Things that you can do to save electricity in water heaters:

Avoid over heating of water in water heaters. Keep thermostat at medium levels.

Choose a right sized water heater so that electricity is not wasted in heating extra water that is not required.

Choose efficient (5 star rated water heaters).

Do not keep water heater on for longer durations. Just switch it on a few minutes before you need hot water and switch it off once your work is done.