Intelligent Octopus Go 12M Fixed June 2026 v1 vs EDF Exclusive Sep28v2

Side-by-side comparison of Octopus Intelligent Octopus Go 12M Fixed June 2026 v1 and EDF EDF Exclusive Sep28v2 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
Intelligent Octopus Go 12M Fixed June 2026 v1
 EDF
EDF Exclusive Sep28v2
Total cost (90 days) £169.71 £169.71
Daily average £1.89 £1.89
Annualised £688/yr £688/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

Intelligent Octopus Go 12M Fixed June 2026 v1

Time of Use Fixed
Full details & per-region rates
EDF
EDF

EDF Exclusive Sep28v2

Standard Fixed
Full details & per-region rates

Questions

Over the modelled 90-day period, Intelligent Octopus Go 12M Fixed June 2026 v1 and EDF Exclusive Sep28v2 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.

Intelligent Octopus Go 12M Fixed June 2026 v1 is a time of use tariff from Octopus. EDF Exclusive Sep28v2 is a standard tariff from EDF. 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.

Both Octopus and EDF publish per-region rates 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