Reading Comprehension

This is from a comprehension passage:

Laird Gogins is fifty-seven-year-old inventor who has developed a device to harness the power of the wind. He claims that his invention could eventually provide all the electrical power needed by the United States. A network of his wind machines across the country could transfer electricity produced in a windy spot to a place where the air is still. Just one of Gogins' wind machines will produce eighty megawatts of electricity, which is ten times the power produced by all the windmills in the United States were captured. It could provide one hundred percent of the electrical power now consumed. However, the inventor admits that the wind will probably never become the country's sole power source.

The word "capture" means most nearly ..........
A. put under arrest
B. brought to the inventor's attention
C. brought under control
D. put into operation
I opt “C. brought under control”. Is it true?

I want to ask about the structure of this sentence “Just one of… were captured”. Is it “the power were captured”. I have searched for the meaning of “capture” and find that it has some meanings like “take control of a building, place, etc.
I do need to know “capture” here (in this sentence) really mean what because although I choose “C”, I quite don’t understand what its meaning. Does it mean we “have taken control of the power produced by all the windmills in the United States”?)

Many thanks for enlightening me.