If I were to guess, I'd say that buying electricity at 3 cents/kWh and selling it at 12 cents/kWh is profitable enough that you can afford to give away a thermo

If I were to guess, I'd say that buying electricity at 3 cents/kWh and selling it at 12 cents/kWh is profitable enough that you can afford to give away a thermostat to attract new customers. There's a $300 cancellation fee so they'll get their money back if you depart early.