This goal has to do with all things infrastructure. It is crucial to achieving sustainable development and empowering communities in many countries. It also most directly wants to "Build resilient infrastructure, promote sustainable industrialization and foster innovation" (UN Sustainable Development Goals)
Providing light to developing nations would have many positive impacts in regards to Industry, Innovation, and Infrastructure. By not having a steady form of energy it makes many stores vulnerable and prohibits them from reaching their full potential. By giving people access to panels it increases productively which helps the country as a whole.
Fact: Around 30 countries experience regular power shortages which costs those countries economies on average 2%- 5% off there GDP, therefore without these setbacks they would be better off.