Costs of Ocean Sequestration

Storage cost for cases of ocean storage using an injection platform is the sum of three major components: tank storage of CO2 onshore awaiting shipping; shipping of CO2; and the injection platform pipe and nozzle. The sum of these three components is 11.5 to 12.8 US$/t CO2 shipped 100 to 500 km. Assuming an emission equal to 3% of shipped CO2 from boil-off and fuel consumption, the estimated cost is 11.9 to 13.2 US$/t CO2 net stored.

Liquid CO2 could be delivered by a CO2 transport ship to the injection area and then transferred to a CO2 injection ship, which would tow a pipe injecting the CO2 into the ocean at a depth of 2,000 to 2,500 m. Estimated cost of ocean storage is again the sum of three major components: tank storage of CO2 onshore awaiting shipping; shipping of CO2; and the injection ship, pipe and nozzle. The sum of these three components is 13.8 to 15.2 US$/t CO2 shipped 100 to 500 km. Assuming an emission equal to 3% of shipped CO2 from boil-off and fuel consumption, the estimated cost is 14.2 to 15.7 US$/t CO2 net stored.

Compared with the ship transport option, pipeline transport of CO2 is estimated to cost less for transport over shorter distances (e.g., 100 km) and more for longer distances (e.g., 500 km), since the cost of ocean storage via pipeline scales with pipeline length. The cost for transporting CO2 from a power plant located at the shore through a pipeline running on the sea floor to an injection nozzle has been estimated by IEA-GHG (1994) and Akai et al. (2004). In the recent estimate of Akai et al. (2004), CO2 captured from a pulverized coal fired power plant with a net generation capacity of 600 MWe is transported either 100 or 500 km by a CO2 pipeline for injection at a depth of 3000 m at a cost of 6.2 US$/t CO2 net stored (100 km case) to 31.1 US$/t CO2 net stored (500 km case).

There are no published cost estimates specific to the production of a CO2 lake on the sea floor; however, it might be reasonable to assume that there is no significant difference between the cost of CO2 lake production and the cost of water column injection given this dominance of pipeline costs. 

Ocean sequestration

Costs of ocean sequestration


 


 


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