Technology – header

Electrochaea employs a patented biocatalyst to convert low-cost and stranded
electricity and carbon dioxide into pipeline-grade renewable gas.

How the technology works

Electrochaea employs a patented biocatalyst to convert low-cost and stranded electricity and carbon dioxide into pipeline-grade renewable gas. This gas can be directly injected into the existing natural gas grid. The core of our power-to-gas technology is this proprietary biocatalyst that can be deployed in a simple and cost-effective energy conversion system.


Biocatalyst (BioCat)

Electrochaea’s proprietary biocatalyst is a selectively evolved – not genetically modified – strain of methanogenic archaea, a single-celled microorganism that has populated Earth for billions of years. These organisms can be found in a broad range of habitats, including some of the most extreme environments on the planet such as volcanic hot springs, salt likes, in addition to that, oceans and soils among others. The strain of archaea used in our power-to-gas process has been adapted for industrial application by Prof. Laurens Mets at the University of Chicago.


Our archaea exhibit several unique properties including high mass conversion efficiency, tolerance to many contaminants typically found in industrial CO2-sources (oxygen, hydrogen sulfide, particulates), high selectivity in methane production, and very fast reaction kinetics, that enable scale up to commercial application. In addition, the organisms are self-replicating and self maintaining and hence do not require periodic replacement.


System Design

Electrochaea is currently pursuing energy storage via a two-step power-to-gas system that uses an off-the-shelf electrolyzer to produce hydrogen. This hydrogen is then fed to a separate bioreactor containing the archaea along with carbon dioxide from a biogenic or industrial source.

The organisms are indifferent as to the source of CO2 and can use commonly available sources such as raw biogas from anaerobic digesters, fermentation off-gas from breweries and ethanol plants, and flue gas from combustion processes.


Because of the high selectivity of the archaeas, minimal post-reaction gas treatment is needed before the product gas is injected into the gas grid. Oxygen and heat are by-products from the process and can be sold in a broad range of different markets, either on-site or off-site.

Development activities


Foulum Project (pre-commercial), Denmark

With a grant of $1.2 million from the Danish Energy Agency (EUDP), we tested our power-to-gas technology in using a 10,000-liter reactor vessel and raw biogas as a carbon dioxide source. The system ran continuously for more than 3,200 hours between August and December 2013 at Aarhus University’s Biogas Research Center in Foulum, Denmark. Supported by Aarhus University, E.ON, Energie 360° (formerly Erdgas Zürich), ewz (the City of Zurich’s utility), and NEAS Energy, the project demonstrated the efficiency, productivity, robustness, and responsiveness of Electrochaea’s power-to-gas technology.

Development activities


BioCat Project (commercial scale), Denmark

Electrochaea’s BioCat project demonstrates commercial scale power-to-gas technology to address Europe’s needs to integrate renewable power, gas and energy storage. The overall objective of the project is to design, engineer, and construct a commercial-scale power-to-gas facility and show its capabilities to provide energy storage services to the Danish energy system.


The core of the BioCat project is Electrochaea’s BioCat methanation system, which employs a unique biological catalyst that stores renewable energy in methane. The system includes a commercial scale methanation reactor and balance of plant, an electrolyzer, gas polishing system and gas grid injection station, all located at the BIOFOS waste water treatment facility in Avedøre, near Copenhagen. The system draws renewable electricity during times of low demand and converts that electricity to renewable gas for direct injection into – and storage in – a nearby gas distribution grid.


Biogas is being produced on-site at Avedøre via anaerobic digestion and delivers the carbon dioxide required for methanation. Heat and oxygen, which are generated as by-products in the power-to-gas process, are being captured and utilized in the BIOFOS on-site operations. The system has flexible operational modes and responds rapidly to available energy, so it can also provide frequency regulation services to the Danish power grid while injecting renewable natural gas into Copenhagen’s energy gas grid.


The BioCat plant has operated for more than 3,000 hours as of January 2018. The goals for current operations are to achieve full system automation and refine the BioCat techno-economic model for profitable operation in the current Danish energy environment.



Furthermore, Electrochaea maintains and operates the plant as a demonstration site, which is open for potential customer, partners and visitors to the BIOFOS Avedøre Biogas-park which was officially inaugurated on December 8th, 2017 by the Danish Minister for Energy, Utilities and Climate, Lars Christian Lilleholt.


If you are interested in visiting the site, please contact Electrochaea for more information on



Within the scope of these projects for the storage of gas, liquid fuels and electricity Electrochaea provides the proprietary system design and engineering, and oversees the construction and design of structures for the storage of gas, liquid fuels and electricity. Our services include project management and system commissioning.