Octopus Nook vs Habo Energy: Price Comparison 2026

Why this comparison comes with an asterisk

If you have landed here after reading about the Octopus Nook launch, the first thing to be clear about is that Octopus did not announce a price. Octopus announced the Nook range at its Energy Tech Summit on 22 June 2026 (Octopus launch announcement, 22 June 2026). The announcement gives no Cube price, no Colossus price, no per-kWh figure, and no on-sale date beyond "next year".

So there is no Nook price to put in a head-to-head table yet. The known number is the Habo Energy price: from £2,499 fully installed for a 5 kWh STREAM or AC 5000, electrician-wired (G98 / BS 7671), 0% VAT and a 10-year warranty, on the install waitlist. The Nook column below only shows what Octopus has announced.

The headline price comparison

Here is the side-by-side as it stands. The Nook details are from the Octopus launch announcement, 22 June 2026; the Habo figures are published prices.

The single most useful row is price per usable kWh of installed storage, because that is the only fair way to compare a 2kWh box, a 10kWh wall unit and a 5 kWh STREAM or AC 5000. On that measure the Habo battery is about £500 per kWh, and neither Nook product has a published figure to compare it with yet.

Why there is no Nook Cube number

Octopus has not published a Cube price, so there is nothing sourced to work back from, and we do not estimate one. If Octopus publishes a Cube price, we will add it here.

What we can say is that the Cube only stores 2kWh. To reach Habo-equivalent capacity you would need two to three Cubes and a spare socket for each, and you would still have no whole-home backup. The Cube is the right product for renters and flats with no install path, not a cheaper route to a full home battery.

Why there is no Nook Colossus number

The Octopus launch announcement, 22 June 2026 says the Colossus comes in 5kWh and 10kWh models that stack up to 30kWh, is engineer installed and has a 12-year warranty. It does not give a price, so we do not estimate one. Habo Energy prices a 5 kWh STREAM or AC 5000 installed system from £2,499, about £500 per usable kWh. When Octopus publishes a Colossus price, that is the number to compare it with.

The bit the price tag hides: when you start saving

A price comparison that stops at the sticker misses the biggest number, which is the saving you forgo while you wait. A Habo battery starts earning once we can book and fit it. The Nook does not go on sale until 2027, and Octopus has not given a month.

For the Colossus to win on lifetime cost, it has to launch before 31 March 2027 so 0% VAT still applies, undercut the Habo price by more than about £545 to £615 (best case), and avoid a long install queue. Without a published Colossus price, none of that can be checked yet.

So which is cheaper?

The bottom line

We cannot give you an exact Nook-versus-Habo price because Octopus has not published one and will not sell the Nook until 2027. What we can say is that the Habo Energy battery has a published price from £2,499 fully installed for 5 kWh STREAM or AC 5000 with 0% VAT and an electrician hardwire (G98 / BS 7671). The Cube is smaller and aimed at renters. If a real Nook price lands and changes that, we will update this page.