That's why I never get variable rates. While you might pay a little less during low demand, there is essentially no cap to the potential cost. It is very similar to selling short in the futures market. You have some potential gains, but effectively unlimited liability. No thanks.
It’s simple math and those Texans should have understood the math.
The lowest price can only go as low as zero, the pricing ceiling does not exist and can be any price.
Those Texans should have read the fine print.