سوال ۲۸ کنکور ارشد مهندسی برق ۱۴۰۰

PASSAGE 3 (paragraph 2):

Today, around the world, the wind-electric turbine is becoming as iconic as the Dutch windmill. A wind turbine typically consists of a large, three-bladed propeller, called a rotor, atop a tower that's high enough that nothing blocks it from the wind. The turbine has a drive train similar to a car's engine that includes an electric generator. The electricity generated gets added to the electric grid, <u>which</u> powers hundreds of homes and businesses in a geographic location.

Question: The word "which" in paragraph 2 refers to ..........