  The Vietnamese Power system is expected to expand considerably in upcoming
decades. However, pathways towards higher shares of renewables ought to be
investigated. In this work, we investigate a highly renewable Vietnamese power
system by jointly optimising the expansion of renewable generation facilities
and the transmission grid. We show that in the cost-optimal case, highest
amounts of wind capacities are installed in southern Vietnam and solar
photovoltaics (PV) in central Vietnam. In addition, we show that transmission
has the potential to reduce levelised cost of electricity by approximately 10%.
