What you’re describing is a pump and dump scheme. In any market where there is low volume, either in terms of units or value, it is possible that a wealthy individual buys a large enough share of the available item to make the price jump up a bunch. Then when other people buy to get in on the next bitcoin/NFT/GME craze, often motivated by person A, that first person can then sell to the next wave.

What is weird about the power grid is that A) electricity has to be used at the time of purchase so you couldn’t resell it and B) there are often power plants specifically for spikes in demand (called peaker plants) that rely on those moments to jump in and produce to make their profit, keeping things under control. However if you’re the Texas grid, which is isolated from any other electric grid, you can just ignore obvious signs that more power is needed and everytime demand spikes you make a bunch of profit and super promise you’ll fix it for the next time