NTPC has invited expressions of interest (EoI) to develop a pilot or utility-scale long-duration energy storage (LDES) project based on compressed air or liquefied air technologies. The proposed system will have a storage capacity of up to 1,000 MWh.

According to the guidelines of the EoI, the project does not require any earnest money deposit or bank guarantee at this stage. The project seeks to assess the current market landscape, technology maturity, technical performance, and operational characteristics of the proposed technologies. It will also evaluate their suitability and techno-commercial viability for pilot or utility-scale deployment under Indian grid and site conditions.

Furthermore, the project can be implemented under various models depending on the techno-commercial viability of the technologies. These include engineering, procurement, and construction mode with operations and maintenance, build, own, and operate model, build, own, operate, and transfer model, and a shared or hybrid model. The bid submission deadline is February 23, 2026.