Green gas is only produced in limited quantities. As it's currently delivered on a much smaller scale, green gas is more expensive than standard fossil-fuel gas. If you are on our Greenest tariff, we offset the remaining 90% of fossil fuel gas by investing in a number of carbon offset projects. This means that members on our Greenest tariff have a totally carbon-neutral energy supply.
Read more about our Carbon offset project: https://www.tonikenergy.com/positively-greenest/