Our electricity fuel mix

Every year, like all suppliers, we let the regulator, Ofgem, know the amount of electricity we've purchased from what source: coal, gas, nuclear and renewables. Every unit of renewable electricity we purchase is accompanied with a snazzily named Renewable Energy Guarantee of Origin (REGO) certificate. REGOs enable Ofgem to verify the amount of renewable electricity supplied by each supplier.

100% of Bulb's electricity is renewable

Chart shows Bulb's electricity is purely renewable, compared to the UK's average electricity fuel mix which is generated with a combination of renewable (24.2%), natural gas, coal, nuclear and other.

Note: Based on Ofgem supplier submissions for 2016-17
Source: Electricity info, an independent energy information site

10% of Bulb's gas is renewable

Chart shows Bulb uses 10% renewable gas (biomethane) compared to to the UK's average of about 0.5%

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

Our gas fuel mix

Every unit of green gas we purchase is also accompanied with a certificate which confirms its origin. There are two certification schemes. The Renewable Energy Association, the renewables industry body, verifies green gas using the equally snazzily named Renewable Gas Guarantee of Origin certificates (RGGOs). Green Gas Trading Ltd use Biomethane Certificates to do the same. Both types of certificate reliably track the green gas we purchase.

Our generation mix

At Bulb, we have a mix of generation types in our portfolio. This includes hydro, anaerobic digestion, wind and solar.

Calculating impact

We think it's important to help our members understand the environmental impact of choosing a renewable supplier. The average home in the UK produces 0.35156 kg of CO2 per kWh of electricity and 0.18416 kg of CO2 per kWh for gas. We use Ofgem's data on domestic energy consumption to see how much CO2 a typical home produces. A typical home with medium energy usage uses 3,100 KWh of electricity every year and 12,000 kWh of gas. So, the typical home produces 3,299 kgs of CO2 every year. Bulb's electricity produces 0 kg of CO2 per kWh, while our gas produces 0.166kg of CO2 per kWh. So, by being with Bulb, the same home produces only 1,988 kgs of CO2, saving 1,311 kgs (or 1.3 metric tonnes) of CO2 from entering the atmosphere.

At Bulb, we contextualise this impact so it is easy to understand. We do this by communicating the number of trees you'd need to plant to sequester the same amount of carbon. A recent study carried out by Forestry.gov at Kielder Forest found that the Forest's 150 million trees lock up 82,000 tonnes of carbon every year. A rough estimate means each tree at Kielder is locking up 0.546 kg of carbon per year – equivalent to 2kg of carbon dioxide. If one tree sequesters 2kg of dioxide, you would need 655 trees to sequester the same amount of CO2 saved by the typical home with Bulb (1,675 kgs).