Abstract: An alkaline flow battery assembly comprising an electrochemical reactor including a positive compartment (5) and a negative compartment (3); wherein the positive compartment (5) comprises a positive electrode (5a) and houses catholyte (5b) whereas the negative compartment (3) comprises a negative electrode (3a) and houses anolyte (3b); wherein the negative compartment (3) is connected through a conduct (1a) in fluid communication to a first container (1) storing anolyte whereas the positive compartment (5) is connected through a conduct (2a) in fluid communication with a second container (2) storing catholyte; and wherein the anolyte and the catholyte are identical alkaline redox solutions comprising a first electro-active species A and a second electro-active species B, being the species A and B compatible between them; and wherein the negative compartment (3) and the positive compartment (5) are separated by means of a microporous separator (4).