This Battery Energy Storage Roadmap revises the gaps to reflect evolving technological, regulatory, market, and societal considerations that introduce new or expanded challenges that must be addressed to accelerate deployment of safe, reliable, affordable, and clean energy storage to. This Battery Energy Storage Roadmap revises the gaps to reflect evolving technological, regulatory, market, and societal considerations that introduce new or expanded challenges that must be addressed to accelerate deployment of safe, reliable, affordable, and clean energy storage to. Recent shifts in customer preferences within the photovoltaic energy storage system (PVESS) market are increasingly characterized by a digital-first consumer mindset. Modern buyers prioritize seamless digital engagement, leveraging online platforms for product research, comparison, and purchasing. This EPRI Battery Energy Storage Roadmap charts a path for advancing deployment of SAFE, RELIABLE, AFFORDABLE, and CLEAN battery energy storage systems (BESS) that also cultivate equity, innovation, and workforce development. decarbonized electric system is reliable and resilient. Global installed. The Large-Scale Photovoltaic Energy Storage System (PV ESS) market is poised for significant expansion, driven by the global shift towards renewable energy and the imperative for grid stability. As global efforts to combat climate change intensify, the demand for renewable energy sources has surged. 2 billion in 2024 and is projected to reach USD 15.