Electrolytes for energy storage historically have been aqueous based. But with the need for sustainability the world is diversifying towards organics to reduce abundance issues of mineral based systems. Allegro Energy has worked for a decade in developing Microemulsion based electrolytes to promote the use of organic materials in energy storage. Microemulsions are thermodynamically stable despite being biphasic, thus offering the best of both ends of polarity. Not only do ME electrolytes offer extensive dissolution of commodity organics without modifi cation, but also additional merits of extended electrochemical windows and composition tuned kinetics and physical properties. This work will elucidate nuances of ME electrolytes from the perspective of microstructure control, interface dynamics and fi nally on using such electrolytes to develop low-cost and sustainable energy storage systems.