The best kind of energy

Bulb is the UK's biggest green energy supplier. We provide all our members with 100% renewable electricity. For every unit you use, we make sure a unit is produced and put on the grid by a renewable source including solar, wind and hydro. Plus, our gas is 100% carbon neutral. 10% is green gas produced from renewable sources like food or farm waste. And we offset the rest of the gas we supply by supporting carbon reduction projects around the world.

A birds eye view of Old walls farm, one of our renewable electricity generators
A photo of Miles and Gale, the owners of Old Walls Farm, one of our renewable electricity generator.

Independent generators

We buy our energy from independent renewable generators from across the UK. Wherever possible, we have direct relationships with these generators to purchase their output. To cover any shortfalls, we purchase renewable energy on the wholesale market.

We think it's really important that you know where your energy comes from. From hydroelectricity to anaerobic digestion, our generators are an innovative bunch.

Greening up the grid

By being with Bulb, all our members are helping to protect the planet. Every year, the average Bulb home saves 3.5 tonnes of CO2 from entering the atmosphere. That's like planting 1,770 trees.

And for every switch to Bulb, we donate £1 to Edible Playgrounds by Trees for Cities, a charity transforming areas in inner-city schools into vibrant outdoor spaces that teach children about growing and eating healthy food.


Every unit of renewable electricity or gas that we purchase is accredited. This means we can verify the amount of renewable energy we supply. For electricity, this is run by the regulator Ofgem. Every year, like all suppliers, we report on the amount of electricity we've purchased from what source: coal, gas, nuclear and renewables. For Bulb, it's simple: 100% of our electricity comes from renewable sources. We report to the green gas industry too, who verify that 10% of our gas is from renewable sources. Our carbon offset projects are all verified by the Gold Standard , the Verified Carbon Standard, or the UNFCCC's Clean Development Mechanism.

Selling your power

Interested in selling your power? We offer transparent, simple and competitively priced Power Purchase Agreements (PPAs) to generators with an installed capacity greater than 100kW.

Email or call us on 0300 30 30 635