between 23% and 50% of the population have a consumption of electricity that no one has any use of. 23% have turned on the light in unused rooms, 39% have unused devices turned on and 50% have unused devices on stand-by.

This is all lower case. Can you fix that?
Between 23% and 50% of the population have a consumption of electricity that no one has any use of. 23% have turned on the light in unused rooms, 39% have unused devices turned on and 50% have unused devices on stand-by.