South Africa and the Democratic Republic of Congo have signed nearly 40 trade agreements including one to revive a hydroelectric scheme.
South African President Cyril Ramaphosa signed the agreements with his counterpart Felix Tshisekedi in the Congolese capital, Kinshasa, BBC has reported.
The Grand Inga Dam project is a series of seven proposed hydroelectric power stations across the Congo river.
If built as planned, it would be the largest of its kind in the world.
South Africa is experiencing a massive electricity crisis with frequent power cuts.
“The DRC has an equally important role to play in the future of our continent, with its minerals propelling the new green industrial revolution,” Cyril Ramaphosa.