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Coupar Angus

Scotland’s first biomethane plant at Coupar Angus was commissioned in December 2014


The Keithick Biogas plant at Coupar Angus, Perth, Scotland was commissioned in December 2014. The plant processes 1200 cubic metres an hour of biogas using water-wash scrubbing technology. Up to 560m³ of biomethane is injected to the grid hourly into Scotland Gas Networks medium pressure network.


Our role:


Our investment in the project includes installation of biomethane assets on site, grid entry unit and export pipeline.



We played a key role in developing the project which comprised undertaking grid capacity planning and design, managing network contracts, producing a fully integrated design, that included safety systems, gas quality risk assessments, civil, mechanical, electrical and instrumentation.



We installed all infrastructure from the AD interface through to the connection to the gas network. Our installation included biogas upgrader, propane tanks, pressure regulators, gas-entry-unit (GEU), 500m pipeline and connection. Our team oversaw the project management through to commissioning and beyond.


Post commissioning

Our engineers were on hand to provide support and expertise through the early stages until the plant was fully operational.


Maintenance and support

We continue to provide a full maintenance package, including routine visits, planned and reactive maintenance and refining plant operation to maximise output. We also provide a liaison role with the network operator SGN.


Green Impact:

More than 18 million cubic metres of biomethane injected to the grid since commissioning. The Keithick Biogas plant produces green gas to supply over Scottish 4,200 homes. This is a carbon equivalent saving of 9,300 tonnes per annum.


Performance improvements:

By working closely with our partners, we have helped to optimise the plant and increase productivity of biomethane from 2.4 million m³ in year one to 4.1 million m³ injected into the grid in 2019.