To be clear, no matter fuel portfolio of the plan you choose, your electricity’s make-up will be identical to your neighbors’. Depending on where you live, that could a mix of renewable and fossil fuels. Certificates offset your electricity use by putting an equal amount of clean energy into the electricity grid. If a plan is 100% renewable, that means it’s 100% offset with certificates.
While there is a very strong argument for providing cheap, subsidized power for the poorest in society, this should be done in a way that limits subsidies to the really deserving and the system as a whole needs to be able to charge tariffs that on average cover all costs. If this doesn’t happen then all manner of bad things will follow. As you might guess prices have been set too low by African governments. These subsidies have also been made too widely available, benefitting the elite and middle classes more than the poor (who, not having good access to the grid in the first place, don’t have ready access to these subsidies).
Switching electricity supplier could shave pounds off your bills. But it’s not always about how much hard cash you could save. You might be fed up with poor customer service, you might want greater visibility of your usage through an app or you might want to choose your supplier based on their green credentials, or whether they supply a smart meter.