Octopus Super Green Tariff This fixed tariff is the very greenest you can be with Octopus with a fully carbon neutral energy plan! All Octopus electricity tariffs are 100% renewable as standard - (read about where our energy comes from here), plus, on Super Green, any gas you use is fully carbon offset through our partner Renewable World who we work with to choose Gold Standard Verified projects - learn more here. Carbon emission data is calculated using BEIS 2020 emission factors. Supergreen Octopus has no exit fees.