Nature hates a mess. When a freshwater river meets the salty ocean, the resulting chemical difference creates an immense concentration gradient. The potential energy generated by this single natural occurrence is equivalent to a 300-foot waterfall—a 30-story skyscraper of invisible, passive energy sitting at the mouth of every major river. In this breakdown, we explore the exact thermodynamics of Reverse Electrodialysis, why Norway’s 2009 First-Of-A-Kind osmotic power plant was ultimately shelved by investors, and why Sera Engineered believes the future of the global grid relies on harvesting the earth’s natural entropy.