He added that steps were being taken to recover and restore the affected machines, adding that security guardrails had been put in place on customer-facing portals to prevent unauthorized access.
The Mumbai-based energy company, part of the Tata Group group, did not provide further details on the nature of the attack or when it occurred.
But in April, cybersecurity firm Recorded Future revealed an attack by China-linked attackers targeting India's power grid organization.
China deniedany allegations ofinvolvement,saying that "many of theUS allies and countries with whomwecooperate on cybersecurity are also victims of US cyberattacks."
The company further assessed that the target was either intended to facilitate the gathering of information related to critical infrastructure assets or was likely a precursor to future activity.