So Green Tracker tracks the energy market, but always stays £50 below the Ofgem price cap.¹ ²
Your rates change every three months, so when prices fall, yours do too.
You get 100% renewable electricity, a 12-month contract,³ and the peace of mind that comes with knowing you're always £50 under the cap.
You'll need a smart meter to keep your prices accurate. Don't have one? We'll install it for free.

| Feature | Green Tracker Tariff | Fixed Tariff | Variable Tariff |
|---|---|---|---|
| Rate stability (per kWh) | The unit price changes with the price cap every 3 months, but stays £50 lower | The unit price doesn't change for the length of your contract | The unit price changes in line with the price cap every 3 months |
| Early exit fees (if you leave the contract before it ends) | Early exit fees of £50 per fuel | Early exit fees of £75 per fuel for 12-month contract, and £95 per fuel for 18 and 24-month contracts | No contract, so no early exit fees |
| Contract length | 12-month contract | Choose from 12, 18 or 24-month contracts | No contract |
| Sustainability | 100% renewable electricity | 100% renewable electricity | A mix of renewable and non-renewable electricity |
| Who it suits best | Customers who want flexible rates that are guaranteed to stay £50 below the price cap, and renewable electricity | Customers who want price stability, protection from market price rises and prefer renewable electricity | Customers who don't want a contract, and prefer flexibility |

Our So Green Tracker's unit rates change when the the price cap changes, every three months. But it always stays £50 under the price cap (£25 per fuel).
If the Ofgem price cap goes up or down, your rates will change with it. We'll always write to you with your new rates at least 30 days before your rates change.
If you'd prefer more certainty over what you pay, a fixed tariff keeps your unit rates the same for the length of your contract. The price cap doesn't affect a fixed rate tariff.
Yes, a smart meter is needed to go on So Green Tracker.
Because your rates change every three months, we need accurate, up-to-date readings to make sure your bills are right. A smart meter sends these to us automatically, so you don't have to do a thing.
If you don't have one yet, we'll arrange to get one fitted before moving you onto the tariff.
This depends on what's happening in the energy market - and what matters most to you.
So Green Tracker moves with the Ofgem price cap every three months. If energy prices drop, so does your bill. But if they rise, you'll pay more.
A fixed tariff keeps your unit rates the same for the length of your contract. You won't benefit if prices fall, but you're protected if they go up.
Our tracker tariff follows the Ofgem price cap, not wholesale prices directly. So your rates change every three months in line with the price cap, not every time the wholesale market moves.
If the price cap goes up, so will your rates. But if it drops, your rates will too.
Whenever the price cap changes, we'll write to you with your new rates at least 30 days before your rates change, so you're never caught off guard.
You can also check your rates at any time in your online account or in the So Energy app.
Yes, wholesale energy prices change every day, sometimes several times a day. They're affected by things like the weather, global events, and how much energy is being generated and used across the country.
That's why some tracker tariffs can feel unpredictable. With So Green Tracker, your rates only change every three months in line with the Ofgem price cap, rather than every day.