Hackers delete $670B of unpaid Turkish electricity bills

With the amount of connectivity that our modern electricity systems have, it is a wonder that something like this hasn't happened before.

http://www.techworm.net/2014/11/redhack-hacks-turkeys-electric-distribution-company-website-delete-bills-worth-1-5-trillion-turkish-lira.html

This will be very costly for the utility to clean up and reconcile, given that meters will have to be read all over again, and in some cases for long outstanding accounts where people have moved, the utility may take a loss.  It is almost certain that in the end, the electricity customer will pay for the utility's lack of oversight into making sure the data was secure and backed up.  For $670 billion worth of data, how much needs to be spent in securing it?