NTPC Green Energy Limited has issued an engineering, procurement, and construction (EPC) tender for a 250 MW/1,000 MWh battery energy storage system (BESS) at its Kayamkulam site in Kerala. The project is divided into two blocks: Block-1 includes 125 MW/500 MWh to be integrated with the existing 33 kV solar pooling switchgear, and Block-2 includes 125 MW/500 MWh at the 220 kV switchyard. According to the tender guidelines, scope of work covers the complete design, engineering, packaging and forwarding, transportation, unloading, storage, construction, erection, testing, and commissioning of the BESS on a turnkey basis. The scope also includes provision of high-tension and low-tension systems, transformers, auxiliary power, monitoring and control systems, and remote monitoring. Bidders may quote for either or both blocks. Additionally, the bidders are also required to carry out grid compliance studies, reactive power compensation, and ensure power quality compliance up to the 400 kV/220 kV interconnection point at the NTPC switchyard. They must supply BESS containers equipped with battery racks, energy and battery management systems, supervisory control, data acquisition, power conversion, protection, and communication infrastructure..
The selected bidders will be responsible for operations and maintenance of the storage system for 15 years. Furthermore, successful bidders must also construct a control room with a switchgear room, all electrical fittings, furniture, and a security cabin. The BESS must be delivered in standardised containers with a minimum direct current capacity of 5 MWh per container. These containers must comply with National Fire Protection Association requirements. The design life of both the BESS and its batteries must span 15 years from the successful trial run date, assuming one full cycle per day. The deadline for bid submission is June 24, 2025.
