A large drop in the water levels at Lake Kariba, the key supply for Zambia's hydroelectric power plants, has forced the country to begin rationing power supply.
Lake Kariba is the biggest source of power for both countries but Zimbabwe has already used up its annual water allocation to produce power and was eating into Zambia’s share.
Zambia is now restricted to producing 800MW of power and Zimbabwe 300MW daily.
Water levels have dropped to critical levels at Kariba due to successive droughts with low rainfall and excessive use of water for power generation.
Zambia says it will continue to export power despite the rationing.