Johannesburg, South Africa’s biggest city, with a population of over 5 million people, wants to meet 35% of its energy needs from renewable sources by 2030 and will seek proposals for privately supplied power by August after the government last year said municipalities could buy electricity from companies other than state power utility Eskom. In addition to renewable energy sources such as solar energy and biogas from landfills, the city is also considering the use of hydrogen fuel-cells and natural gas, and has said it is open to discussions with any company that thinks it will be able to supply power.