Diesel and any other types of generators are most commonly disasters and power outages. Used mainly to ensure there is electricity and keeping food chilled and frozen during power outages and in many other circumstances. It understandable to find many homes across the world who have a portable generator at hand, at all times for this very reason.
But generators have many more applications. They are used to help power events and are used by a large amount of local and global business. This also includes schools and hospitals that use them as a form of standby and backup power source. In the event of any power outage and as a source of additional power when required.
Here's are different events that can put generators to further use: