*if* is the operative word here. Energy is a ladder, places that can't reliably produce their own energy supply should use the most economical fuel supply, and its unlikely this could be better than an LNG freighter. When economic development reaches the point that those places want a longer term investment in a source of energy that's cheaper in the long term then they can commit to the higher upfront cost. The idea of a tanker carrying batteries though, I can't imagine how expensive that will be, it seems ripe for a situation where the poor are completely cut off from access and electricity is a luxury only the government and elite can afford.