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/Our green energy/Green gas

Our green energy

We don’t just supply green energy, we make it too
Our green energy

Green gas

Ecotricity began with a mission to replace electricity made by burning fossil fuels with green energy. We succeeded and now we aim to replace fossil fuel natural gas with sustainable green gas.

So, we’ve started building green gas mills and our first one will be up and running soon.

Explore our green gas mills
How is green gas made?

Unlike other forms of green gas which often use animal waste, ours is made ethically and sustainably from grass cuttings. The grass is broken down by anaerobic digestion in vats, producing biomethane. This is then captured and fed into the grid.

How does low carbon gas work?

When the gas burns, carbon will go into the atmosphere, but it will be reabsorbed when the grass grows back creating a sustainable natural cycle. We estimate that if we grow grass on all the marginal land in Britain, we’ll be able to make enough green gas to supply the entire country.

Can we power Britain with green gas?

Yes. Our 2022 report on powering Britain using green gas mills shows exactly how we can do it without taking away land for food production.

As the report demonstrates, we can power both homes and businesses with green gas – and it’s much cheaper and faster than making everyone convert to heat pumps.

Dog-eared document iconGreen Gas Mills Report 2022 (PDF, 14.3 Mb)
Green gas facts

To find out more about how green gas works read our Green Gas Factsheet and our report on Feeding a Green Gas Mill.

Carbon neutralised green gas

Currently, about 1% of the gas we supply comes from other green gas mills, and the rest is natural gas. The residual carbon emissions from our fossil fuel gas are offset by investing in carbon reduction schemes around the world to carbon neutralise all the gas we supply.

Carbon offsetting isn’t ideal – we see it as an interim solution until we can ramp up production of our sustainable green gas.

Carbon reduction projects

The carbon reduction projects we support have a range of environmental and community benefits. They include:

Soubre Hydropower Plant, Ivory Coast.

Our green gas mills

Find out more about the low carbon green gas mills we're building with the aim of transforming Britain's gas grid for good...

Reading, Berkshire

The construction of our first green gas mill in Reading has now begun. Locally harvested grass and straw will be broken down through a process of anaerobic digestion, producing sustainable biomethane. This will be supplied to the UK’s gas grid and then on to Ecotricity gas customers.

Current plans are for the mill at Reading to produce enough green gas to supply 4,000 homes*, saving up to 4,000 tonnes of carbon dioxide annually**.

*Based on OFGEM medium household consumption for 2020.
**Estimated likely carbon saving based on plant operating parameters of 82g per kWh saved compared to fossil fuel natural gas.

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Climate Clock

The Climate Clock is a version of the Doomsday clock that has been running since 1947 - this tracks the risk of global man-made disaster, through man made technology (like nuclear weapons) - displaying the minutes and seconds left before midnight, when disaster strikes. The climate crisis is a small part of the calculations made.
The climate clock uses a similar approach, but, focuses only on the climate crisis - which is the biggest and most urgent existential threat we face.
"The Climate Clock is a countdown to the biggest man-made disaster we face - but also a measure by which we can track our progress - moving from fossil to renewable energy. It shows we have no time to lose - the clock is ticking…" Dale Vince, OBE.
Ecotricity is a sponsor of the Glasgow Climate Clock that will run every night until COP26.