Home → Regions → South Wales

Home Battery Savings in South Wales

On Octopus Go in South Wales, you pay 9.5p/kWh overnight and 31.67p during the day. An 11.5kWh battery charges at the cheap rate and saves you £838/year.

TL;DR

Octopus Go in South Wales charges 9.5p/kWh overnight (00:30–05:30) and 31.67p during the day. An 11.5kWh Habo Energy battery charges overnight and powers your home during the day, avoiding the 31.67p daytime rate. That’s a saving of 22.2p on every stored kWh, or approximately £838/year.

Octopus Go rates in South Wales

South Wales: 31.67p daytime / 9.5p overnight

On the current Octopus Go 12-month fixed tariff (GO-FIX-12M-26-03-23), households in South Wales pay 31.67p/kWh during the day and 9.5p/kWh overnight (00:30–05:30), with a standing charge of 61.74p/day. The off-peak rate is the same across all regions; the daytime rate varies.

For comparison, the standard variable tariff in South Wales is 24.9p/kWh (Ofgem cap, Q2 2026) – a flat rate with no cheap overnight window.

This covers postcodes: CF, LD, NP, SA – including Cardiff, Swansea, Newport. Your distribution network operator is National Grid Electricity Distribution.

About South Wales

South Wales has a significant proportion of older terraced housing in the valley communities, many of which are solid-walled properties with higher-than-average heating demands. Welsh Government energy efficiency schemes are available alongside UK-wide programmes, and the region benefits from strong coastal wind resources.

According to MCS data, at least 3,788 certified home battery installations have been completed in the South Wales region since September 2023 – part of a nationwide surge in domestic battery uptake.

Your savings with an 11.5kWh battery

The battery charges overnight at 9.5p and powers your home during the day, avoiding the 31.67p daytime rate. The saving is the difference between those rates, multiplied by how much energy the battery delivers each cycle.

9.5p
Octopus Go
overnight rate
31.67p
Octopus Go
daytime rate (South Wales)
22.2p
Saved per kWh
on stored energy
£838
Estimated annual saving
(11.5kWh battery)
The calculation (Octopus Go rates for South Wales, April 2026)
11.5kWh × 90% round-trip efficiency = 10.35kWh usable per cycle
(31.67p daytime − 9.5p overnight) × 10.35kWh = 229p saved per day
229p × 365 days = £838/year

Rates from the Octopus Energy API (product GO-FIX-12M-26-03-23, April 2026). Assumes one full battery cycle per day. Actual savings depend on your usage patterns.

How South Wales 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.

RegionGo daytime rateSpreadAnnual saving
South Wales31.67p22.2p£838
West Midlands32.02p22.5p£851
East Midlands32.32p22.8p£862
Northern England32.36p22.9p£864
London32.64p23.1p£874
South West England33.15p23.6p£893
Northern Scotland33.72p24.2p£915
North West England33.75p24.2p£916
South East England33.87p24.4p£921
Eastern England34.32p24.8p£938
Southern England34.42p24.9p£941
Yorkshire34.49p25.0p£944
Southern Scotland34.54p25.0p£946
North Wales & Merseyside35.73p26.2p£991

What Habo Energy offers

One 11.5kWh battery. Everything included – inverter, cables, mounting kit, and MCS certified installation. Pre-configured for UK time-of-use tariffs. If you’d prefer to use your own electrician, that’s fine too.

Get £100 off at launch

Join the Habo Energy waitlist for early access and launch pricing.

Get early access