Under the blazing Kenyan sun, we arrived at Naomi Adongo’s rural home, carrying our team’s solution: a complete off-grid solar system—a 16kWh battery, a 5kW inverter, and a 3kW solar panel array. I vividly remembered her mentioning life after sunset during my previous visit: dim, choking kerosene lamps and the frustration on her children’s faces as they struggled to study without light.