The ideal supplier would provide the cheapest tariffs, have the best customer service and supply all their electricity from their own renewable energy generation and / or power purchase agreements (PPAs) with renewables generators.
However, good customer support costs money, and the complexities of matching generation and demand means that supplying entirely from your own generation / PPAs is more expensive.
In finding a supplier to recommend we look for a good balance of price and customer service. Our current recommended supplier is Octopus Energy.
Octopus Energy are the top rated supplier by Which?  and come towards the top with other ratings services.
On price, the market is very volatile, especially for the cheapest tariffs as companies vie to offer the cheapest deals.
This means that the cheapest tariff can change on a weekly basis.
Octopus tariffs tend not to be the very cheapest but are consistently cheaper than the majority of tariffs.
Getting the very cheapest tariff can mean changing supplier on a regular basis and risking poor customer service. Being the cheapest can mean lower margins and an influx of customers that exceeds a companies capacity to scale their support, at least in the short term.
Octopus Energy are a 100% renewables supplier. Some of this is achieved by purchasing REGO certificates from renewable generators who have sold electricity to the wholesale market.
REGO certificates ensure that there is no double counting of renewable supply, but some purists may prefer a supplier which meets its entire supply through its own generation and / or PPAs.
For more information on REGOs and the arguments around REGO trading, see About Green tariffs.
Octopus provide a variety of tariffs, mainly a variable option, and fixed price options for set periods. They also offer some innovative tariffs such as Agile which tracks half-hourly wholesale prices, encouraging customers to shift their electricity use away from the times peak demand, which has the potential to make better use of available renewable supply and reduce the need for fossil fuel supply.
We believe Octopus Energy provide a good balance for someone looking for a 100% renewables tariff from a reliable supplier at an affordable price.
We will review this recommendation regularly to ensure that their customer service remains good and their prices competitive.
If you use the Octopus Energy link on this site to switch to Octopus, you will receive a £50 credit on your Octopus Energy account, and we will also receive £50 from Octopus for the referral.
We used to decline referral fees to demonstrate that our rating of tariffs was not influenced by fees received. However, relying on donations did not provide sufficient income to maintain the site and carry out our assessment of tariffs.
Should we find that our recommended tariff no longer meets our criteria on service and price, we will either change the recommended supplier or remove this switching option.