Bulb Energy offers just one tariff, with 100% renewable electricity and carbon neutral gas. Bulb was set up in 2015 to ‘make energy simpler, cheaper and greener’.
It says that 10% of its gas is produced from renewable sources, while the remainder is offset by Bulb supporting carbon reduction projects around the world.
Bulb's variable tariff is usually among the cheaper deals available in England, Scotland and Wales. It doesn’t charge exit fees, and says it will refund you if your old supplier charges you exit fees to leave and join Bulb.
Bulb Energy says it keeps prices low by investing in technology to reduce costs.
It has grown quickly and now has more than a million customers. In March 2020, it took on 9,000 customers from Gnergy when the smaller firm stopped trading. Homes with prepayment meters can now join Bulb.
Bulb customer score
Bulb Energy came joint-third out of 35 energy companies rated by 7,355 members of the public in the annual Which? customer survey – the broadest, most independent, view of energy companies out there.
Bulb score breakdown
The graphic below shows the breakdown of its score in our latest survey.
Scroll down to read our verdict on Bulb, plus what customers think about different aspects of its service.
Which? verdict on Bulb
Bulb has gained customers quickly since its launch a couple of years ago. Indeed, half of its customers in our survey said they switched to it in the past year. In contrast, just 10% of British Gas customers in our survey joined it in the last year.
Its rapid growth hasn't affected Bulb's ability to keep its customers happy, as shown by its consistently high ranking in our survey over the three years it's been included.
This year, Bulb only missed out on the top spot by five percentage points. Customers were most impressed by its complaints handling and the accuracy of its bills, both of which received five-star ratings. Bulb was one of only two firms to get the highest, five-star rating for resolving complaints. The other was .
Customer feedback shows that Bulb does a good job on creating clear bills, its customer service, digital tools and value for money.
Bulb also has one of the lowest levels of complaints among companies included in the survey, and resolved almost all the complaints it received in the first six months of last year within eight weeks.
While that may not sound terribly speedy, the worst companies resolved less than 80% in the same time period.
However, it was the second-slowest to answer the phone, on average, in our snapshot investigation into . In previous years it was much faster. This year it took 19mins 2secs, on average, to pick up. Only Scottish Power was slower, taking 21mins 24secs, on average.
We also tried its live chat in the hope that this would get us a faster response. Unfortunately, Bulb’s live chat was unavailable on 11 of the 12 occasions we tried. On the only occasion it worked, it took us 10 minutes to get a reply. Bulb wasn’t the only company with poor live chat availability, though – Utilita also only had live chat available on one occasion of our attempts.
Pros: Customers rate it excellent for handling complaints and accurate billing
Cons: Slow to respond on the phone in our snapshot investigation, live chat often unavailable
Bulb electricity sources
Bulb Energy says 10% of its gas is ‘green’. This gas comes from biomethane produced from organic matter such as sewage and manure. The rest is carbon offset.