[ncmncm]

The article makes clear the turbines are running on "auto mode", out of communication with the manufacturer, and that owners are making arrangements to communicate with their turbines by other means than satellite links.

So, it did not "knock out" the turbines, it only knocked out communication with them. That reasonably upsets Enercon, and maybe Enercon's customers, but appears not to reduce the power output from the turbines, so probably shouldn't worry the rest of us much, if they can re-establish contact without relying on the satellite link, which they should do anyway, and if it does not mean that somebody else can take over control of the turbines.

Knowing how equipment is built these days, it would be not at all surprising if in fact it were easy to crack into these turbines' control channels and make them destroy themselves. That doesn't seem to be what has happened here, yet. But sometimes, forcing somebody to go to a backup control method is a first step in breaking in, if the backup method is more easily cracked into.