49 two MW Vestas wind generators
$3 to $4 million each installed
Total weight a whopping 380 tons each
Normal rotor speed 19 RPM
Cut-in speed 9 mph
Cut-out speed 56 mph
Nacelle 18' x 34' x 12' weighs 68 tons
3 Carbon fiber blades 160' long wt. 40 tons
300 foot tower 275 tons
Gravity Spread Base 40 - 60 feet diameter
40 tons of steel reinforcing bars
450 cu yd concrete
Step One The BASE
Step Two The TOWER
Step Three Generator Assembly
It took about an hour to get the blade on and unclamp the carrier.
If you look closely at these two photos you can see that the blade has been rotated 90 degrees. At this point you could hear the sound of more impact drivers tightening more bolts. My guess is that the best tightening takes place on the bottom half due to the weight of the blade and also would put the bolts at a more reachable height. Will have to ask more about this procedure. Each of the blades has a hydraulic ram attached to it that is used to control the pitch of it for efficient use of different wind speeds.
With the first blade attached the Nose Cone is rotated and the process repeated two more times. Lift, attach, rotate, repeat! Pretty well oiled operation. You could tell this was not their first time doing this.
And then it was complete and the giant crane moved off over the access road to another pre-stagged
location to do another one. One down 48 to go! The crane moved at a snails pace but it was rock solid. The more that six foot diameter block at cables end never even swung.
I welcome any and all questions and will do my best to seek out the answers. The more we know and understand this technology the sooner more will get on board. The renewable energy train has left the station in Darlington, Wisconsin. 53530