without these investments one billion people will still be without access to energy by iea id principally in subsaharan africa ssa yet by the time of the rio summit in the energy access funding commitments received by the un secretarygeneral were only equivalent to around of the nearly usd trillion in cumulative investment needs iea a sustaining growth in emerging markets will also require even more substantial investment in energy infrastructure by emerging economies are expected to account for nearly of total global gdp leading to a considerable expansion in energy demand oecd b