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I don’t know why you’re framing this as solely a demand problem, or why you think the elasticity of demand won’t extend to negative prices. Negative prices tend to show up only during periods of very high supply, due to a confluence of factors like weather, so supply is part of it (low or even negative prices can induce producers to curtail production). There’s nothing special about the number zero.
And negative prices therefore take the place of disposal: oversupply and the need to expand real resources taking that energy off of the grid in that particular moment. That’s demand, too: incentivizing people to do what needs to be done, and get rid of that excess energy by disposing it or whatever.
And that introduces a specific type of supply chain threat: someone who possesses a computer can infect their own computer, sell it or transfer it to the target, and then use the embedded microcode against the target, even if the target completely reformats and reinstalls a new OS from scratch.
That’s not going to affect most people, but for certain types of high value targets they now need to make sure that the hardware they buy hasn’t already been infected in the supply chain.