The Blue Battery is an alternative storage medium in which electrical energy can be stored and extracted by reactions from a redox couple. When a Blue Battery is charged, energy, in the form of electrical energy, is added to energy-poor substances. The acid-base-salt fuel stack can serve as a sustainable alternative. The principle of this fuel stack is based on the properties of ion-selective membranes in combination with acidic, basic and saline solutions, whereby water can be split and formed without the formation of gas. The substances can be re-used and the battery could form an new alternative to store solar or wind energy on household level. In this way people can sustainable produce and store energy by using water.