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http://www.firstwindblog.com/a-day-in-the-life-as-a-bull-hill-wind-operator/

"Two SunEdison employees and six Vestas employees work at Bull Hill daily..."

"An average [311 foot] turbine climb takes around 10 minutes and is performed two to four times per week."

"in a 2–MW wind turbine, the weight of the rotor and the tower is typically about 250 tons [...] a kite generator of the same rated power can be obtained using a 500–m2 kite and cables 1000–m long, witha total weight of about 2 tons only."

http://www.dariopiga.com/Papers/Conference/ICREGA2010Kite.pdf