Question

when the flowing wind is completely stopped by the windmills it can sustainably capture all of energy that was available in the flowing wind

Answer 1

According to the law of conservation of energy,

Energy neither be created not destroyed only transferred.

Thus kinetic energy from the wind will be transformed over to windmills and result in the creation of electricity.
This means, that without burning any oil, gas or other fossil fuels, we will be able to use naturally available energy and convert it into electricity

Answer 2

A few people stress that since wind is extremely variable, we may abruptly lose all our power and get ourselves dove into a "power outage" (a noteworthy power blackout) on the off chance that we depend on it excessively.

The reality of wind is very different. "Variable" does not mean temperamental or unusual. Wherever you live, your energy originates from an unpredictable framework (arrange) of complicatedly interconnected power-producing units (running from mammoth power plants to singular breeze turbines). Service organizations are very proficient at adjusting power produced in a wide range of spots, in a wide range of routes, to coordinate the heap (the aggregate power request) as it differs from hour to hour and every day.

The power from anybody wind turbine will change as the breeze rises and falls, however, the aggregate power created by a large number of turbines, broadly scattered over a whole nation, is substantially more normal and unsurprising. For a nation like the UK, it's practically constantly blustery someplace.