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Actual statistics are located at the bottom of this answer.

Bonneville dam's power production approaches 3x that of the Grande Coulee dam, although it's physical size is much smaller.

The reason for this is because, as with any other river, the farther down stream you go on the Columbia, the more tributaries (streams feeding larger streams or a lakes) there are that dump into it, each one increasing the rivers total water flow. This additional waterflow increases the power of the river, which in turn allow dams that are built lower on rivers to produce more power than those built farther upstream.

Bonneville dam

-Power production

---51 billion kilowatt/hours per year.

-Length

---2,690 ft (820 m)

-Height

---197 ft (60 m)

-Number of turbines

---20

--Grand Coulee dam

-Power production

---21 billion kilowatt/hours per year

-Length

---5,223 ft (1592 m)

-Height

---550 ft (168 m)

-Number of turbines

---33

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Q: Which produces more power-Bonneville or grand coulee dam?
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