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Refineries is a technology in Age of Empires III, available at the Plantation in the Industrial Age. The upgrade increases Coin production in Plantations by up to 30%.

Although it is the most expensive technology in the Plantation, costing 600 in both Food and Wood, it benefits the economy in the long run.

Plantation Technologies
Bookkeeping | Homesteading | Refineries | Earth Ceremony | Earth Gift Ceremony | Excessive Tribute