Source: Secondary Research, Interviews with Experts, MarketsandMarkets Analysis The global battery energy storage system market is projected to grow from USD 50. 96 billion by 2030, at a CAGR of 15. This accelerated growth is driven by the rapid deployment of. . Some major companies involved in the global energy storage as a service industry include Siemens Energy, Customized Energy Solutions, and YSG, among others. Siemens Energy is a Germany-based solution provider for conventional and renewable energy sources.