the sound of the grid...
A sub station not far from here. When you can hear the 50 Hz electric hum in the air you know that the warning signs aren't just for show. The openness of these stations is surprising considering the havoc that could be caused by someone breaking in, albeit at the risk of death. I wonder how long it will be before every house has a solar panel, with distributed power generation supplementing the grid a norm. Just like water tanks.
Maybe it's not as far away as people would assume...