tibbie said:
if a generator is generating 20MW and only 5MW is used where does the other 15MW goes?
Dera Tibbie ;
First, the power of all sources is ” … kVA ” and not in ” …W “.
About your Generator :
As we know all a ” source ” either Generator or Transformer can supply the installed loads, so, the circulated current and consumed power are relative to the loads and not to the source, and we say that the source is ready to supply the loads till to total loads' power will be approximately equal to the source's power with certainly some percentage of reserve.
In your case, you will have some losses of fuel and will have a mechanical damage in the engine, because we should consume at least 45-50% of the generator's power once running and not less.
Regards.