Competitors. Monitoring the network could be used for corporate research; for exam-
ple, gathering info about how a company uses electricity, from which utility, and for
what loads. The curious party could be a competing utility, or a manufacturer of more
electrically efficient equipment.
Human error. This can affect control system implementation (thus the need for com-
missioning), key sharing, network administration, physical security, upgrades, flaws
in software and hardware development, etc.