  The One Sun One World One Grid (OSOWOG) initiative advocates the development
of a global Super grid for sharing renewable energy, especially solar energy.
This study evaluates the economic benefits of such a Super grid, which connects
six large regions spanning from Australia to the US, utilizing a detailed
energy system optimization model and considering heterogeneous discount rates
among countries. Integrating the six regions into a Super grid reduces the
electricity system cost by 3.8% compared to isolating them. In contrast, grid
expansion within each region reduces the electricity system cost by 12% on
average. The economic benefits of the OSOWOG initiative's global Super grid
expansion seem to be rather limited. Moreover, the allowance for a Super grid
consistently results in decreased investments in solar power, indicating that
it is not an effective strategy for enhancing the deployment of solar power,
even when transmission grids covering 18 time zones are available.
