As you say, base power is just a concept. It is not a thing that exists in the real world. It's also a bad concept. Electricity demand and supply can be modelle

As you say, base power is just a concept. It is not a thing that exists in the real world. It's also a bad concept. Electricity demand and supply can be modelled statistically for a significantly better understanding than can be compressed into a single term like "base load". But that doesn't admit for very good rhetoric on internet forums.