Energy-efficient appliances are appliances with the Energy Star label. The label tells you how much you can save on a yearly basis by using that product.
A washing machine or dishwasher that has the Energy Star saves you twice because they not only use less energy, they use less water.
Consider making the investment in new appliances especially if your current appliances are 15 years old or older. The return on investment will surprise you. Also, check with local, state and the U.S. government and your insurance company to see if there are discounts and/or rebates that will help offset the costs of your new investment.