You have yet to mention a thing relevant to libertarians or their beliefs on markets.
In addition to the instantaneous supply demand property - the grid is an electric circuit with ever changing loads that are both capacitive and inductive. Keeping power (both real and reactive) moving efficiently is a non-trivial task.
So this is hard? So is virtually everything we use markets for.
Regulated monopolies (in the US) have an "obligation to serve". If you want power the power company is not allowed to say no, even if the supply is insufficient.
They don't say "no", they just don't deliver at all. That's obviously a vast improvement. And of course, this has nothing to do with markets.
When Apple or Google can put up a data center in a few months from breaking ground to switching it on and draw energy equivalent to a steel mill, but new power plants require more than a decade to site, permit, build, test, and put in service the challenges can be daunting.
And most of the delay is due to California regulation. Again, we have that because this is "daunting", that somehow magically means it can't be done by a market.
Libertarian "markets good - regulation bad" can be as unhinged from reality as creationism. Its bad religion to pretend the world works in accordance with your faith regardless of the data. In these instances free market evangelism isn't an economic theory, its religion.
What data? What reality? I notice you don't bring any up yourself. It's annoying when libertarians are supposed to provide all this data and reality while their Slashdot critics can merely observe that electricity is hard and make up straw men on the fly.