For more than a decade, one 48-year-old entrepreneur in Ghana has been quietly building up a multimillion-dollar oil and gas outfit called UBI Group. Salma Okonkwo is a rare woman to head up an energy company in Africa. “I don’t stop when the door is being shut. I find a way to make it work,” Okonkwo told Forbes. “That’s what propelled my success.” She’s now expanding her reach across Ghana’s energy industry, working on an independent side project that may become the biggest in her career. Okonkwo is building Ghana’s biggest solar farm, called Blue Power Energy, slated to open in March 2019 with 100 megawatts of energy. It’s set to be one of the largest in Africa.