Home Battery Savings in London

Octopus Go rates in London

On the current Octopus Go 12-month fixed tariff (GO-FIX-12M-26-10-14, region C, checked 15 October 2026), households in London pay 37.2872p/kWh during the day and 9.4p/kWh overnight (00:30 to 05:30), with a standing charge of 41.22p/day. The off-peak rate is the same across all regions; the daytime rate varies.

This covers postcodes: E, EC, N, NW, SE, SW, W, WC, BR, CR, DA, EN, HA, IG, KT, RM, SM, TW, UB, WD – including Central London, Greater London. Your distribution network operator is UK Power Networks.

About London

London has the lowest rate of rooftop solar installation relative to its population, constrained by the high proportion of flats and conservation areas. Battery storage in London is primarily valuable for tariff arbitrage, with smaller dwelling sizes meaning a 5 kWh battery can cover a larger share of daily usage.

According to MCS data, at least 3,147 certified home battery installations have been completed in the London region since September 2023 – part of a nationwide surge in domestic battery uptake.

Your savings with a 5 kWh battery

The battery charges overnight at 9.4p and powers your home during the day, avoiding the 37.2872p daytime rate. The saving is the difference between what the stored energy would have cost at the day rate and what it cost to charge overnight, allowing for charging losses.

Rates from the Octopus Energy API (product GO-FIX-12M-26-10-14, Octopus Go 12M Fixed, region C, direct debit, checked 15 October 2026). The 90% round-trip efficiency is our assumption, because EcoFlow does not publish one for the STREAM. This is a best case: one full cycle every day, with all of it used at the day rate. Real savings will be lower. Best-case payback on £2,499 fully installed is about 5.1 years. See how we worked it out.

How London compares

The Octopus Go off-peak rate (9.4p) is the same everywhere, but the daytime rate varies by region, so regions with higher daytime rates see bigger savings. Figures below are best-case yearly savings for a 5 kWh battery, worked out the same way for each region (GO-FIX-12M-26-10-14, checked 15 October 2026).

What Habo Energy offers

One 5 kWh EcoFlow STREAM all-in-one box. Inverter in the unit. Electrician-wired to your consumer unit under G98 and BS 7671. From £2,499 fully installed at 0% VAT. This is not a plug-in battery. Plugging a battery into a UK socket and feeding the house is not legal.