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โครงการหนังสืออิเล็กทรอนิกส์ด้านการเกษตร เฉลิมพระเกียรติพระบาทสมเด็จพระเจ้าอยู่หัว

Table 8.4 Estimated water requirements for future bioethanol production in Thailand
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Water requirements (Million m /year)
Dry season Wet season Total

Green Blue Green Blue Green Blue

water water water water water water
Scenario 1: Cassava ethanol plants 754 933 3,974 25 4,728 958

Policy Sugarcane ethanol plants 8 17 75 1 83 18
mandate Molasses ethanol plants 102 295 1,039 159 1,141 454

scenario Multi-feedstocks plants 74 146 534 49 608 195
Total 938 1,391 5,622 234 6,560 1,625

Scenario 2: Cassava ethanol plants 1,047 1,296 5,520 34 6,567 1,331

Full Sugarcane ethanol plants 11 23 104 2 115 25
production Molasses ethanol plants 141 410 1,444 220 1,585 630

capacity Multi-feedstocks plants 103 203 741 68 844 270
scenario Total 1,303 1,932 7,809 324 9,112 2,256

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Figure 8.6 shows the classification of 1,625 million m blue water required in 2021 to
satisfy the AEDP’s target of bioethanol production by the different watersheds. Mun, Chi and

Prachinburi are the three important watersheds that would have the significant increase in irrigation
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water demand for bioethanol production. Considering the water deprivation potentials (m eq/year),
Mun, and Chi would be the two main watersheds that have high potential to confront the pressures
on water stress and competition with other users if the water resources are not properly managed

in the future (as Figure 8.7). Importantly, both watersheds are in the Northeastern region of
Thailand which has the largest crops plantation areas in Thailand. By province, there are three

provinces that potentially have the high impact on water use due to the ethanol policy mandate i.e.

Nakhonratchasima, Ubon Ratchathani and Chaiyaphum, as they would have several new ethanol
plants established there and from the hydrological perspective, those three provinces are under the
Mun and Chi watersheds.

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