Guys how come some peoples monthly bills got crazy? like that old guy having to pay 12k for electric bill?
Can energy providers change rates as they want during times of crisis?
Short answer: Because Texas birthed Enron to the world from its vajayjay.
(Not THAT Enron. The original Enron.)
Long answer: Because power pricing contracts, not unlike bond rates or flexible mortgage rates, can be priced by the usual long-term or by the vagaries of the daily market fluctuations. Enron capitalized the crap out of this model, making their execs rich at the expense of the little guy by creating energy supply crises across the country and then swooping in with an extortionist's rate hike to secure new power contracts. This is what ultimately got Cali into its last governor recall and made Arnold Schwarzenegger governor. That's how f'ed up this manipulation got.
Then Enron got caught for fraud and the house of cards collapsed.
Similarly, many customers opted the riskier "day rate" of the market. Not expecting the grid to totally f them over. So these consumers do bear some of the blame for their bills, but not all of it.