Sure, and it never hurts to do the math for your particular situation. Being in California I'm probably paying about the same as you per kWh. I do think 20W del

Sure, and it never hurts to do the math for your particular situation. Being in California I'm probably paying about the same as you per kWh. I do think 20W delta is rather optimistic, since the last time I checked a decade ago, laptops only consume 10-15W at idle, and pi's likely consume at least a few watts themselves. Laptop hardware is generally pretty good about reliably suspending to ram and resuming. My general point is that there's a lot of externalized costs to consider depending on what you're trying to optimize for. For example, I live in a somewhat chilly area most of the year, and part of my home is electrically heated rather than by natural gas. I don't particularly care how efficient any electronics are in that part of the house (when I'm using them) because that electricity is converted into useful heat just as well as a space heater would do it.