President Obama has wrapped up a visit to South Africa as the country focuses on the health of ailing former President Nelson Mandela. Mandela is said to remain in critical but stable condition. On Sunday, Obama unveiled a new initiative to invest in African energy called Power Africa.

President Obama: “We’re going to start by investing $7 billion in U.S. government resources. We’re going to partner with the private sector, who themselves have committed more than $9 billion in investment. And in partnership with African nations, we’re going to develop new sources of energy. We’ll reach more households, not just in cities but in villages and on farms. We’ll expand access for those who live currently off the power grid. And we’ll support clean energy to protect our planet and combat climate change. So, a light where currently there’s darkness.”

Obama spoke after touring Robben Island, site of the prison that held Nelson Mandela for 18 of his 27 years behind bars as leader of the anti-apartheid struggle. On Sunday, riot police fired rubber bullets to disperse a crowd protesting Obama’s visit in the township of Soweto. Obama now heads to Tanzania, the last stop on his three-nation African tour.