Electric utilities have been fighting the mismatch between when power generation is available and when the loads need the resulting electricity since Edison, Tesla and Westinghouse invented the modern electric utility industry.
The “Duck Curve” is a somewhat new species for this issue, but I’m sure we will be seeing more of its flock-mates as the grid-supply evolves.
This paper will address mismatches between electric supply and demand. I will do this for my home-state (California) and others can do the same for their home state.