Ecofanatics will be angry at this, but the only thing power saving and water saving does if you can afford it is increasing the price for one unit of electricity/water. Does the costs of the production, transport, material and labor costs of electricity decrease by lower consumption ? No. You will still need to pay the people who fix the power lines or pipes, pay the people who are working at power plants or pump and cleaning stations, you will still need to pay for coal or uranium in power plants, for various cleaning chemicals in water cleaning plants, etc. So all you get for 10% reduction of consumption of a country in electricity is roughly 10% increase in price of electricity.