Wind turbine blades might cease rotating due to several circumstances, such as rapid or sluggish wind speeds and adverse weather conditions. The turbines will cease spinning if they cannot get any energy from the wind or if their blades are damaged by too fast movement.
It is common for wind turbine purchase and installation costs to be recouped within the first 5-15 years of operation. With a life expectancy of 25 years, there is a possibility of at least 10 years of profit, besides repair and maintenance costs.
The United States Department of Energy reports that most modern land-based wind turbines have blades of over 170 feet (52 meters), resulting in a total rotor diameter longer than a football field.
A hydraulic cooling unit intended for wind turbines consists of a motor pump, immersion heater, thermostatic mixing valve, pressure transmitters, pre-wired junction box, air-excluding valves, expansion vessel, and temperature sensors.
Commercial turbines of the 1980s, such as the Vestas V17, ran 15 m blades and produced 75 kW. 5 MW machines carried 40 m blades. 5 m blade, and public roadmaps show prototypes nudging 120 m.