Rivus Batteries develops metal-free battery technology for grid-scale energy storage. In the past 18 months, they have developed a working prototype, raised €0.5M in financing from European VCs, and secured two customer pilots for 2024-2025. By 2027, Rivus aims to offer a energy storage solution that's 80% cheaper and greener, targeting a market expected to grow from €50B to €150B by 2030.