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Our electricity fuel mix

As you may know, 100% of our electricity comes from renewable sources, and every year we need to let the regulator know where this comes from. Alongside every unit of renewable electricity we purchase is a snazzily named Renewable Energy Guarantee of Origin (REGO) certificate. These certificates allow Ofgem to verify the source of every supplier's electricity.

100% of Bulb's electricity is renewable, compared to 33% national average

Bulb's electricity is purely renewable, compared to the UK's average electricity fuel mix which is generated with a combination of 33% renewable, 41% natural gas, 19% nuclear, 5% coal and 2% other.

Note: Based on Ofgem supplier submissions for 2018-19
Source: Electricity info, an independent energy information site

Generating our electricity

All Bulb members are powered by sun, wind and water. The breakdown looks like this:

73% wind, 24% solar and 3% hydro

We source this energy from renewable generators across the country.

10% of Bulb's gas is renewable, compared to 0.3% national average

Bulb uses 10% biomethane and 90% carbon offset gas, compared to to the UK's average of about 0.3% renewable gas.

Note: Based on Digest of United Kingdom Energy Statistics 2017
Source: Department for Business, Energy & industrial Strategy

Our gas fuel mix

We also receive a certificate for each unit of green gas that we purchase. For the 10% of our gas that comes from renewable sources, we work with two certification schemes. We receive the equally snazzily named Renewable Gas Guarantee of Origin (RGGO) certificates from the Renewable Energy Association and Biomethane Certificates from Green Gas Trading.

Every carbon offset certificate we buy is verified by one of three internationally-recognised standards: the Gold Standard, the Verified Carbon Standard or the UNFCCC's Clean Development Mechanism. These organisations ensure carbon reduction projects have a robust audit trail, and that carbon savings are additional to what would happen anyway and are sustained over time.

Generating our gas

10% of the gas we supply to our members is green gas, or biomethane, which is produced by a process called anaerobic digestion. We work with independent generators who use a variety of feedstocks to produce their renewable gas:

  • Purpose-grown crops: 51.8%
  • Food or farm waste: 47.8%
  • Animal waste: 0.4%

We like to think this gas is as natural as your uncle's after a plate of sprouts. And it's produced pretty much in the same way!