No, it's not. It's a practical problem, not an economic one, but leave it to the tankies here to take it as an opportunity to show how many slogans they have learned.
So why was the problem expressed in economic terms? The practical problem isn't "oh noes there's a price label with a minus on it"; it's that there's a surplus of power which is dangerous.
In reality what that represents is an opportunity for someone to come in, and store the excess power, and sell it back to the grid when supply is lower -- but energy companies only want to model the flow of money going one way.
I agree, if the point had been we didn't have enough energy storage at the grid scale to accommodate the excess power I would agree with that. Instead, it points out the price.
How about this: power generation and distribution is not as easy as you think, it requires lots and lots of infrastructure and maintenance and that has a cost. If prices go negative too much it might become a problem to keep that running. There, that wasn't so hard, now was it?
Negative prices are short-term self-regulation reactions of the market, they can't stay negative long-term, just because of how the system works. So I'm not sure what you're worried about.
Also, cut the condescending tone, it does nothing but make you look like an asshole.
You were. Publicly run power would function the same as the fire department - paid for via taxation to fulfill a societal need instead of charging for profit.
Or, are you under the impression that the Fire Department is privatized?