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Blackouts that left half of India’s population without electricity show power networks are vulnerable, New Zealand and U.S. regulators said.

A series of failures and excessive demand on the national grid knocked out power for 640 million people in northern and central India on July 31, a day after a separate blackout left 360 million in seven states without lights. A three-member committee appointed by India’s government is investigating.

“Blackouts like that and cascading failures can occur and we have seen them occur in other countries,” Carl Hansen, chief executive of New Zealand’s Electricity Authority, said in an interview. “It is something that is constantly on the mind of grid planners.”