The Operational Technology (OT) networks (such as industrial control and supervisory control and data acquisition systems [ICS/SCADA]) that run today’s modern society are a collection of devices designed to work together as an integrated and homogenous system. If one of these systems fails, it can have a catastrophic domino effect. For example, electricity requires telecommunications to transfer information on wheeling power from the electrical grid.

https://blog.fortinet.com/2017/12/06/the-importance-of-operational-technology-ot-systems-for-a-standard-of-living-in-today-s-modern-society