plug-in battery · checked 2026-09-03
Octopus Energy Nook Cube
Octopus Energy's plug-in battery for renters and flat-dwellers, announced 22 June 2026: a shoebox-sized 2 kWh Cube that plugs into a standard socket, stacks to 10.5 kWh, and pairs with Octopus smart tariffs via the app. Sale expected in 2027, so no price, output figures or connection paperwork exist yet.
UK rules check
Still checking. Announced 22 June 2026; maker says standard-socket plug-in with no complex installation, but UK connection paperwork is not published yet. Expected on sale 2027.
Checked 2026-09-03
Price snapshot
No confirmed price yet
Not launched: announced 22 June 2026, sale expected 2027, no price given.
Source: Octopus Energy Nook press release · checked 2026-09-03
Who it suits
- Renters and flat-dwellers with a spare standard socket
- Octopus customers on a smart tariff who can charge cheap overnight
- Anyone able to wait until the 2027 sale
Who should skip it
- Anyone who needs a battery now: it is not launched
- Households wanting a large wall-mounted system (Octopus positions the Colossus for that)
What you need
- A standard household socket
- The Octopus app
- An Octopus customer account (per the launch announcement)
- Purpose-built for renters: standard socket, no complex installation (maker claim)
- Stacks from 2 to 10.5 kWh as needs grow
- App control with Octopus smart-tariff pairing for cheap-rate charging
- 12-year warranty promised; solar-panel compatible
- Not launched: no price and no exact sale date (expected 2027)
- No output wattage, chemistry, dimensions or backup details published
- Only confirmed for Octopus customers in the UK, Germany, France, Italy and Spain
Common questions
When can I buy the Nook Cube in the UK?
Octopus announced it on 22 June 2026 and says sales start in 2027 for customers in the UK, Germany, France, Italy and Spain. There is no exact date or price yet.
Does the Nook Cube need an electrician to install it?
Octopus says no complex installation is required and that the Cube plugs into a standard socket, managed through the Octopus app. The UK connection paperwork is not published yet, so treat that as the maker's description rather than an approval.
How much energy does the Nook Cube store?
2 kWh per Cube, stackable to 10.5 kWh with extra units. It works with solar panels and Octopus smart tariffs.