Without these investments, one billion people will still be without access to energy by 2030 (IEA, 201 Id), principally in Sub-Saharan Africa (SSA). Yet by the time of the Rio+20 Summit in 2012, the energy access funding commitments received by the UN Secretary-General were only equivalent to around 3% of the nearly USD 1 trillion in cumulative investment needs (IEA, 2012a). Sustaining growth in emerging markets will also require even more substantial investment in energy infrastructure. By 2050, emerging economies are expected to account for nearly 40% of total global GDP, leading to a considerable expansion in energy demand (OECD, 2012b).