Table 4 Operating expenditures (OPEX) for the MgO looping process.

From: Ambient weathering of magnesium oxide for CO2 removal from air

OPEXCost [M$]Comments
Lower boundUpper bound
Maintenance3233,835Calculated at 0.03 of total capital7
Labor971,151Calculated at 0.3 of maintenance7
Makeup minerals953 
Natural gas1,3105,036 
Electricity327929Using a value of $16.70 GJ−1 for both solar44 and grid20 electricity
Total OPEX [M$]$2,117$11,154 
Total OPEX [$ tCO2−1 captured]$33$62 
Total OPEX [$ tCO2−1 produced]$17$32