California and Australia are experiencing significant growth in grid-scale battery storage, with California reaching a new peak of 44% of evening demand and Australia's South Australia reaching 30%. The rapid rollout of battery storage in California over the last five years has allowed for a reduction in reliance on gas and the ability to supply a significant share of demand throughout the evening. With a total capacity of over 17 GW in California, grid-scale batteries are proving to be a key solution in transitioning towards a more sustainable energy system.