
Gas Purification Plant
The proposals to transform operations at Cotesbach include a new gas purification plant which would capture the gas produced by decomposing waste and convert it into green energy. This landfill gas, which would otherwise be wasted or flared, will be transformed into biomethane—a renewable equivalent of natural gas. This clean, green gas can then be used to heat homes and power businesses across the country via the national gas network, a connection to which already runs through the Cotesbach site.
The project is a collaboration between Waga Energy, who provide the technology, and Tarmac, the site owners.
Turning landfill by-products into green energy
How It Works: The WAGABOX®
The core of the project is an innovative piece of equipment called the WAGABOX®. Think of it as a sophisticated refinery for landfill gas.
- Capture: Raw landfill gas, a mix of methane, carbon dioxide, and other impurities, is collected directly from the site.
- Purification: The gas is fed into the WAGABOX® unit, which uses a patented two-step process of membrane filtration and cryogenic (deep cold) distillation to separate the useful methane from the other components.
- Result: The output is biomethane that is over 98 per cent pure, making it identical in quality to the natural gas already in the grid. This process is highly efficient, recovering over 90 per cent of the energy from the landfill gas.
What Will Be Built?
To make this happen, a new facility will be constructed on the landfill site. The key components include:
The WAGABOX® Unit: The main purification plant.
Connection Equipment: This includes compressors to increase the gas pressure so it can enter the high-pressure national grid, as well as metering and quality control equipment.
An Underground Pipeline: A new, buried pipeline, approximately 1.4 kilometres (just under a mile) long, will be installed to transport the finished biomethane from the landfill site to the existing National Transmission System (NTS) pipeline located near Rugby Road. This is considered the most efficient and cost-effective route.



