Octopus Agile is a time-of-use electricity tariff that changes price every 30 minutes, tracking the wholesale market. For solar panel owners — especially those with a home battery — it creates an opportunity that flat-rate tariffs simply do not offer: charge your battery when electricity is practically free (or even negative-priced), then self-consume your solar generation during the day and avoid the expensive peak periods entirely. Done well, combining Octopus Agile with solar and a battery can push annual savings well above what solar alone would deliver.
How the Octopus Agile Tariff Works
Unlike standard variable tariffs that charge a single unit rate around the clock, Octopus Agile prices electricity in 48 half-hour slots across each day. Prices are published at around 4pm the day before, so you — or your home automation system — can plan accordingly. Unit rates typically range from around 7p/kWh in the small hours to 35–50p/kWh during peak evening demand (roughly 4pm–7pm). During periods of very high renewable generation, prices can go negative: Octopus pays you to use electricity.
The standing charge on Agile sits around 40–50p per day, slightly higher than some standard tariffs. But for households that shift consumption to cheap slots, the unit rate savings more than compensate. Ofgem’s tariff guidance confirms that time-of-use tariffs are subject to the same consumer protections as standard products, so switching carries no additional risk.
Plunge Pricing: When Electricity Goes Free (or Negative)
Negative pricing periods — nicknamed “plunge pricing” — occur when the UK grid has surplus renewable generation, often on windy nights or sunny weekend afternoons. During these windows, Agile customers receive up to 100p/kWh credit for consuming electricity. For a battery owner, this is pure arbitrage: fill a 10 kWh battery at -20p/kWh, then displace 10 kWh of evening electricity at 35p/kWh, and you have generated around £5.50 of value from a single overnight window.
Combining Octopus Agile with Solar Panels and a Battery
Solar panels alone work well with any tariff — you generate electricity during daylight hours and avoid buying those units from the grid. But Agile unlocks a second layer of value for solar-plus-battery systems. Here is how the daily cycle looks in practice:
- Overnight (11pm–7am): Battery charges from the grid during the cheapest Agile slots, often 7–12p/kWh. On negative-price nights, the battery charges for free or earns credit.
- Morning (7am–11am): Solar generation begins. The battery, already charged, supplements solar to cover morning demand. Agile rates are rising but still moderate.
- Midday (11am–3pm): Peak solar generation. Surplus solar charges the battery (if not already full) or is exported. If the battery is full from overnight charging, surplus flows to the grid under your SEG tariff.
- Evening peak (4pm–7pm): Agile prices spike. The battery discharges to cover household demand, avoiding the most expensive electricity of the day. No grid draw needed.
This stacking effect — cheap grid charging at night, solar self-consumption by day, battery discharge at peak — is the core of what makes Agile genuinely compelling for solar households. Without a battery, you still benefit from lower overnight rates for appliances you can run at night, but you miss the most significant arbitrage opportunity.
Octopus SEG Rates: What You Earn When You Export
Octopus Energy offers two Smart Export Guarantee tariff options that pair particularly well with solar:
| SEG Tariff | Export Rate | Best for |
|---|---|---|
| Octopus Outgoing Fixed | 15p/kWh (fixed) | Predictable income, no smart meter required |
| Octopus Outgoing Agile | Variable, tracks Agile import price | Solar-plus-battery owners who can time exports |
Outgoing Agile is the more sophisticated option: your export earnings track the same half-hourly price curve as your import costs. That means if you can hold surplus solar in a battery and export during the 4–7pm peak, you might earn 30–45p/kWh instead of the 15p fixed rate. Timing exports precisely requires either a smart battery system with Agile integration (such as a GivEnergy or Tesla Powerwall with Octopus integration) or manual scheduling. See our Smart Export Guarantee guide for a full comparison of current SEG rates across all major suppliers.
