The introduction of solar power systems to rural communities in East Africa is providing new business opportunities, as well as affordable and safe electricity supplies. Johari lives in the Iringa region of Tanzania. She used to work as a manual labourer, breaking rocks and selling the stones for building material. But now, after a short training course, Johari is assembling and selling small solar panels that can be used to power radios and recharge batteries for lamps and mobile phones.