WattSaver for Octopus Energy

Find cheaper times to use electricity

WattSaver helps Octopus Energy customers find cheaper times to run appliances, charge devices, and plan around changing electricity prices.

Pick what you want to run, set how long it takes, and WattSaver scans the available import price slots to show the best start time and estimated cost. Use it for washing machines, dishwashers, tumble dryers, immersion heaters, battery charging, or anything else that can wait for a cheaper slot.

It works with Octopus import and export tariffs, including Agile, Tracker, Flexible, Intelligent Octopus Go, and compatible smart tariffs. Connect your Octopus account to auto-detect your tariffs, or choose a product and tariff manually if you just want to explore prices before switching.

What WattSaver does

• Find the cheapest import-price slots for a device run time.
• Set practical constraints such as earliest start, latest finish, delayed start, and finish-by times.
• Save and load common appliance templates for quick recall.
• View today and tomorrow's half-hour prices, with import and export charts where available.
• Get optional notifications when selected rates are published.
• See Intelligent Octopus Go cheap slots and receive cheap-slot alerts where supported.
• Use WattSaver on iPhone and iPad.

Solar, battery, and Predbat

If you use Predbat, WattSaver Pro can import your Predbat plan page and show that plan data alongside Octopus prices. This can add chart overlays for solar forecast, excess solar, and battery charging windows, and scheduling can optionally prefer those imported windows.

WattSaver does not measure your solar generation or battery state directly; solar, excess solar, and battery information is read from the Predbat plan URL you provide.

Free and Pro

Free features include basic scheduling, current prices, and one saved template. Some advanced features require the one-time WattSaver Pro purchase.

Not with Octopus Energy?

If you're not with Octopus Energy but are interested in joining, consider doing so using this affiliate link. Both you and us will get £50 off our electricity bills for joining.

How to get an API key and account number

You can get an API key from your Octopus Energy dashboard, by following this link. You will also need your account number, which you can find in your profile by following this link.

WattSaver is an independent app and is not affiliated with Octopus Energy or Predbat.

For any questions or support queries, please contact us.