A system and a method of controlled electrochemical power generation are disclosed. The system includes an electrochemical cell comprising an alkali metal anode, a cathode initially spaced about 10-25 mils from the anode to define a flow channel, an electrolyte comprising an aqueous solution of the hydroxide of the alkali metal and, for example, a separator system adapted for providing a substantially uniform pattern of flow of the electrolyte through the flow channel is utilized in a system and method of controlled power generation. Flow control valves may, for example, be used to control the volumetric flow rate of the electrolyte through the flow channel thereby attaining substantially uniform voltage from the cell.