The objective of the DAC-Battery project is to develop and demonstrate an integrated system that captures atmospheric CO2 while simultaneously providing grid-balancing services through hydrogen production, storage, and consumption. The project hypothesizes that by combining a novel, passive, membrane-assisted direct air capture (DAC) system with a reversible alkaline fuel cell/electrolyzer (termed the H-Battery), it is possible to significantly reduce the levelized cost of CO2 capture to USD 250/ton – well below current DAC cost. This dual-functional system is expected to close the price gap between sellers and buyer in carbon credit markets, enabling large-scale deployment of DAC.
The approach of the DAC-Battery project involves the development and integration of two core innovations: a passive, membrane-based DAC unit and H-Battery. The DAC unit will be scaled from a TRL3 prototype to a TRL5 pilot system. The H-Battery will be scaled from TRL2 to a 2 kW TRL4 stack capable of switching between electrolysis mode – regenerating the DAC sorbent and producing hydrogen – and fuel cell mode – generating electricity from stored hydrogen. These components will be integrated and tested for compatibility, performance, and durability, with system-level modelling conducted using EnergyPRO to simulate real-world operation under Danish energy market conditions. The project also includes techno-economic analysis, policy evaluation, and stakeholder engagement to ensure market readiness and alignment with national climate goals.
The DAC-Battery project is expected to deliver a TRL5 prototype that integrates CO2 capture with hydrogen-based energy storage, targeting a CO2 capture cost of USD 250/ton. It will enable flexible grid services, support renewable energy integration, and contribute to Denmarks 2045 climate neutrality goals. The system offers a scalable, economically viable solution for carbon removal and energy storage, with strong commercialization and job creation potential.
