Telangana Power Generation Corporation Limited (TGGENCO) has announced the results of its auction for setting up 375 MW/1,500 MWh standalone battery energy storage systems (BESS). Coal India and Sarus Infrastructures both have secured 187.5 MW/750 MWh capacities for projects located at the Choutuppal and Maheswaram substations, respectively. The estimated cost of the Choutuppal project stands at Rs 10.57 billion, while the Maheswaram project is valued at Rs 10.15 billion.The tender was issued in November 2025.
Additionally, both the developers are required to connect the BESS to the substations at the 400/220 kV level. The BESS must support one complete charge-discharge cycle of four hours daily and ensure a minimum annual availability of 95 per cent. Moreover, the projects must achieve a monthly AC-to-AC round-trip efficiency of 85 per cent. The developers may draw auxiliary power either through separate metered connections from discoms or from interconnection points. TGGENCO will provide land on a right-to-use basis at a nominal lease fee of Re 1 per acre per year.
The projects are to be commissioned within 18 months from the effective date of the battery energy storage purchase agreement, which will be signed within 30 days of issuing the letters of award and remain valid for 15 years post commissioning. Furthermore, viability gap funding of Rs 1.8 million per MWh will be provided in three instalments, including 20 per cent at financial closure, 50 per cent at commercial operation, and 30 per cent one year after commissioning upon certification.
