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Shreyas Sortex Secures NVVN Contract for 250 MW / 500 MWh Standalone Battery Storage Project

Shreyas Sortex Industries has emerged as the successful bidder in NTPC Vidyut Vyapar Nigam’s (NVVN) auction for setting up a 250 MW / 500 MWh standalone battery energy storage system (BESS) in Kerala. The tender for the project was issued in October last year.

The storage facility will be established at the 220 kV Brahmapuram substation in Kochi, with grid connectivity at the 220 kV voltage level under the jurisdiction of the Kerala State Electricity Board Limited (KSEBL).

Shreyas Sortex won the capacity with a quoted tariff of Rs181,000 per MW per month. Other bidders in the auction included OPG Power Generation, Oriana Power, DB Power BESS Storage, NTPC Green Energy, and Power Grid Corporation of India.

The project will receive viability gap funding (VGF) of Rs1.8 million per MWh, translating to a total support of Rs900 million for the full 500 MWh capacity. The system is designed for a two-hour discharge duration, delivering a power rating of 250 MW.

Under the agreement, the BESS will be operated for a contract period of 16 years, during which the developer will be responsible for complete operation and maintenance, including system safety, performance, and compliance requirements.

The project scope covers design, engineering, supply, installation, testing, commissioning, and long-term operation of the storage system. It also includes the construction of a dedicated interconnection bay at the 220 kV state transmission substation, along with associated control, protection, metering, and cybersecurity infrastructure.

The scheduled commissioning timeline is 18 months from the effective date of the battery energy storage purchase agreement, with a maximum allowable delay of six months, subject to liquidated damages.

Performance benchmarks mandate a minimum round-trip efficiency of 85%, annual availability of at least 95%, and support for one full charge–discharge cycle per day, amounting to 400 cycles annually. The dispatchable capacity must remain no lower than 70% at the end of the 16-year term.

Penalties are built into the contract, with delays triggering proportional encashment of performance bank guarantees. If round-trip efficiency drops below 70%, the monthly tariff will be forfeited. Sustained availability below 50% for two consecutive years will be treated as an event of default, leading to termination of the storage purchase agreement.