Home Battery Savings in South East England

Octopus Go rates in South East England

On the current Octopus Go 12-month fixed tariff (GO-FIX-12M-26-09-29, region J, checked 10 October 2026), households in South East England pay 36.2891p/kWh during the day and 9.5p/kWh overnight (00:30–05:30), with a standing charge of 52.21p/day. The off-peak rate is the same across all regions; the daytime rate varies.

This covers postcodes: BN, CT, DA, GU, HP, KT, ME, MK, OX, RH, SL, TN, TW – including Brighton, Canterbury, Maidstone, Oxford, Milton Keynes. Your distribution network operator is UK Power Networks.

About South East England

The South East has a large base of 1930s suburban housing with good roof orientations and above-average floor areas, making it one of the stronger-performing regions for rooftop solar. Parts of Kent and Sussex are approaching grid hosting limits for new solar connections, making battery storage increasingly important for absorbing generation locally.

According to MCS data, at least 14,008 certified home battery installations have been completed in the South East England 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 9.5p and powers your home during the day, avoiding the 36.2891p 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-26-09-29, Octopus Go 12M Fixed, region J, direct debit, checked 10 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 5.3 years. See how we worked it out.

How South East England compares

The Octopus Go off-peak rate (9.5p) 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-26-09-29, checked 10 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.