[Residential Guide] Best Energy Tariffs in Wales (Updated Monthly)

We review the cheapest and most competitive energy tariffs available in Wales.

Last updated: 17th March 2026

Notes:

• Several supplier's tariffs aren’t available right now due to global energy prices changing quickly. During this time, most only able to offer a limited selection of tariffs. We’ll update this page with the latest available tariffs at our next monthly update.

• As of 1st March 2026, Octopus has reduced their export rates from 15p/kWh to 12p/kWh.

Choosing the right electricity tariff is no longer a simple matter of comparing unit rates. For households and businesses with solar panels, battery storage, electric vehicles or heat pumps, energy pricing has become a strategic decision.

The structure of your tariff — not just the headline price — can materially influence whether your system delivers modest savings or exceptional returns.

In this guide we will cover the key considerations when choosing an electricity tariff, and looking at the best strategies depending on your situation.

This guide is written based on latest tariffs available for households in Wales.

We will also recommend an online tool that you can use to refine your selection.

1) Why tariffs matter once you have renewables

If you’re on a standard single-rate tariff, you mostly pay whatever the fixed rate is whenever you use electricity.

Once you add solar, battery storage, an EV, or a heat pump, you can start using time-of-use tariffs. These feature:

• Off-peak windows (cheap electricity, typically overnight, sometimes midday)

• Peak windows (expensive electricity, often 4–7pm)

• Export payments for energy you send back to the grid (Smart Export Guarantee-type arrangements)

Using the right tariff, and the adequate usage and charging strategy is essential to make the most of your kit.

2) Tariff Table

Provider	Tariff name	Import (£p/kWh)	Export (£p/kWh)	Standing charge (£p/day)	Note
100 Green	Tide Smart	9.62 night 33.53 day 49.53 evening	12 all day	54.98
EDF	Export 12m + FreePhase	17.23 night 22.16 day 38.33 evening	15 all day	51.79
British Gas	Home battery	14.7 night 29.4 day 29.4 evening	15.1 all day	50.46
E On	Next Export Exclusive v3 + Next Smart Saver Fixed	13.27 night 18.48 day 45.41 evening	6 all day	57.86
E On	Next Flex Export v1 + Next Drive V17-Fixed 12 month	5.99 night (6h) 28 day 28 evening	6 all day	60	Requires an EV
Good Energy	EV tariff	Currently closed			Only 'EV' rate tariff not requiring an EV
Octopus	10M fixed + Outgoing	28.75	12 all day	51.41
Octopus	Flux	Currently closed
Octopus	Intelligent Flux	Currently closed			Requires a compatible system
Octopus	Go + Outgoing	9.5 night 35.35 day 35.35 night	12 all day	50.48	Requires an EV
Octopus	Intelligent Go + Outgoing	8 night 35.35 day 35.35 night	12 all day	50.48	Requires an EV and compatible system
Octopus	Cosy	16.21 for 3h 3x/day 33.05 day 49.58 night	12 all day	50.48	Best if you have a heat pump and a small battery
Note: Some energy supplier require you to have your gas tariff with them too which may influence your combined gas and electricity cost comparison. The list above is not exhaustive and is based on our review of the market at the time.

2) Which scenario are you in?

Scenario A — Solar only (no battery)

Best tariff type:

• A strong fixed export rate + a competitive standard import tariff

  
  

Why

• Without a battery, you can’t choose when to export excess solar exports when it happens.

• A strong export rate is therefore one of the biggest levers for solar-only households.

• Time-of-use import tariffs can still work, but without storage you’re less able to avoid expensive peak windows if your usage lands there.

Recommended tariff:

• Octopus Outgoing providing an export rate of 12p/kWh paired with a compatible Octopus import tariff

Scenario B — Battery storage only (no solar)

Best tariff type:

• A time-of-use battery tariff (or an EV tariff if it allows the whole home cheap rate).

Why

• This is classic arbitrage: charge the battery during cheap windows and discharge during expensive periods.

• Your goal is to avoid buying electricity at peak prices.

Recommended tariff:

• The time of use tariffs with the lowest night rate, i.e. 100 Green's Tide Smart

Tip:

• There are currently no export tariffs available to homes with just a storage battery, which is unlikely to change any time soon.

• Good Energy EV Charge is currently the sole tariff available for battery-only households without an EV. If this tariff disappears, the financial benefit of owning a battery could reduce dramatically.

