The best overnight electricity tariffs for solar, battery storage, heat pumps and EV charging

If you're investing in solar PV, battery storage, an air source heat pump or an electric vehicle, your electricity tariff can make a pivotal difference to your annual bills.

Most of our clients across South West Wales are now charging their batteries overnight for under 7p/kWh before using that stored energy throughout the day. Combined with solar generation, this can dramatically reduce electricity costs.

Why Your Energy Tariff Matters

Installing renewable technology is only part of the journey.

Choosing a tariff with a cheap overnight electricity rate allows you to:

• Charge your home battery overnight

• Run your air source heat pump more economically

• Charge your electric vehicle for a fraction of the daytime cost

• Store low-cost electricity for use during expensive daytime hours

• Reduce your reliance on the National Grid during peak pricing

Combined with solar PV, many households across Swansea, Neath Port Talbot, Bridgend, Brecon, Cardiff and Carmarthenshire, as well as the Gower Peninsula are significantly reducing their annual electricity bills.

Please note: we install solar PV, battery and heat pumps for clients in Swansea, Neath Port Talbot, Brecon, Bridgend, Cardiff and Carmarthenshire. Energy prices vary by region. So these figures are representative of tariffs available in Wales during 2026 and check against your own postcode before switching.

Please note: When a supplier says they provide 100% renewable electricity, it doesn't mean the electricity arriving at your home is physically different from your neighbour's. Everyone draws electricity from the same National Grid.

Instead, suppliers purchase enough renewable electricity (supported by Renewable Energy Guarantees of Origin, or REGOs) to match the amount of electricity their customers use over the course of a year.

So while the electrons coming into your home are mixed with electricity generated from wind, solar, hydro, nuclear and gas, choosing a renewable tariff increases demand for renewable generation and supports investment in cleaner energy.

Which tariff is best?

🏆 Best Overall: EDF GoElectric

For households with:

• Solar PV (with export)

• Battery Storage

• Air Source Heat Pump

• Electric Vehicle

EDF is arguably the strongest all-round package in 2026.

Pros

✅ 6.99p/kWh overnight

✅ Seven-hour cheap period (11pm-6am)

✅ Excellent for charging home batteries

✅ Works with any EV charger

✅ Competitive 15p export tariff

Cons

• Standing charge is slightly higher than some competitors.

• It's Nuclear.

  
  

Best for Tesla, MyEnergi & Smart Chargers

Octopus Intelligent Go

If your charger or vehicle is compatible, Intelligent Go remains an excellent choice.

Benefits include:

• Automatic smart charging

• Extra cheap charging slots

• Excellent customer service

• Strong smart home integration

However:

• Daytime electricity is usually more expensive than EDF.

• Export payments have reduced from previous levels.

  
  

Best if you only have an EV

If you don't yet have solar or battery storage:

• British Gas (but not if choosing a renewable tariff is important to you)

• OVO

• E.ON

all offer competitive charging costs without requiring a complicated smart energy setup.

Which is Best for Heat Pumps?

Unlike gas boilers, air source heat pumps use electricity throughout the day. That means the cheapest overnight tariff isn't always the best choice.

When choosing a tariff, we recommend considering:

• Overnight charging rate

• Daytime electricity price

• Standing charge

• Export payments for solar electricity

• Compatibility with home battery storage

  
  

For many homes across South West Wales, EDF GoElectric currently offers one of the strongest overall combinations for households with heat pumps, battery storage and EV charging.

Which tariff suits your home?

Solar only

Recommended: Octopus (good export options) or EDF if export is available in your area and you are comfortable supporting a nuclear supply.

Solar + Battery

Winner: EDF

The long seven-hour overnight window lets you completely recharge most batteries before breakfast.

Heat Pump

Heat pumps benefit from lower daytime rates as well as cheap overnight charging.

For many homes, EDF currently offers one of the best balances between:

• overnight price

• daytime price

• export payment.

  
  

Solar + Battery + EV

This is where the savings become significant.

A typical winter routine could be:

• Charge the battery overnight at around 6.99p/kWh

• Use stored electricity all day

• Charge the EV overnight

• Export excess solar in summer at up to 15p/kWh

This combination can substantially reduce annual electricity bills compared with remaining on a standard tariff.

Things to check before switching

• ✔️ Do you have a smart meter?

• ✔️ Does your EV or charger meet the tariff requirements?

• ✔️ Are you exporting solar electricity?

• ✔️ Will you charge a home battery overnight?

• ✔️ Compare the day rate and standing charge, not just the overnight rate—especially if you have a heat pump, as daytime usage can be significant.

Final thoughts

For many households in South West Wales installing solar PV, battery storage, air source heat pumps and EV chargers in 2026:

🥇 EDF GoElectric currently offers the strongest overall value thanks to its very low overnight rate, generous seven-hour charging window and competitive export tariff. Please note: this is a nuclear power source.

🥈 Octopus Intelligent Go remains an excellent choice if you have a compatible smart EV or charger and value its smart charging ecosystem. Plus it's 100% renewable electricity

🥉 E.ON Next Drive is a solid alternative for EV-focused households, though its export tariff may be less attractive if you expect to export a lot of solar generation.

Any comparison should always be tailored to your home's annual consumption, solar generation and battery size, as the cheapest tariff on paper is not always the lowest-cost option over a full year.

If you are considering installing a heat pump, solar panels or battery power, or an EV charger, get in touch with us on:

info@limitless-energy.co.uk

01792 361 638

www.limitless-energy.co.uk