Not all batteries rely on chemistry. In this episode, I explore mechanical energy storage, focusing on flywheel systems that store power as kinetic energy. These systems deliver high power on demand, operate for decades with minimal degradation, and respond instantly—making them especially useful for stabilizing wind and solar generation where traditional batteries face cycle wear and thermal limits.

I also compare flywheel technology with gravity-based energy storage, examining the cost, safety, and siting considerations that shape real-world deployment. The takeaway is simple but important: the future grid will likely rely on a mix of technologies, each chosen for the job it does best rather than forcing one solution everywhere.