Who are So Energy?
So Energy is a UK-based energy supplier known for its commitment to 100% renewable electricity and excellent customer service. With a focus on simplicity and price transparency, So Energy offers both fixed and variable tariffs.
For EV owners, So Energy provides an EV-friendly tariff with off-peak rates from 12:30 AM to 7:30 AM, a good length window to allow drivers to charge their vehicles at a lower cost overnight. They are a fantastic choice for renewable energy, however, a high tariff rate means that So Energy’s EV tariff is too expensive for us to include in our list of the best EV electricity tariffs for 2025.
- Fixed off-peak rate of 8.5p/kWh between 12am–6am for 12 months
- No exit fees
- E.ON Next Drive Smart is currently E.ON Next’s cheapest EV tariff
- Smart features and eligibility rules apply, so it suits drivers who can reliably charge overnight
- E.ON Next Drive Smart currently advertises an off-peak rate of 8.5p/kWh. E.ON Next Drive advertises 9.5p/kWh between 12am and 6am. Prices and eligibility can vary by tariff structure and customer setup.
* Next Drive Fixed v7 offers fixed priced overnight EV charging 6.7p/kWh between 12am and 7am versus Next Flex standard variable tariff at 27.03p/kWh (national average and will vary by region).
** Next Drive electricity backed by 100% renewable sources, E.ON’s renewable generation assets, agreements with UK generators and the purchase of renewable electricity certificates. The electricity supplied to your home comes from the National Grid. Smart meter required. Exit fees and T&Cs apply.
So Energy Tariff Options
Fixed Tariff
- Guaranteed unit rates and standing charges for the duration of the contract.
- Protection against energy price fluctuations and price cap increases.
- Comes with 100% renewable electricity as standard.
- Ideal for customers who want stability and predictable billing.
So Aspen One Year (12-month fixed tariff)
- Standing charge: 52.12p/day (Eco 7 Electricity), 51.54p/day (Electricity).
- Day rate: 26.21p/kWh (Eco 7), 24.29p/kWh (Electricity).
- Night rate: 19.54p/kWh (Eco 7).
- Gas unit rate: 6.47p/kWh with a standing charge of 29.56p/day.
- Exit fee: £50 per fuel.
So Aspen Two Year (24-month fixed tariff)
- Standing charge: 53.98p/day (Eco 7 Electricity), 53.41p/day (Electricity).
- Day rate: 25.63p/kWh (Eco 7), 23.57p/kWh (Electricity).
- Night rate: 19.42p/kWh (Eco 7).
- Gas unit rate: 6.16p/kWh with a standing charge of 31.12p/day.
- Exit fee: £75 per fuel.
Variable Tariffs
- Rates fluctuate with global energy prices and Ofgem’s price cap adjustments.
- Potential for lower rates if energy prices fall.
- No long-term commitment, allowing more flexibility.
- Suitable for customers comfortable with market-driven pricing changes.
So Flex Green One Year
- Standing charge: 51.18p/day (Eco 7 Electricity), 50.81p/day (Electricity).
- Day rate: 28.93p/kWh (Eco 7), 27.05p/kWh (Electricity).
- Night rate: 21.66p/kWh (Eco 7).
- Gas unit rate: 6.25p/kWh with a standing charge of 31.4p/day.
- Exit fee: None.
So Flex
- Standing charge: 51.19p/day (Eco 7 Electricity), 50.83p/day (Electricity).
- Day rate: 27.44p/kWh (Eco 7), 25.56p/kWh (Electricity).
- Night rate: 20.17p/kWh (Eco 7).
- Gas unit rate: 6.25p/kWh with a standing charge of 31.41p/day.
- Exit fee: None.
So Flex – No Direct Debit
- Standing charge: 56.66p/day (Eco 7 Electricity), 56.69p/day (Electricity).
- Day rate: 28.88p/kWh (Eco 7), 26.91p/kWh (Electricity).
- Night rate: 21.22p/kWh (Eco 7).
- Gas unit rate: 6.58p/kWh with a standing charge of 36.3p/day.
- Exit fee: None.
Pros and Cons of the So Energy EV Tariff
Pros
- Longer Off-Peak Window: The Economy 7 tariff offers lower night rates from 12:30 AM – 7:30 AM, giving flexibility for overnight charging.
- 100% Renewable Energy: Fixed-rate tariffs use only renewable electricity, making it an eco-conscious choice.
- Strong Customer Service Reputation: So Energy has a high Trustpilot rating and has been recognized for customer satisfaction.
- Flexible Switching: Customers can choose between fixed and variable tariffs based on their risk tolerance and budget preferences.
Cons
- Higher Off-Peak Rate Than Some Competitors: Even at 19.42p/kWh (So Aspen Two Year), So Energy’s night rate is higher than Octopus Intelligent (7.5p/kWh) and UW (7p/kWh).
- No Bundled Discounts: Unlike UW, which offers better EV rates when bundling multiple services, So Energy’s pricing remains fixed regardless of additional services taken.
- Peak Rate Could Be More Competitive: The day rates for some tariffs remain relatively high compared to competitors.
Comparing So Energy EV Tariff to Competitors
| Provider | Off-Peak Rate | Off-Peak Hours | Fixed or Variable | Smart Meter Required | Exit Fees |
|---|---|---|---|---|---|
| So Energy (Aspen Two Year) | 19.42p/kWh | 12:30am – 7:30am | Fixed | Yes | £75 |
| Octopus Intelligent | ~7.5p/kWh | Dynamic | Variable | Yes | No |
| Utility Warehouse EV | 7-8.5p/kWh | 12am – 5am | Variable | Yes | No |
| EDF GoElectric Overnight | 9p/kWh | 12am – 5am | Fixed | Yes | £75 |
| Ovo Charge Anytime | 7p/kWh | 24/7 (with compatible charger) | Variable | Yes | No |
The Final Word on So Energys EV Tariff
So Energy’s EV tariff is expensive but good if you want 100% renewable energy. The longer off-peak period is a standout feature. However, the off-peak rates are nowhere near the cheapest EV tariffs availible, meaning cost-conscious EV drivers may find better deals elsewhere.
John is the Editor and Spokesperson for Electric Car Guide.
With over 20 years of writing experience, he has written for titles such as City AM, FE News and NerdWallet.com, covering various automotive and personal finance topics.
John’s market commentary has been covered by the likes of The Express, The Independent, Yahoo Finance and The Evening Standard.
