Adding renewables and batteries to our power grid cuts emissions and can lower costs. But it also makes grid stability a more complex affair. That's in part because these systems tend to have less "inertia" -- a byproduct of turbine rotation that helps insulate grids against fluctuations in supply and demand. The old models and heuristics for inertia management no longer apply, and grid operators compensate by running their systems more conservatively -- higher cost, and higher emissions. What's the alternative? Frederico Rauter is chief revenue officer at Reactive Technologies, a Series C startup with a pioneering new technology for precise inertia measurement. Frederico tells us: -- What inertia is, and how their technology improves upon the current tools for monitoring it -- Why utilities can be slow to adopt new technologies, and how they've developed their product with those obstacles in mind -- How he built a career before Reactive tackling innovation in large corporates (SNCF, Siemens) If you'd like to connect with Frederico or share your thoughts on this episode, please write to edmund.downie@princeton.edu.