You'd be surprised at the places that have electricity, like houses in middle of nowhere, central asia. One of the challenges with engineering technology for the global south is that poverty is wildly different for different people. I met a professor working on flatpack windmills to pump water/electricity. The major challenges he kept seeing in the the Andes weren't the sorts of longevity/efficiency/logistics issues we usually solve with standard engineering, but how the products interacted with local politics and society.