Nigeria power shortages strain businesses, public services

IBADAN, Nigeria - Dimly lit and stuffy classrooms stir with life every morning as children file in. Rays of sunlight stream through wooden windows, the only source of light. Pupils squint at their books and intermittently the blackboard as teachers try to hold their attention.

It's a reality for many schoolchildren across Nigeria, where many buildings don't have access to the national electricity grid. In Excelle