Bonded multilink serial transport with EIGRP delay tuning to control path preference across links of unequal capacity, HSRP router pairs at every site with cross-over links between them, and a Checkpoint firewall separating the energy management system zone from everything outside it. The EMS estate itself ran on Sun and Windows hosts.
Real-time telemetry off a generating plant is not a reporting feed. If the monitoring centre cannot see the machine, nobody is watching a turbine on the other side of the world.
Outcome
A monitoring centre that kept seeing the machines when a circuit failed.