Generators

A few days ago, on ATV in the program Khwaja Online. A caller complained out power outages and how the political rallies consumed so much electrical power. Khawaja replied that rallies were powered by generators and not the national grid. That reminded me of something I learnt a couple of years back while organizing an IEEE conference.
When you invite a government official to an event, a side benefit is that the local electric supply company - KESC or LESCO, for instance - is informed about the event timings and told that they should ensure power during the event. So, the event organizers dont have to arrange generators. The electric power providing company, on the other hand, has to. So, where does the expense of that generator go if KESC/LESCO bears it?