Scenario C — Solar + battery (no EV)

This is where “tariff strategy” matters a lot.

Best tariff types:

1. Solar + battery specific tariffs (often with different import/export rates by time)

2. Dynamic/import tariffs if your battery is “intelligent” and can respond to prices

3. Pair with either:

   • Fixed export (simple, predictable), or

   • Time-based export (better if you can export at peak)

     
     

Why

• Your battery can:

  • Store excess solar for later (self-consumption)

  • Charge from the grid when cheap (especially in winter)

  • Potentially export at higher rates during peak windows

Recommended tariff:

• With Octopus Flux and Good Energy EV Charge currently closed, we recommend looking at 100 Green's Tide Smart, EDF's Export 12m + Freephase and British Gas' Home battery tariff.

Tip:

• Whilst households with just solar and battery could use EV tariffs with a super cheap off-peak overnight window in the past, like Octopus Go and E. On Drive, these companies have now clarified in their terms and conditions that this is no longer allowed and they now require proving ownership of an EV before being able to sign up.

Scenario D — Heat pump + solar + battery (no EV)

You’re balancing two things:

• Heat pumps can be energy-hungry in cold spells

• Time-of-use tariffs can reduce the cost if you can shift consumption or use storage

  
  

Best tariff type:

• A heat pump tariff, or

• A battery-friendly time-of-use tariff, depending on your usage pattern.

Off-peak windows options:

• Daytime cheap window tariff can suit people at home during the day (e.g., retirees), because they can heat when it’s cheaper.

• Multiple off-peak windows are powerful if you have battery storage and can “top up” several times per day to avoid peak.

Recommended tariff:

• Same tariffs as Scenario C above + Octopus Cosy.

Tip:

• Pre-heat during cheap windows, then reduce setpoint during peak (4–7pm). The building’s thermal mass can carry you through the expensive period, reducing peak imports.

Scenario E — EV only

You usually want an EV tariff with an overnight cheap window.

Two EV tariff “types”

• Non-intelligent EV tariffs: Fixed cheap window (e.g., midnight–5am). No smart scheduling.

• Intelligent EV tariffs: Your EV or charger connects to the supplier, which can schedule charging when it’s cheapest, often with better pricing.

  
  

Best tariff

• If your EV/charger supports it, intelligent EV tariffs are typically best value because the supplier can shift your charging around and rewards you for the flexibility.

Recommended tariff:

• E On's Next Drive V17-Fixed

Scenario F — Solar + battery + EV

Best tariff type:

• An EV tariff that allows whole-home off-peak (and ideally works with your battery charging too), plus a strong export option.

Why this can be the “holy grail”

• Charge EV and battery overnight at low rates

• Run the home from the battery during peak times

• Use solar to top up battery in the day

• Potentially export surplus solar/battery at a higher rate (depending on export tariff)

  
  

What decides the winner for you:

• Do you drive more (EV import savings dominate) or export more (export rate dominates)?

• How often do you run out of battery before 4–7pm in winter?

• Can your system charge quickly enough in the available cheap window?

Recommended tariff:

• E ON's Next Flex Export v1 + Next Drive V17-Fixed 12 month

• Octopus Go

• Octopus Intelligent Go

Scenario H — Solar + battery + EV + heat pump (everything)

This is where the “best tariff” is genuinely scenario-specific.

Two common outcomes:

• If EV mileage is high, an EV tariff plus battery can outperform heat-pump tariffs because overnight cheap energy can feed both the house and heating.

• If heating demand dominates and you need multiple daily cheap windows, a heat pump tariff with several off-peak blocks plus battery can win.

If this is your situation, we recommend using the Tim and Kat Greenwalk tool below.

3) Tariff Comparison Tool

While the scenarios above provide a solid rule of thumb, every household uses energy differently.

If you would like to choose your tariff based on your exact energy data or would like to dig deeper into your strategy, we highly recommend using the Tim and Kat Greenwalk Tariff Comparison Tool. Simply enter your system details (solar output, battery size, EV mileage, heat pump use), and it estimates what each tariff would cost you over a year.

Get in touch and further resources

If you would like a personal advice on choosing your tariff do get in touch with the Ulex Energy team.

To maximise your savings, we recommend you also read our article on Top Tips for Maximising Your Solar Savings.

Update history:

March 2026 – Added tariff table and included additional suppliers including 100 Green, EDF and British Gas which have become popular.

February 2026 – Original guide.