Ofc. For the Stuxnet vulnerability.

I would hope critical infrastructure would have someone on site 24/7. The Internet could go out, roads blocked, and weather too dangerous for a helicopter and you'd still want power to flow. If people want to work remotely, they could have a human-bridged air gap where change instructions are followed by someone on-site.

More likely windows updates.

Serious answer: there's a big plan to network everything for metrology purposes. At the very least feeding real time frequency, voltage and phase information from every point of interest on the grid into a big dashboard.