NTPC Green Energy has issued an engineering, procurement, and construction (EPC) tender for developing a 250 MW/1,000 MWh battery energy storage system (BESS) at NTPC Kayamkulam in Kerala.

Bids must be submitted by June 24, 2025. Bids will be opened on the same date.

Bidders can quote for one or both of the following blocks:

• Block-1: 125 MW/500 MWh integrated at 33 kV existing solar pooling switchgear
• Block-2: 125 MW/500 MWh integrated at 220 kV switchyard

The scope of work entails the design, engineering, packaging and forwarding, transportation, unloading, storage, construction, erection, testing, and commissioning of the 250 MW/1,000 MWh BESS on a turnkey basis. It also involves providing operations and maintenance for the BESS for 15 years.

The storage systems must be provided in a standardized container with a minimum DC capacity of 5 MWh per container. BESS containers must be compliant with the National Fire Protection Association requirements.

The BESS and its battery’s designed life must be 15 years (considering daily single-cycle operation) from the successful trial run date.

Selected bidders must also conduct grid compliance studies, reactive power compensations, and power quality compliance for the BESS up to the 400 KV/220 KV grid interconnection point at the NTPC project switchyard.

They must provide BESS containers with battery racks and battery and energy management, supervisory control, data acquisition, power conversion, protection, communication, and high and low-tension systems. Additionally, they must provide high-tension transformers and auxiliary power, monitoring and control, and remote control and monitoring systems.

Successful bidders must also construct a control room with a switchgear room, including all electrical fittings, furniture, and a security cabin.

Recently, NTPC Green invited bids for land and an extra-high-voltage transmission system package to develop up to 900 MW interstate transmission system-connected solar projects in Bhuj, Gujarat.

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