( CNN ) -- President Barack Obama concluded his trip to Africa Tuesday after making a final pitch for partnership at a Tanzanian power plant . Some 70 % of Africans lack access to reliable electricity , Obama said , and the United States can help bring more power on line . `` The first step that we 're going to take is to try to bring electricity to 20 million homes and businesses , '' he said . The president spoke at the Symbion Power Plant at Ubungo , was had been idle until the Tanzanian government used U.S. help to revamp it . `` This is just the beginning . We look forward to even more companies joining this effort , '' he said . Such partnerships create more jobs and exports in the United States , he said . Before his remarks , Obama kicked around an energy-generating soccer ball that harnesses kinetic energy to provide power . Obama challenges students to follow Mandela legacy . `` I do n't want to get too technical , but I thought it was pretty cool , '' Obama said . Also Tuesday , Obama was joined by former President George W. Bush for a wreath-laying ceremony at the U.S. Embassy in Dar es Salaam , the site of a 1998 terror attack that killed 10 Tanzanians and injured more than 85 Americans and Tanzanians . Survivors of the bombing were present as Obama and Bush stood by the wreath at a memorial that is on a piece of rock under a big tree near the entrance to the embassy . Obama was in Africa to promote an increased partnership amid criticism the United States has , outside of military interests , focused its attention on other areas of the world . The three-nation trip began last week and included stops in Senegal , South Africa and Tanzania .
In Obama 's last stop on an African visit , he pushes for partnerships on energy . He also attended a wreath-laying ceremony with former President George W. Bush . Comment: