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Updated: 27 Oct 2021


GEUK says it aims to make renewable energy mainstream. Find out what customers think of its service and pricing, plus whether it’s the best gas and electricity company for you.
Jade Harding

GEUK sources all of its electricity and gas from green and renewable sources. It’s one of three firms we’ve named Eco Providers for energy companies in 2021.

It recently rebranded, and was previously called Green Energy UK.

Its 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.

Compare gas and electricity prices using Which? Switch to see if you could save money with GEUK.

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.

Good service and accurate bills

Green Energy UK customer

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.

Find out how Green Energy UK compares with other energy firms in our guide to the best and worst energy companies.

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. It is also one of three energy companies we have named Eco Providers for energy in 2021.

Customers gave it an impressive four out of five star rating for its billing accuracy. Only seven companies received the full five star rating, including the best energy firm in our survey (Outfox the Market). 

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. 

My bills are easy to understand

Green Energy UK customer

Even though GEUK says it aims to offer customers competitive prices, customers only classed it as ‘fair’ on value for money. This could be better. Seven other companies got a higher rating (four stars or above) for this area.

It's not as cheap as I initially thought

Green Energy UK customer

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.

Check our guide to prepayment meters to find a supplier which does, and how customers rated it in our latest survey.

Does GEUK sell renewable energy?

GEUK sells 100% renewable electricity which it buys directly from renewable generators. It’s the only energy provider to sell 100% green gas.

It’s one of three firms we’ve named Eco Providers for energy companies in 2021This means it ranked in the top three when we rated the UK's energy providers on a range of sustainability credentials relating to renewable energy.

Proportion of renewable electricity sold to domestic customers
Generates renewable electricity?
Buys renewable electricity directly from generators?
Proportion of customers’ renewable electricity matched by REGO certificates?
Generates or buys directly from fossil fuels?
Sells green gas?
100%NoYes (100%)100%NoYes (100%)

Proportion of renewable electricity according to GEUK’s 2020/21 fuel mix. Other responses based on information provided by suppliers in August and September 2021.

GEUK told us that it works with a network of independent and commercial generators to generate its customers’ energy. It doesn’t own any renewable generators itself.

It buys enough green gas to match 100% of its customers’ gas use. 

Its EKO Energy tariff avoids electricity generated where there are migrating birds and fish.

Find out more about the differences between energy companies’ renewable electricity.

Want to find out which energy firm is the cheapest for you? Use Which? Switch to compare gas and electricity prices.