Fewer than 16% of Ethiopians are connected to the national electricity grid. Many cook on firewood, charcoal and dung and die of indoor pollution. As this East African economy grows by leaps and bounds, the demand for energy is on the rise, too. The Ethiopian government plans to meet this need by harnessing the Omo River and building a hydropower dam. Lord Aikins Adusei finds the drawbacks in the project. The Omo River Valley in south-western Ethiopia is home to more than a dozen tribes that have lived there for centuries and depend on its annual floods for their livelihood.…