Switching from MgCO 3 to a cheaper, more abundant mineral (e.g., CaCO 3 ) could significantly decrease the cost of this technological solution. The calciner is the second most important cost item in Technology 2A. Heirloom is pursuing an electrically-powered calciner, which is different from the here-used study by McQueen et al. . It is not clear if an electric calciner will reduce the equipment cost but it is expected to have an impact on the net CO 2 removal cost and OPEX.