Image copyright Uganda Electricity Transmission

A huge floating island in Lake Victoria triggered a nationwide blackout in Uganda after clogging a turbine in a hydroelectric power station.

"It was at least two acres, almost two football size pitches," an official, Simon Kasyate, told the BBC.

The outage caused a broadcast by President Yoweri Museveni on the Covid-19 crisis to be delayed by an hour.

Lake Victoria, shared by three East African countries, has for decades been invaded by water hyacinth.

The huge mass of vegetation choked the turbines of Nalubaale Hydro Power Station, causing widespread disruption, power utility company Eskom Uganda said in a statement.

The company said that "current rising water levels" of the lake could be behind the movement of the floating island.

The water level in the lake is currently at 13.12m, almost reaching the record high of 13.46m seen in 1964, said Mr Kasyate, a spokesman for Uganda Electricity Transmission.

It is usually between seven and 9m, he said.

Heavy rain, clogging of the lake's tributaries and pollution could also explain the island's movement.

He added that electricity was finally restored but workers were still chopping off parts of the floating island.

"We have always managed to manually deal with this plant, this one was unprecedented," said Mr Kasyate.

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