Futaba lines were energized

Lines into units 5 and 6 were hot at the F1 plant substation.
From METI Causes and Coutermeasures, March 2012, here, p39.

Note that all the Ohkuma lines tripped (the White X's), either at the plant substation or at the transmission substation. Protection equipment activated to protect the equipment from electrical damage. Physical damage is still a possibility, and some happened (the Red X's). The same types of physical damage could happen at either end of the wire. The equipment at each end is about the same, and both ends received some physical damage from the shaking, the plant more.

Bad design. Easy to say.

What in the world do you make of the little note on the left that says that a transmission line was good-to-go by 7pm that night. Does that refer to the small power line that runs parallel to the first base line, just south west of unit 4? Tower behind home plate.