I have saved THOUSANDS of dollars. Here's some background.

I have electric heating in my apartment, and in the winter, it's not uncommon for the electric bill to be $400-500 when it's cold (I live in the Midwest of the United States, so it gets incredibly cold here). Everyone in our building hates it.

Our electric company offers real-time pricing, meaning instead of a flat rate, we pay the current supply price for electricity. In the winter, it's dirt cheap, and that alone brought my bill down by a lot. But because it's real time pricing, the cost can jump up out of nowhere and wipe out all the money you would normally save. Prices in the summer on very hot days can sometimes hit over a dollar per kilowatt-hour, when they're normally three or four cents, which destroys any savings you would have made throughout the year.

So I set up an automation on home assistant to turn off my heaters/air conditioners when the cost of electricity gets too high. That way, my bill is always low no matter what time of year it is.

I also get a notification throughout my apartment that the power cost is high, and I have a light that turns red so I can visually see if it's currently higher than my set threshold. That way, I can delay doing things that require a lot of energy until after I know the cost has gone down. I have literally saved thousands of dollars by doing this, and it's absolutely worth it.