Real Savings Examples: Agile + Solar vs Standard Tariff
The savings from combining Agile with solar depend heavily on your battery capacity, solar system size, and how actively you manage exports. Here are three realistic scenarios for a 4 kWp solar system in the Midlands:
| Scenario | Setup | Est. Annual Saving vs Standard Tariff |
|---|---|---|
| Solar only, standard tariff | 4 kWp, no battery, fixed SEG 15p | £700–£900 |
| Solar + Agile import, fixed SEG | 4 kWp, no battery, Agile import, fixed SEG 15p | £850–£1,100 |
| Solar + battery + Agile import and export | 4 kWp + 10 kWh battery, Agile both ways | £1,400–£2,000 |
The Energy Saving Trust estimates that a typical solar installation saves £600–£1,400 per year on a standard tariff. Adding Agile with a well-managed battery pushes households toward the upper end of that range and beyond it. The leap from the first to the third scenario is substantial, but it requires capital investment in a battery and some active energy management.
A household with a 4 kWp solar system and a 10 kWh battery on Octopus Agile can realistically save £1,400–£2,000 per year compared to a standard variable tariff — roughly double what solar alone would deliver.
Automating Agile: Smart Batteries and Home Energy Systems
Manually checking Agile prices every day and adjusting your battery schedule is possible but tedious. The more practical approach is a battery or inverter system that integrates directly with Octopus Agile and automates charging and discharging decisions. Several products support this natively:
- GivEnergy with GivTCP / EV charger: Supports Agile-aware scheduling through third-party automation tools. Popular in the UK solar community.
- Tesla Powerwall 3: Octopus Agile integration available directly through the Tesla app, allowing automatic charge scheduling based on next-day prices.
- Solis hybrid inverter + Home Assistant: Many UK solar owners use Home Assistant with the Octopus Energy integration to automate charging based on Agile slots without paying for a proprietary solution.
- Octopus Energy’s own tools: The Octopus app shows tomorrow’s prices and, with compatible hardware, can trigger smart charging schedules automatically.
Our home battery storage guide covers which battery systems currently offer the best Agile integration and value for money in 2026.
Is Octopus Agile Worth Switching to If You Have Solar?
The short answer: almost certainly yes if you have a battery, and probably yes even without one. Here is how to think about it:
With a battery: Strong case to switch
If you already have a home battery or are planning to buy one alongside solar, Agile is the natural tariff choice. The arbitrage between cheap overnight charging and expensive evening discharge is where the real financial benefit lies. Even modest battery sizes (5 kWh) can deliver meaningful additional savings over a flat-rate tariff.
Without a battery: Worthwhile with behaviour change
Without a battery, you still benefit from Agile by running appliances (dishwasher, washing machine, EV charger) during cheap overnight slots and relying on solar to cover daytime demand. The savings are less dramatic but still meaningful — typically £150–£300 per year above what you would save on a standard variable tariff, depending on your consumption patterns.
Who should think carefully before switching
Agile is less well-suited to households with fixed, inflexible consumption patterns — those who cannot shift appliance use to cheap periods, have no battery to smooth out peak costs, and have high evening demand that cannot be avoided. In those cases, a standard variable tariff or a fixed-rate deal might provide better value. Use our solar savings calculator to model your specific situation before switching.
What to Check Before You Switch to Agile
- Smart meter required: Octopus Agile requires a second-generation smart meter (SMETS2). If you do not have one, Octopus can arrange installation free of charge, though there may be a wait.
- MCS certification: Your solar installation must be MCS-certified to qualify for the Smart Export Guarantee and pair with an Outgoing tariff.
- Battery compatibility: If you plan to automate Agile charging, confirm your battery system supports Agile price integration before buying.
- Exit fees: Agile is a variable tariff with no exit fees, so you can switch away if it does not work for you.
Octopus Agile paired with solar and a smart battery is one of the most financially efficient energy setups available to UK homeowners right now. The combination rewards both the upfront investment in solar hardware and the willingness to manage consumption actively. For those prepared to engage with it, the savings are real and significant. Browse the SolarBlog guides for more detail on each component of a solar-plus-battery-plus-smart-tariff setup.