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Save up to £220* on our competitive green tariffs plus a £50 donation to Sustrans and a free boiler service (usually £84)!

We are proud to be the energy partner for Sustrans, helping people switch to green energy that leads to cleaner air - and better overall health - for everyone. Not only that, but we’re donating £50 to Sustrans for each and every person who switches their energy supply to us. Either start your quote below or give us a ring and mention Sustrans.

Sustrans people on bikes

A journey towards clean air: sign up to our renewable energy and help save the planet.

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Sustrans is the charity making it easier for people to walk and cycle. They are custodians of the National Cycle Network. A UK-wide network of signed paths and routes for walking, cycling and exploring outdoors. It connects people and places across the UK and provides traffic-free spaces for everyone to enjoy.

Sustrans logo

Sustrans works with volunteers, partners, and supporters to care for the National Cycle Network and encourage active travel choices (walking, cycling and scooting) for the school run and commute. They work with local authorities, policy-makers and communities to make walking and cycling a more attractive choice and to create healthier places that benefit us all.

* Savings are compared to standard variable tariffs offered by Big Six Energy Suppliers for an average customer as defined by Ofgem. £25 donation per fuel when the supply goes live

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FREE Boiler service with the Gas Boiler Service Plan through HomeServe

Having a reliable boiler to bring heating and hot water to your home is a daily essential. But just like a typical car service, you need to get it checked regularly to make sure it's working properly. That's why Tonik have teamed up with HomeServe, one of the UK's leading home assistance providers, to offer a Gas Boiler Service plan through HomeServe completely FREE in the first year (usually £84) for renewing customers. A HomeServe approved Gas safe® registered engineer will conduct a service on your boiler free of charge. They will also offer advice and tips on using your heating more efficiently. Having your boiler serviced regularly may reduce the risk of a breakdown and may also help to prolong its life.

Please note:

Owing to the Covid-19 pandemic HomeServe need to prioritise emergencies and put their most vulnerable customers first, but don't worry your first Gas Boiler Service will still take place after 6 months of your plan start date.

Offer Terms & Conditions

Gas Boiler Service Plan Terms & Conditions

Here’s how it pays to join Tonik...

When you switch your energy supply to Tonik, our award-winning customer service and sustainably priced green energy come as standard, but there’s more – we reward our members for each step they take to help rid our skies of dirty, fossil fuel emissions.

Switch to green energy with us and we'll donate £50 as thanks!

Refer your friends. You get £25 off your bill. They get £25 too.

Get a free gas boiler service through HomeServe usually £84

Switch to green energy in just two minutes


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Choose your renewable energy tariff and then we'll take a few quick details.


Leave the rest to us

Sit back. Relax. Feel good about the good you've done for the planet.

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