World’s biggest CO2 removal plant switched on in Iceland

Developed by Swiss company Climeworks the new plant - named Orca - is powered by renewable energy from ON Power’s Hellisheiði Geothermal Power Plant.

According to its developer it will capture upto 4000 tons of CO₂ every year, which will then be trapped in stone using a natural mineralisation process developed by project partner Carbfix.

The process works by using giant fans to draw air into the collectors. This is passed over a highly selective filter material that capture the carbon dioxide.  Once the filter material is full the collector is closed and the temperature increased to between 80 and 100 °C. At this point the carbon dioxide is released from the filter, mixed with water and pumped deep underground where the carbon dioxide reacts with the basalt rock and turns into stone within a few years.

Constructed in under 15 months, the Orca plant is based on a modular system formed of stackable container-size collector units making it relatively easy to build similar systems at other sites and to scale it up. Orca consists of eight such collector containers, with an annual capture capacity of 500 tons each. In a statement, Climeworks said it is targeting megaton removal capacity by the end of the decade.