Comparison · 2 picks
Intelligent Octopus Go vs Flux UK 2026
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For UK Octopus customers with EVs in 2026, two tariffs offer smart-charging integration: Intelligent Octopus Go (single-direction smart-charging, the mass-market choice) and Intelligent Octopus Flux (bidirectional V2G with export income, for households with the supporting hardware). This comparison covers the practical differences and the decision criteria.
At a glance
All 2 options side by side.
 |  Intelligent Octopus Flux | |
|---|---|---|
| Best for | typical UK EV households without solar PV interest, V2G-capable EVs, or bidirectional chargers. | early adopters with the hardware in place + willingness to participate in active grid export. |
| Review | Read review → | Read review → |
| Buy |
The picks in detail
Octopus Energy Intelligent Octopus Go
Bottom line. The default UK EV tariff for households with single-direction smart-charging needs. Best for: typical UK EV households without solar PV interest, V2G-capable EVs, or bidirectional chargers.
Pros
- Off-peak rate 6.99p/kWh as of July 2026 - among the cheapest in the UK
- Cheap rate applies to your whole home during the 6-hour window, not just the EV
- Works with Ohme, Andersen, Wallbox, Hypervolt, Zappi and Octopus Charge
- Intelligent scheduling can add bonus cheap slots during the day when grid supply is high
- No exit fees on the variable Intelligent Octopus Go product
Cons
- From March 2026 only the first 6 hours of nightly charging are at the off-peak rate; further charging falls back to the higher Boost rate
- Requires an SMETS2 (or compatible SMETS1) smart meter and a smart EV charger that supports Octopus's intelligent scheduling
- Daytime/peak rate of around 32p/kWh is unremarkable - the savings rely on shifting most usage to overnight
- Customers report occasional billing-accuracy issues on overnight sessions that need manual support to resolve
Octopus Energy Intelligent Octopus Flux
Bottom line. The V2G-tier Octopus tariff for households with bidirectional charger + V2G-capable EV setup. Best for: early adopters with the hardware in place + willingness to participate in active grid export.
Pros
- Bidirectional - both charge AND export metered separately
- Export income during peak demand (10-15p/kWh) - genuine V2G income stream
- Suitable for V2G-capable EVs (Nissan Leaf, Kia EV6, BYD ATTO 3, MG4)
- Octopus controls charge/discharge windows automatically
- Same low overnight import rate as IO Go for charging
Cons
- Requires Wallbox Quasar 2 charger (~£5500-£7500 installed)
- EV must be V2G-capable - limited UK options in 2026
- Battery cycling impact - V2G usage uses EV battery cycles
- Setup complexity meaningfully higher than IO Go
- Total return depends on willingness to actively export during peak hours
What's the headline difference?
The fundamental difference: Intelligent Octopus Go is single-direction (you charge your EV during cheap windows; that's it). Intelligent Octopus Flux is bidirectional (you charge during cheap windows AND export from your EV battery back to the grid during peak demand windows).
The bidirectional capability adds an income stream but requires hardware investment most UK EV households don't currently have:
- Wallbox Quasar 2 V2G charger: ~£5500-£7500 installed. The only widely-available UK V2G-certified home charger in 2026.
- V2G-capable EV: Currently Nissan Leaf (2018+), Kia EV6 (2024+ specific trims), BYD ATTO 3 (2024+), MG4 Long Range (2024+).
- DNO connection paperwork: V2G installs require notification to your District Network Operator. Adds 2-4 weeks.
Households with this setup already in place can layer the additional Flux income on top of their existing IO Go cheap-charge benefit. Households without it would need to invest £5000+ upfront to access Flux's export income.
What's the income difference?
Worked examples for a typical UK Octopus EV household in 2026:
- Intelligent Octopus Go (standard scenario): Charging 20 kWh per night at ~7p/kWh = £1.40 per night = ~£420 per year on cheap-rate charging vs ~£2200 per year at standard rate. Net annual saving: ~£1700.
- Intelligent Octopus Flux (full V2G scenario): Same charging savings (~£1700/year) + ~£300-£800/year additional V2G export income during peak windows. Total annual benefit: ~£2000-£2500.
- Intelligent Octopus Flux (light V2G scenario): Charging savings + ~£100-£300/year V2G export. Total annual benefit: ~£1800-£2000.
The V2G income difference is meaningful (£300-£800/year vs zero) but doesn't justify the £5000+ hardware investment in isolation. For households with the hardware already in place for outage resilience or future-proofing, Flux is the obvious choice. For households starting from scratch, Go is the right default.
Are there other considerations?
Three additional factors that affect the choice:
- EV battery cycling. V2G actively uses EV battery cycles. Light V2G usage (few hundred kWh exported per year) has minimal impact; heavy V2G (thousands of kWh per year) measurably accelerates battery wear and may affect EV warranty in some cases.
- Outage resilience. Flux's bidirectional capability includes V2H (Vehicle-to-Home) mode - your EV becomes a backup battery during power outages. Particularly valuable for households experiencing more than 1-2 outages per year.
- Future-proofing. V2G is the direction the UK EV market is moving. Investing in V2G hardware now positions you for cheaper hardware and better tariffs in 2027-2028. Early adopters often pay a premium for being early.
Who is each tariff right for?
Pick Intelligent Octopus Go
Standard EV households
Pick Intelligent Octopus Flux
V2G early adopters
Can you switch between them?
Yes - both tariffs are Octopus EV tariffs and switching between them is straightforward via the Octopus Energy app. Typical scenarios:
- Starting with IO Go, upgrading to Flux: When you purchase a V2G-capable EV and Wallbox Quasar 2, switch to Flux to unlock the export income.
- Starting with Flux, downgrading to IO Go: If your V2G EV is replaced with a non-V2G EV, switch back to IO Go for continued cheap charging.
- Mid-year switches: Switching between Octopus tariffs typically takes 1-2 weeks to take effect.
Both tariffs are reviewed annually; rates can shift. Always check current rates before committing to one over the other.
Frequently asked questions
Q01Which Octopus EV tariff is most popular in the UK?
Q02Will Flux pay back the Wallbox Quasar 2 investment?
Q03Can I have both tariffs simultaneously?
Q04What EVs work with Intelligent Octopus Flux?
Q05Does Flux work with any home charger?
Q06Is the export income tax-free?
The bottom line
For UK Octopus customers with EVs in 2026, the choice is straightforward: Intelligent Octopus Go for the standard EV household setup (saves ~£1700/year on charging); Intelligent Octopus Flux for households with V2G-capable EVs and Wallbox Quasar 2 already installed (adds ~£300-£800/year export income on top of cheap charging).
For most UK EV households in 2026, Go is the right default. Flux is the right upgrade only for early V2G adopters who've already made the £5000+ hardware investment for outage resilience or future-proofing reasons.
For the Wallbox Quasar 2 review, see our Quasar 2 V2G review. For the standard smart-tariff context, see our Intelligent Octopus Go review and Tesla Universal Wall Connector review. Octopus Energy publishes current tariff terms.