Meet an Unreasonable Venture

Celtic Renewables

Repurposing organic waste into high value sustainable products and biofuel at scale

Mark Simmers

CEO at Celtic Renewables

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celtic-renewables.com

Employees 21–50

Headquarters Edinburgh, Scotland, United Kingdom

Celtic Renewables is commercialising a patented clean technology, developed and owned by the company, which converts low value materials into high value solvents using an innovative adaptation of a proven industrial process – ABE (Acetone, Butanol and Ethanol) Fermentation. The company's mission is to be the world leader in ABE fermentation as a global sustainable industry.

The annual global demand for these bio-based solvents (which displace fossil-fuel equivalents) is millions of tonnes, and the uses of these solvents touch almost every aspect of everyday life, in sectors such as personal care, cosmetics, food and industrial manufacturing.

Globally there are billions of tonnes of low-value biological materials which are suitable for the Celtic Renewables process, giving the potential to completely displace fossil fuel equivalents in the future - a global imperative.

Energy & Environment

Notable Achievements

Raised over £65m of early-stage funding
Developed a first-of-a-kind manufacturing plant in Scotland
Attracted global media coverage for its compelling value proposition

Currently Operating in Four Regions

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Press Mentions

December 12, 2025

Plans advance for Grangemouth green chemicals hub

Celtic Renewables is poised to play a pivotal role in developing a green chemicals hub at Grangemouth, bolstered by a significant funding package. This initiative will foster job creation and drive...

December 11, 2025

£6.23 million funding package will support new biorefinery in Grangemouth | Envirotec

Celtic Renewables has successfully secured £6.23 million in funding to establish a new biorefinery in Grangemouth. This initiative aims to produce sustainable chemicals, reinforcing the company's...

Read on Envirotec »

November 27, 2025

Milestone for Celtic Renewables' plans to build large-scale biorefinery in Grangemouth | Project Scotland

Celtic Renewables is advancing plans for a large-scale biorefinery in Grangemouth, reflecting its commitment to sustainable energy. The recent appointments enhance strategic development,...

Read on Project Scotland »

November 25, 2025

Celtic Renewables plans new large-scale biorefinery in Grangemouth

Celtic Renewables plans to establish a large-scale biorefinery in Grangemouth, significantly advancing sustainable biofuel production. This initiative aims to convert agricultural waste into...

Read on Biofuels International »

October 8, 2025

Green chemicals firm in Grangemouth offers thoughts on demand trends | Envirotec

Celtic Renewables, a pioneering green chemicals company in Grangemouth, highlights rising demand for sustainable products. Their innovative processes contribute significantly to reducing...

Read on Envirotec »

August 7, 2025

Celtic Renewables bolsters leadership team with CCO and CFO appointments

Celtic Renewables has strengthened its leadership by appointing a Chief Commercial Officer and Chief Financial Officer, enhancing its commitment to sustainable biofuel production. These strategic...

Read on The Manufacturer »