our tariff options

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Our Tariff Options

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So Fixed

All our fixed-rate tariffs come with 100% renewable electricity. Unit rates and standing charges stay the same for the length of your 12 or 24 month contract.

So Flex

This is our standard variable tariff, which means your unit rates and standing charges change every 3 months, in line with Ofgem’s price cap.

So Green Tracker

100% renewable electricity, and your rates and standing charges update in line with Ofgem's price cap every 3 months.

So EV

Our EV tariff works for any EV and charger. It offers you an overnight charging rate of 6.5p per kWh. All you need is a smart meter sending half-hourly reads.

So Unique

Our innovative smart tariff analyses your smart meter data and gives you personalised peak and off-peak rates. You could save up to £200* a year vs So Flex.

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Fixed vs Variable

Understanding the difference between our tariffs
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Fixed Tariff

Unit rates and standing charges stay the same for the length of your contract. They aren't affected by Ofgem price cap changes.

Choose Fixed Tariff

Variable and Tracker tariffs

Unit rates and standing charges can change every 3 months, in line with the Ofgem price cap.

Choose Variable Tariff

Why choose a fixed tariff?

  • Our fixed tariffs are 100% renewable, meaning you’re doing your bit for the planet and lowering your carbon footprint.
  • You can enjoy stable prices and avoid having to shop around in changing markets.
  • Choose between 12 months or 24 months for fixed-rate security.
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Why choose a variable tariff?

  • Some customers prefer not being tied into a contract.
  • There could be lower prices at different points in the market. Being on a standard variable tariff means you can explore these options.
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Frequently Asked Questions

Can I negotiate a deal with my energy supplier?

Are there any fees or penalties for switching tariffs?

How often should I review and compare energy tariffs?

Which is better, a Variable or Fixed tariff?

*The £200 saving claim is based on over 200 trial samples modelled against our So Flex Standard Variable Rate on 29 September 2025. Your actual savings will depend on how much energy you shift, and whether you shift to Off-peak or Super Off-peak times.