Tell the ladies in the house, a shower only takes 2 minutes, not 30.
Replace all lighting with LED, checkout the LED wattage to your stuff equivalent to do the same job.
Fill any open space in fridge/freezer with plastic bags etc. Periodically, pull the fridge/freezer out, turn off the power to it, unscrew the panel covering the gubbins, clean out all the <deleted> build up with vacuum and brush, ensure air can be pulled in and expelled by the fridge gubbins cooling fan. Don't take too long doing it if you have frozen chips. ????
I bought switched twin plug sockets for regularly used stuff, saves pulling plugs all the time, plus they have small LED lights telling you if an appliance is still switched on, very handy..