medium · GMAT Verbal
Winds at 500 meters are stronger and steadier than those at the 100-meter hub height of conventional turbines. A developer notes that its tethered kites fly at 500 meters, where more wind energy is available, and concludes that its kite system will therefore generate electricity more cheaply per kilowatt-hour than ground-based turbines do.
Which of the following, if true, most weakens the developer's conclusion?
- Conventional turbines have been manufactured at large scale for decades.
- Wind speeds at 500 meters vary somewhat by geographic region.
- The kites require continual automated steering and frequent tether replacement, making their operating and maintenance costs per kilowatt-hour far higher than a turbine's.
- Some communities object to the visual appearance of tall conventional turbines.
- Kites occupy less ground area than a turbine of comparable rated capacity.
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