They all seem to be listed here (homepage of Ålands Vindenergi, the company mentioned in the diary), the four in particular I mentioned in my comment above ("Fortuna", "Fredrika" etc) are Vestas 600Kw with a wing span of 44m and a hub height between 45m - 50m.

As for maintenance, I'm assuming Ålands Vindenergi handles its nine (soon to be 13), but I couldn't say if they have enough knowledge "in-house" or hire outside expertise.

"The basis of optimism is sheer terror" - Oscar Wilde