Salinity gradient power, or blue energy, has the potential to revolutionize electricity generation. By harnessing the difference in salt concentration between bodies of water, this renewable energy source could unlock a vast potential for clean and sustainable energy. There are three main technologies – PRO, RED, and CapMix – that have been developed to convert the energy stored in the salinity gradient into usable electricity. With a global capacity estimated at 2 terawatts, blue energy could significantly contribute to the renewable energy mix and provide electricity to remote communities.