Small energy companies
By Sarah Ingrams
Article 11 of 20
iSupplyEnergy began to sell energy to domestic customers in August 2012. It claims to be the cheapest supplier in many parts of the UK.
iSupplyEnergy is based in Bournemouth, Dorset. Its tariffs have a simple structure and prices are made up of a fixed unit rate and a daily standing charge. You can only switch to iSupplyEnergy online.
Previously a British-owned supplier, iSupply was bought by European gas and electricity giant Vattenfall in June 2017.
Initially, iSupply only offered electricity tariffs. It began supplying gas as well from December 2015. iSupply doesn’t offer a green tariff.
You can find out how iSupplyEnergy's prices compare with your current deal by finding the cheapest gas and electricity with Which? Switch now.
iSupplyEnergy customer satisfaction
iSupplyEnergy comes joint eighth out of 23 energy companies rated by 8,917 members of the public in the annual Which? customer survey – the biggest of its kind.
The table below shows the breakdown of iSupply's score from our latest survey.
|iSupplyEnergy survey results|
|Area of performance||Star rating|
|Customer service and complaints handling|
|Value for money|
|Bills (accuracy and clarity)|
|Helping you to save energy|
(Survey: October 2016, responses of 41 iSupplyEnergy customers.)
Find out how iSupplyEnergy compares with other energy companies – we reveal the full results of the best and worst energy companies.
Which? verdict on iSupplyEnergy
iSupplyEnergy has competitive rates. Customers seemed largely happy with customer service, with one commenting that 'iSupply is easy to contact by email and answers quickly.' Another described its customer service team as 'friendly and polite.'
But if you phone iSupplyEnergy, you could be waiting nearly six minutes to speak to a member of its customer services team, our snapshot investigation found in October 2016. It's not the slowest to answer – one firm took more than 14 minutes on average – but the fastest takes just 21 seconds. You can only switch to iSupplyEnergy online; it told us it doesn't take sales calls.
Customers seemed largely happy with customer service.
Pros: It offers competitive electricity and gas tariffs
Cons: A few customers felt it could be better for helping them save energy
iSupplyEnergy fuel mix
Where iSupplyEnergy gets it fuel:
- 17% Coal
- 32% Natural Gas
- 24% Nuclear
- 3% Other
- 24% Renewables
(Note: This information was correct January 2017.)
Fed up with high bills and slack customer service? Use Which? Switch to find the cheapest gas and electricity.