Octopus Go vs Octopus Intelligent: Which Is Better for Solar?

If you're running plug-in solar in the UK, your electricity tariff can make the difference between a modest return and a genuinely profitable investment. Two of Octopus Energy's most popular tariffs—Octopus Go and Octopus Intelligent Go—are specifically designed to work with solar and batteries. But which one is right for you?

The short answer: it depends on whether you have (or plan to buy) an electric vehicle with a compatible smart charger. But the full picture is more nuanced, and understanding the differences could save you hundreds of pounds a year.

Octopus Go: The Simple, No-Strings Option

Octopus Go is Octopus Energy's entry-level flexible tariff that rewards off-peak electricity use. Here's what you get:

• Off-peak rate: 7–9p per kilowatt-hour (kWh), typically between 10 PM and 8 AM
• Peak rate: Around 24p/kWh, the rest of the day
• No equipment required: Works with any smart meter; no special charger or integration needed
• Flexibility: You're free to buy any battery or inverter you want

The beauty of Go is simplicity. You get a four-hour window of cheap electricity every night, and if you have a battery—like the EcoFlow DELTA 2—you can charge it during off-peak hours and use that stored energy during the day, avoiding the 24p peak rate altogether.

For a typical household using solar during the day and a battery at night, Go offers a straightforward way to maximise self-consumption without worrying about smart home integration or EV chargers.

Who should choose Go:

• Households with plug-in solar but no electric vehicle
• Anyone who values simplicity over optimisation
• Renters or those who don't want to commit to smart home infrastructure
• Households that will charge their battery manually or on a simple timer

Octopus Intelligent Go: The EV-Focused Smart Tariff

Octopus Intelligent Go is a step up. It's designed for households with an electric vehicle and a compatible smart charger (usually the Zappi by myenergi or the Wallbox Pulsar Plus). Here's the difference:

• Longer off-peak window: Up to 8 hours (often 10 PM to 6 AM), compared to Go's 4 hours
• Smart charging: Your EV charger talks to Octopus. The system automatically charges your car during the cheapest hours
• Battery integration: If you have a home battery like the Anker SOLIX C1000, Intelligent can coordinate charging to make the most of off-peak hours
• Dynamic optimisation: Octopus adjusts charging schedules based on your driving patterns and energy prices

The cost is usually similar to Go—no additional subscription fees in most cases—but you're paying for the convenience and intelligence baked into the system.

Who should choose Intelligent Go:

• Households with an EV and a compatible smart charger already installed
• Homes planning to add both solar and a home battery
• Anyone willing to integrate smart home tech for maximum savings
• Drivers who want their vehicle and home battery managed as a single system

The Solar Angle: How These Tariffs Work with Plug-in Solar

With either tariff, the maths is compelling. Plug-in solar generates electricity during daylight hours, typically 9 AM to 4 PM in the UK. If you self-consume that energy (use it directly), you save the full 24p/kWh peak rate immediately.

But excess generation doesn't save you money unless you:

1. Use it right away (self-consumption, best ROI)
2. Store it in a battery and use it later (self-consumption at different time)
3. Export it to the grid under the Smart Export Guarantee (SEG)

On Octopus Go, you're limited to one 4-hour off-peak window. You'll charge your battery at night, use it in the morning or evening, and rely on solar self-consumption for the rest. This is perfectly sensible for an 800W plug-in solar kit, which rarely overproduces enough to fill a large battery anyway.

On Octopus Intelligent Go, the longer 8-hour window gives you more flexibility. If your solar kit is paired with a large battery, you have more time to take advantage of cheap electricity. You can also charge during off-peak hours even if solar isn't generating, then use that battery to cover expensive peak periods.

The Export Question

Neither Octopus Go nor Intelligent Go offers a formal Smart Export Guarantee (SEG) payment. Octopus Energy does have an informal arrangement for non-MCS certified systems (most plug-in solar falls into this category), but rates are typically 5–10p/kWh—much lower than peak import rates.

If you're exporting energy, you're better off self-consuming it or storing it in a battery. That's where the real savings come from.

Making the Choice

Choose Octopus Go if:

• You don't have an EV or don't plan to add smart EV charging
• You want the simplest setup possible
• You're confident a 4-hour off-peak window meets your needs
• You're cautious about smart home dependencies

Choose Octopus Intelligent Go if:

• You have (or plan to buy) an EV with a compatible charger
• You're installing a home battery alongside solar
• You want sophisticated automation managing both EV and battery
• You trust smart home integration and want optimised savings

Both tariffs make plug-in solar more profitable. The choice ultimately comes down to whether you're also investing in EV charging and how much complexity you're comfortable managing.

For monitoring your actual consumption and exports—regardless of which tariff you choose—a smart monitor like the Emporia Vue 3 is invaluable. Real data beats assumptions every time.

Want to understand how tariffs work on a broader level? See our guide to switching energy suppliers with plug-in solar.