I'm on real-time electricity pricing (https://hourlypricing.comed.com/live-prices/ https://hourlypricing.comed.com/live-prices/) and have been thinking about th

I'm on real-time electricity pricing (https://hourlypricing.comed.com/live-prices/ https://hourlypricing.comed.com/live-prices/) and have been thinking about this for a while. I have a gas-powered main water heater, and my idea involved installing a second electrically heated tank to use as a feed/preheater to the main water heater and would only kick on when the real-time price was near zero or, as it happens in the summer sometimes, slightly negative which indicates a load-shedding situation. At the end the cost of installing this all meant the ROI was really long. But I like this concept.