Bad Day At Work
At least all of the technicians working on the project are safe.
This is the result of lightning damage, incurred during a blizzard (of all things!) - a most unpropitious event, I grant you.
It's not all that unusual to get a lightning strike - what's unusual is for it to occur on seven turbines in a five-minute period. Some parts of the blade that used to exist on this turbine were found several hundred feet away.