If you have a Pre-1994 dishwasher then upgrading to an ENERGY STAR certified model can save you up to $30 a year in energy costs. ENERGY STAR dishwashers use less water than newer standard models.
Avoid wasting water by pre-rinsing plates and dishes before putting them in the dishwasher. You only need to scape the food from the dishes. This simple practice can save hundreds of gallons of water a year.
Wash only full loads of dishes. However, overloading the dishwasher is undesireable as it will lead to poor water circulation and unwashed dishes.
Clean the dishwasher drains and filters frequently to maintain operational efficiency.