Some Concordia University professors set up a Minecraft server, and powered it with solar panels and a battery ...
... then added GUI text that shows players data on the energy ecosystem: Battery level, solar panel output, and how much energy the server is requiring at any given instant
fascinating psychological effects ensue ...
... as the players begin to notice how different actions they take inside the game use different levels of energy
Item #8 in my Linkfest: https://buttondown.com/clivethompson/archive/linkfest-27-aztec-death-whistles-supercircular/