Octopus Energy Unveils Its Own Nook Home Battery Range, Due in 2027
Octopus Energy announced two home batteries on 22 June: the Nook Cube, a 2 kWh unit that plugs into a socket, and the Nook Colossus, a wall-mounted system for homeowners. Both are due in 2027, and no price has been published yet.
What Octopus announced
Octopus unveiled the range at its Energy Tech Summit in London on 22 June 2026. It says it is the first major UK energy supplier to sell its own home battery range directly to customers.
The Nook Cube is roughly shoebox-sized, holds 2 kWh and plugs into a standard socket. Octopus says extra units can be added through its app, up to 10.5 kWh in total. It is aimed at renters and people in apartments.
The Nook Colossus is wall-mounted, installed by an engineer and aimed at homeowners. It comes in 5 kWh and 10 kWh versions and can be stacked up to 30 kWh. Octopus says both ranges work with solar panels and come with a 12-year warranty.
What we could not confirm
The announcement leaves a lot open. We could not find a price, the maximum charge and discharge power, or the terms behind the 12-year warranty, such as cycle limits or the capacity it guarantees at the end. Octopus says the range will be available to its customers in the UK, Germany, Italy, Spain and France from 2027, with no month given.
We also could not confirm how the Cube returns stored energy to the home, or how rules for a socket-connected battery would apply in each country. Those details decide what a unit can actually run, so treat the headline capacity as only part of the picture. Our battery capacity guide explains why power and energy both matter.
Why it matters
Octopus is a supplier first, so a battery sold alongside its smart tariffs and app is a different proposition from hardware bought separately. The company says pairing a battery with its smart tariffs can increase savings, and describes the potential as 'hundreds of pounds' a year. That is a company claim, not a guarantee, and we have not tested it.
It fits a theme we have covered before: software increasingly decides how much value a battery delivers, and dynamic tariffs are changing the role of home batteries. Octopus also points to more than 10 million renting households in Britain as a potential market, based on ONS 2024 dwelling data. That is its own estimate of who could benefit.
What to do now
Nothing is on sale, so there is nothing to buy yet. If you are weighing up a battery today, start from your own usage: the home battery calculator gives a first size estimate, and our home battery storage pages list installed options. We will update our coverage when Octopus publishes prices, power ratings and warranty terms.
Sources
- Octopus Energy: Octopus Energy launches the Nook range of home batteries
- Renewable Energy Magazine: Octopus Energy launches the Nook battery range
- Octopus Energy blog: Energy Tech Summit 2026 round-up
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