GEUK sources all of its electricity and gas from green and renewable sources. It recently rebranded and was previously called Green Energy UK.
Electricity comes from hydropower, solar panels, wind and biomass. It buys directly from generators in the UK. Its gas is 100% ‘green’ gas from anaerobic digestion (where micro-organisms break down organic matter without oxygen to produce methane and biogas).
It says it aims to make renewable energy mainstream and to offer competitive prices.
Established in 2001, it's among the oldest energy firms outside the traditional biggest six and was the first energy supplier to launch a tariff using a smart meter to charge customers different electricity rates depending on the time of day. Called TIDE, it costs less for electricity used overnight and four times more at peak times.
None of GEUK's tariffs have exit fees.
Green Energy UK customer score
Green Energy UK, as it was known when we ran our survey, came joint 12th out of 25 energy companies rated by 7,460 members of the public in the annual Which? energy companies satisfaction survey. Utilita also came 12th.
Customers were most positive about its billing.
GEUK score breakdown
The graphic below shows the breakdown of GEUK's score in our latest survey. Scroll down to read our verdict on this energy firm, and to find out more about its prices.
Which? verdict on GEUK
GEUK, formerly known as Green Energy UK, is included in our energy companies survey results for the first time this year and it kicked off to a reasonable start, scoring 68% and just about ranking in the top half of the table, based on the feedback of its customers.
If you're not a fan of complicated and jargon-filled bills, this firm could be for you. It received a four star rating for clarity, which suggests GEUK sends out clear and concise billing.
Unfortunately we didn't get enough responses to rate GEUK for its customer service and how it deals with complaints.
Pros: It offers 100% renewable energy
Cons: Other energy companies are rated higher for value for money
Can I join GEUK with a prepayment meter?
No, GEUK does not accept customers with prepayment meters.