Should we wash full loads or smaller loads in the dishwasher and the washing machine?

You should do full loads to get the most from the electricity used for the cycle, regardless of the size. You should also try to run these appliances during off-peak hours. Peak hours are generally 3 to 8 p.m. in the summer and 6 to 9 a.m. and 5 to 9 p.m. in the winter.