The sun has always had a unique and essential meaning for mankind. Not only is the sun most important for photosynthesis and therefore for the existence of life on earth as such, but men have also used it as a basic source for measurings from a very early point of their existence on.
Wind turbines are growing up. Environmental conditions for new locations are becoming more and more extreme, colder, and more salt-ridden due to offshore placement. At the same time, the turbines are getting bigger and bigger. This means that they need better reliability over longer periods of use. It takes 8-10 years to amortize the cost of the turbines, followed by several years of operation for the investment to turn profits.