It’s just scammers trying to cash out. They know Elon has a large (and gullible) following, many of which see him as as trustworthy and a super good business man, making them easy targets.
It ends up as the usual, a scam investment promising huge returns, but of course they just run away with your money.
It’s fundamentally the same scam they use to hack accounts, posing as a rich sponsor and tricking the youtuber into downloading malware that steals their account.
Power companies average things out.
Now some customers specifically ask to pay the instantaneous price, and those people just turn things off. This has the advantage that you end up paying less during times if low demand.