http://ecologie.blog.lemonde.fr/2013/01 ... -eolienne/
The concept is also being investigated in Denmark, where the Risø National Laboratory and architects working on an island with a tank km3,3 2 2,75 can produce GWh - equivalent to the consumption of Copenhagen during 24 hours .
The calculation of the cost:
http://objectifterre.over-blog.org/2014 ... rines.html
At three km off the Belgian town of Wenduine, the sea is deep only 4 meters on average. The dam will be high 4 + = 10 14 meters. The cost of such a dam is about 30 M € / km. The Belgian project is an atoll of 1,25 km radius, which corresponds to 7,85 km dyke, 234 M €. Surface km4,9 2, 10 meters of vertical drop, where storage 610 MWh, equivalent to MW x 30 20 hours. This STEP can attend approximately 100 MW of wind power (300 GWh / year with CF 35% 3000 million kWh in 10 years). 30 MW turbine STEP cost 18 M €. Total dam turbines +: 252 M €. The additional cost of the WWTP is so 8,4c € / kWh wind.
The perimeter of a disk believes in the power 1 and 2 its surface to power more atoll, the more profitable it is. A STEP 5,6 km radius provides an additional cost of only 4 c € / kWh. Demonstration here:
http://seatec.over-blog.com/2014/04/awe ... ergie.html
Edit: since split energies-fossil-nuclear / jean-marc-Jancovici-is-it-a-con-t14740.html