffs require a smart meter or have other eligibility criteria set by the supplier.

The cost calculation rebuilds every night using current rates. Page caching is one hour so repeat visits within the day are fast. If a tariff's rates change mid-day, you will see the new numbers on the next nightly refresh.

How this comparison is built. Every cost figure on this page comes from modelling real half-hourly UK smart-meter data against each supplier’s current published rates and standing charges. The calculation refreshes nightly. We earn a small commission when a switch completes via a referral link — it does not affect the price you pay.

Read the full methodology Where the data comes from