Biogas is not yet listed in the energy mix in Nigeria. However, a
research conducted in Ref. [50], shows that a 6.0 m3 of family-sized
biogas digester can generate 2.7 m3 of biogas/day to satisfy the
cooking need of a family composed of 9 persons. The project was
estimated to have an initial cost of US $500 (equivalent to Nigerian
Naira (NGN) 80,100), annual expenditure of NGN 11,200 and an
annual benefit of NGN 25,600 [50]. Although the financial analysis of
the project suggests that it has a good economic potential, its initial
cost may make it unaffordable to majority of its intended users – the
low income earners (mostly rural dwellers). Unless some measures
are taken to bring down the capital cost or economically aid its
targeted users, the objective of making biogas to penetrate into the
low-income households may be, ultimately, defeated [47].