Industrial wind turbines are a lot bigger than ones you might see in a schoolyard or behind someone’s house. As wind energy has expanded into less and less ideal wind areas they have gotten larger, and most being installed are ranging from 400 to as tall as 700 feet.
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RES has stated that they are installing 2.75MW Turbines. 498 Feet tall.

Rotor diameter of 393 feet (120 meters).
Example of that is the GE 2.75

Hub Heights 85m,110m,120m,139m
Tip Height 145m,158.3m,170m,180m,199m
Noise 106dBA
Frequency 50Hz & 60Hz
Blades 60m
Technology Model based controls & Cold weather extreme

Are bigger turbines more efficient?

No, they are just bigger. Output depends on wind speed and the combination of blade diameter and generator size. Bigger blades on a taller tower can capture more wind to run a bigger generator, but they don’t do so more efficiently than smaller models, and they require a correspondingly larger area around them.