Battery energy storage is essential for maximising the potential of renewables, and with costs falling 93% since 2010, it has shifted from a costly barrier to a key enabler of the energy transition. In this episode, Deborah Ayres, Renewable Energy Costs team at IRENA explores the drivers behind the cost reductions, policies needed to accelerate deployment and why affordable battery storage is essential for modernising grids, integrating more renewables and achieving the goal of tripling renewable capacity by 2030.