Climate finance platform Senken has announced the largest biomass storage deal signed in Europe to date, securing a multi-year carbon removal offtake agreement with Berlin-based project developer Carbonsate. The contract covers the delivery of 50,000 tonnes of permanent carbon removal between 2026 and 2028.
Deliveries under the agreement are scheduled to begin this year. The contract represents the second-largest buyer commitment globally in the biomass geological storage category, and the largest for a project operating in Africa. To put the scale into perspective, with cumulative global deliveries of permanent carbon removal currently standing at approximately 1.5 million tonnes, this single transaction represents roughly 4 per cent of that total.
Under the project model, biomass storage—often referred to as biomass burial—locks carbon away by sealing waste wood inside engineered underground chambers. Deprived of conditions that allow burning or decomposition, the wood retains its carbon content for centuries. Because the process avoids energy-intensive capture mechanisms, it offers permanent storage at a significantly lower cost than direct air capture technologies.
Highlighting the supply-side constraints facing the market, Adrian Wons, CEO of Senken, stated that demand for permanent carbon removal was already outrunning supply, noting that corporate net-zero targets all pointed to the same small pool of verified capacity. He explained that this gap would define the market for the next decade, adding that Senken had committed for multiple years to secure access for European buyers to credible removal at predictable prices.
Johanna Broell, Co-founder and CEO of Carbonsate, emphasised the operational impact of the agreement, explaining that long-term commitments gave project developers the certainty required to build ahead of demand. She noted that the agreement supported the expansion of their storage sites in Namibia while bringing meaningful new supply of verified, high-integrity carbon removal to the market.
