They have a smart rate program, where they give you small discount on regular rates in exchange for high rates in high-consumption days (they choose them and tell you in advance) between 2pm and 7 pm. That's when you get the crazy rates. But if you avoid consuming too much power in these hours, it still comes out as beneficial for you. Outside of the peak rates, highest rate I see on my bill is tier 4, $0.35114/kWh.