NAIROBI, KENYA — Some companies are coming up with creative ways of making electric vehicles a more realistic option in power-challenged areas of Africa. Countries in Africa have been slow adopters of battery-powered vehicles because finding reliable sources of electricity is a challenge in many places. The Center for Strategic and International Studies described Africa as “the most energy-deficient continent in the world” and said that any progress made in electricity access in the last five years has been reversed by the pandemic and population growth. Onesmus Otieno, for one, regrets trading in his diesel-powered motor bike for an electric