Energy generation from waste in Nigeria?

I was recently invited to Nigeria as guest speaker at the yearly meeting of Nigerian Academy of Engineering, which is a well respected organization in the country. The topic of my presentation was about energy generation from wastes. This country with 150 million people is the most poplulated and relatively rich country in Africa. However, they suffer from shortage of electricity production with a total production of about 4000 MW as I heard. However, a rough calculation shows that if they put effort to convert their waste to electricity via landfill gas, biogas and/or incineration, they can produce about 1,000-5,000 MW electricity from their wastes, depending on the technology used.

(Landfill site in Lagos, a megacity with more than 15 millon inhabitant)