An osmotic power generator comprising an active membrane supported in a housing, at least a first chamber portion disposed on a first side of the active membrane for receiving a first electrolyte liquid and a second chamber portion disposed on a second side of the active membrane for receiving a second electrolyte liquid, a generator circuit comprising at least a first electrode electrically coupled to said first chamber, and at least a second electrode electrically coupled to said second chamber, the first and second electrodes configured to be connected together through a generator load receiving electrical power generated by a difference in potential and an ionic current between the first and second electrodes. The active membrane includes at least one pore allowing ions to pass between the first and second sides of the membrane under osmosis due to an osmotic gradient between the first and second electrolyte liquids to generate said difference in potential and ionic current between the first and second electrodes.