The average customer will see a 2.8% increase on their gas and electricity bill, rising from £855 to £879 a year.
It will apply to all of Bulb’s 300,000 customers on the single Vari-Fair tariff and will come into effect on 28th April 2018.
Co-founder Hayden Wood said: “When wholesale energy costs move, so does our tariff. These costs have been rising and are now around 11% higher than they were in July of last year. As a result, from April, our price will be going up by £2 per month for the typical Bulb member.”
Customers can leave at any time with no exit fees.