Power cut at the studio

If the studio has a UPS (battery backup), it keeps critical equipment running only for a short time, often minutes. Use that time to keep audio going and to plan.
Switch the station to its backup audio or automation (or the transmitter site's backup) if you can.
Save work and shut down non-essential equipment, so the UPS lasts longer.
Report the outage, and when power returns, check the playout, STL and stream all came back on their own.