These systems are broadly categorized into thermal storage, electrical energy storage, mechanical energy storage, chemical storage, and hydro storage, each with distinct mechanisms and applications. Meta Description: Explore the key types of container energy storage systems, their applications across industries, and market trends. Discover how modular solutions like EK SOLAR's products enable flexible power management. Container energy storage systems (CESS) have become the Swiss Army knife of. A Containerized Energy Storage System (ESS) is a modular, transportable energy solution that integrates lithium battery packs, BMS, PCS, EMS, HVAC, fire protection, and remote monitoring systems within a standard 10ft, 20ft, or 40ft ISO container.