New EnviTec combined gas upgrading and bio-CNG compressing plant in Estonia

28 June 2021

The construction and successful commissioning of two gas upgrading plants in Tartu and Vinni has now been followed by the third EnviTec plant in Estonia. The new plant in Oisu was completed in six months from signature to handover.

Lars von Lehmden, Managing Director of EnviTec , a company based in Germany: “Our customer here was again AS EG Ehitus, a subsidiary of gas network provider AS Elenger, who had previously commissioned us to build the two plants in Tartu and Vinni.” The combined gas upgrading (capacity 427 Nm3/h) and CNG (compressed natural gas) compressing plant runs on raw gas from wet manure and feed waste. Although the first two plants feed the biomethane produced into the existing gas grid, Oisu will be using tank trailers. With a total of three filling points for these swap-body trailers, the biomethane will be transported to urban filling stations without the need for a gas grid.

Read more: Germany: LIQVIS and EnviTec Biogas sign agreement for the supply of bio-LNG

The three plants completed by EnviTec Biogas could support the transition of Estonia’s local public transport network. All in all, the EnviThan plants supply 8.2 million kg of CNG each year, “which could, depending on journey type and bus size, power 400 vehicles for about 20 million km,” says Stefan Laumann – while also saving some 26,000 tonnes of polluting CO2 in comparison to Euro VI diesel buses.

According to a recent press release from Tallinn-based public transport company Aktsiaselts Tallinna Linnatransport (TLT), 100 CNG buses are already serving Estonia’s capital, with the acquisition of another 100 buses planned for this year. The city has also invited bids to supply up to 150 methane-powered buses. By 2025, the city aims to have replaced all of its existing diesel buses with environmentally friendly alternatives such as CNG buses.


Author: KS / Source: EnviTec / Photo: Unsplash