Earlier today, the university where I work had a complete power outage that lasted for about two hours. We realized how helpless we were without our business as usual situation. Auto toilets wouldn't flush, VOIP phones and computers didn't work, as well as all the usual things - heating, elevators, lights, door locks etc. Everything just shut down. The only thing that worked were some people's smart phones so that we could figure out what was happening. But imagine if those were cut off too. It was a good reminder for me that the things we take for granted can all disappear very quickly.