Age of Empires Series Wiki

Factory Wood production increased.
—In-game description

Water Power is a technology in Age of Empires III that can be researched at the Factory. Once researched, it increases the rate at which Factories automatically produce wood by 30%, from 5.5 wood to 7.15 wood.

Water Power is useful if the player configures their Factories to produce wood.

Factory technologies
Cannery · Water Power · Steam Power · Mass Production