Sri Lanka was hit by a nationwide electricity blackout on Saturday after its national grid tripped, officials said, prompting the state power distributor to ask rooftop solar owners to disconnect their systems.

The country was without grid power for more than two hours, with no clear timeline for full restoration, the state-run distributor Electricity Distribution Lanka said. Engineers were working to repair a fault affecting the entire grid.

Energy Minister Anura Karunathilaka said authorities hoped to restore supplies "stage by stage". "We request rooftop solar system owners to disconnect their systems until further instructions in order to support the restoration efforts," he said in a brief statement.

Officials suspected that excess solar power generation may have caused the breakdown. Sri Lanka has installed solar capacity of just over 3,000 megawatts, while daytime demand runs between 2,000 and 2,500 megawatts. Tax concessions have encouraged consumers to install solar panels and sell surplus electricity to the grid, creating imbalances the utility has struggled to manage.

The government aims to lift solar generation capacity to nearly 4,400 megawatts within three years, a 388 per cent increase from 2024.

It is not the first such failure. The entire grid shut down in February 2025, when solar generation exceeded consumption on a bright Sunday, and it took more than six hours to restore supplies.