text: Firstly, Ca-looping offers greater cost advantage compared to conventional amine-scrubbing technologies. The cost/metric ton for CO captured through Ca-looping is ~$23.70 whereas that for CO captured through amine scrubbing is about $35–$96.  This can be attributed to the high availability and low cost of the CaO sorbent (derived from limestone) as compared to MEA. Also, Ca-looping imposes a lower energy penalty than amine scrubbing, resulting in lower energy costs. The amine scrubbing process is energy intensive, with approximately 67% of the operating costs going into steam requirements for solvent regeneration. A more detailed comparison of Ca-looping and amine scrubbing is shown below.