Prioritises simplicity
Prefer the structure needing less repeated intervention.
Both are simple all-day structures without within-day scheduling.
Tariff comparison
Octopus Fixed vs Flexible
Choose price certainty for a term or retain exposure to future variable-rate changes.
Edited by Rob Gibbs. Guidance reviewed: .
Overall verdict
Choose price certainty for a term or retain exposure to future variable-rate changes. There is no universal winner: use the measured evidence window, then test the result against your own consumption, equipment and current eligibility.
Historic profile evidence
Region: London. Profile: Typical household. Evidence window: 2026-08-01 to 2026-08-31.
Historic profile-weighted evidence, not a bill, forecast or switching quote. Standing charges remain separate.
Comparable evidence is incomplete, so this page does not name a lower-rate choice.
Which household does each structure fit?
Can shift or automate
Give more weight to the option that rewards controllable timing.
Fixed reduces unit-rate movement during the term; Flexible can rise or fall with future price periods.
Has specialist equipment
Check the equipment-led option only after exact compatibility is confirmed.
Neither structure depends on specialist home equipment.
Full feature comparison
| Feature | What differs |
|---|---|
| Equipment | Neither structure depends on specialist home equipment. |
| Eligibility | Compare the exact live quote, term, payment method and any exit fee; the family page is not a contract offer. |
| Effort and automation | Both are simple all-day structures without within-day scheduling. |
| Price variability | Fixed reduces unit-rate movement during the term; Flexible can rise or fall with future price periods. |
| Import/export pairing | Import choice and any export contract should be checked separately. |
Equipment
Neither structure depends on specialist home equipment.
Eligibility
Compare the exact live quote, term, payment method and any exit fee; the family page is not a contract offer.
Household effort
Both are simple all-day structures without within-day scheduling.
Price risk
Fixed reduces unit-rate movement during the term; Flexible can rise or fall with future price periods.
Import and export pairing
Import choice and any export contract should be checked separately.
Standing-charge treatment
The historic evidence displays standing charges separately. A lower profile-weighted unit rate is not a lower annual bill unless daily charges and annual kWh are also included.
Seasonality
One complete month can differ from a trailing year. Heating, solar generation, EV mileage and wholesale conditions can all move with the season, so the evidence is not a forecast.
Break-even limits
A meaningful break-even needs comparable unit rates, standing charges and one explicit annual-use profile over the same evidence window. Half-hourly or daily rates and household timing vary; one static unit-rate crossing would imply precision the evidence does not have.
When the answer could change
- Your annual kWh or half-hourly usage shape changes.
- Current product versions, prices or standing charges change.
- Equipment compatibility or supplier eligibility changes.
- A different season changes heating, driving, generation or export.
Questions people ask
Does Octopus Fixed vs Flexible have one winner?
No. The page separates measured historic evidence from household-specific constraints and does not predict future prices.
Does the ranking include a full bill?
No. The unit-rate evidence and standing charge are shown separately; other bill adjustments and future rates are excluded.
Can the result change after I switch?
Yes. Rates, seasons, usage, product terms, device support and meter performance can all change.
Primary sources
- Domestic energy supply terms and conditions — Octopus Energy; checked 2026-08-24. General domestic tariff, meter, pricing, switching and referral terms.
- Energy price cap and standing charges explained — Ofgem; checked 2026-08-24. What the cap covers, how it is calculated, and why it is not a household bill limit.