Octopus enters the home battery market with two distinct systems — Nook Cube and Nook ColossusRenters receive the Nook Cube, a plug-in battery requiring no installation workHomeowners get Nook Colossus, which can be expanded to a substantial 30kWh capacityOctopus Energy has unveiled a new home battery range called Nook, aiming squarely at the household storage market.Announced at the company's recent Energy Tech Summit, the range includes two distinct products built for different types of customers.One option targets the more than 10 million renting households and tenants in Britain, while the other suits homeowners seeking a permanently installed system.Two battery systems built for different householdsOctopus says the plug-in option for renters, called Octopus Nook Cube, is a compact, shoebox-sized 2kWh battery that connects to any standard wall socket.Customers can add extra units through the Octopus app, allowing total storage to scale up to 10.5kWh over time.For homeowners, Octopus is launching a wall-mounted, engineer-installed system called Octopus Nook Colossus, available in 5kWh and 10kWh configurations.Larger households can stack additional units to reach a maximum capacity of 30kWh, positioning it as a genuine rival to Tesla's Powerwall lineup.Both systems work alongside existing solar panel installations and carry a 12-year warranty as standard.Unlike many existing systems, the battery connects directly to a standard household socket without requiring an engineer installation or property modifications.Octopus plans to begin sales of the batteries next year across the UK, Germany, France, Italy, and Spain.That timeline means households hoping for immediate alternatives to Tesla Powerwall products will need to wait until at least 2027.Savings claims rest on existing smart tariffsHome batteries store electricity when prices fall before releasing it later when tariffs become significantly more expensive for consumers.Octopus says customers can increase savings further by pairing battery systems with its own smart electricity tariffs and plans.According to the company, those tariffs have already helped customers collectively save almost £1 billion on energy expenditure.“Home batteries are a brilliant piece of tech and one of the smartest ways to cut energy bills right now,” said Greg Jackson, Founder and CEO of Octopus Energy Group. “Offering Octopus batteries to our customers is a big step in our mission to help people to tap into the cheapest energy possible.”Demand for domestic storage has reportedly accelerated following instability in the Middle East and increasingly unpredictable energy prices worldwide.Across the UK, Spain, and France, Octopus says it has already installed almost 26,000 solar and battery systems.This launch makes Octopus the first major British energy supplier to sell its own battery range directly to customers.Whether a delayed arrival affects enthusiasm remains uncertain, although rising energy costs may leave little shortage of interested buyers.