If you live in Michigan and have Consumers Energy you can sign up for a free Nest thermostat E, using their Peak Power Savers Smart Thermostat Program. It allows them to change they thermostat during peak times.
Quote from the program link. “this doesn’t mean you lose control of your settings: you’ll always be notified about upcoming Energy Savings Events, and you can override automatic adjustments at any time”
I got one. It will be on eBay soon. What makes it really funny is that it is for Consumers Power Electric customers. They marked me eligible even though I only buy gas from them. My electricity comes from DTE.