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Putting CO2 to Use: Creating Value from Emissions Technical analysis Is CO2 yield boosting scalable? The global demand for CO2 for biological yield boosting in the horticulture sector is unknown. Of the total greenhouse area worldwide, only a very small share uses CO2 to stimulate plant growth. The clear leader in the use of CO2 delivered to greenhouses is the Netherlands, with an estimated annual consumption between 5 and 6.3 MtCO2. Of this amount, approximately 500 ktCO2 per year is taken from external sources, mainly industrial plants, and delivered to nearly 600 greenhouses (1 900 hectares) in the Western part of the country (Alberici et al., 2017; OCAP, 2019). By using externally sourced CO2, 140 million cubic metres of natural gas are saved on a yearly basis. This corresponds with a reduction of some 250 ktCO2 per year (OCAP, 2019). The current market in the Netherlands is not limited by demand, but rather by supply of low-cost and high purity CO2, as well as by a lack of pipeline infrastructure. The global potential for CO2 use in greenhouses easily outstrips an amount of 10 MtCO2 per year. In addition to low-cost and pure CO2, the main conditions for further expansion of the market is CO2 and heat transport infrastructure, as well as the availability of heat sources in close proximity to the greenhouses, such as industrial facilities and waste-to-energy plants. Under what conditions is CO2 yield boosting competitive? The use of external CO2 for yield boosting in greenhouses is already competitive in several places. Typically, these locations are in close proximity to industrial sources with low-cost and high-purity CO2, low-cost waste heat and with a CO2 pipeline infrastructure. In many other places, costs for external CO2 and heat supply, including for new pipelines, outweigh the potential revenues or are higher than the costs of CO2 and heat from a gas-fired boiler or cogeneration plant. Opportunities for further market growth of CO2 use are therefore near areas with low-cost and high-purity CO2 sources. Ideal distances between the greenhouse and industrial source of CO2 and heat are within 10 km and 5 km, respectively (Alberici et al., 2017). Depending on the transportation distance, in general, a minimum scale of the (cluster of) greenhouses is required, to warrant investment in dedicated CO2 capture and the required transportation infrastructure. Can CO2 yield boosting deliver climate benefits? Climate benefits can be achieved if the externally-sourced CO2 is displacing onsite CO2 production, or if the CO2 is captured directly from the air. On average, around 20% of the CO2 fed to the greenhouses is absorbed by the crops, while the other 80% is vented with fresh air intake to control humidity (Alberici et al., 2017). The absorbed CO2 is fixed in the crops for a relatively short period until it is released into the atmosphere. To achieve carbon abatement, displaced CO2 emissions from natural gas combustion need to outweigh the emissions related to capture, purification and transport. PAGE | 64 IEA. All rights reserved.PDF Image | Putting CO2 to Use Creating value from emissions
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