Flexi Biogas systems: inexpensive, renewable energy for developing countries

The most common type of biogas system, and the most widely adopted in China and India, is a fixed dome system. Its construction requires skilled technical expertise and complex logistics, making installation expensive and time-consuming. Fixed dome systems are permanent installations, so secure land tenure is a prerequisite. These challenges make it difficult to adopt fixed dome systems in developing countries, particularly in Africa. As a result, many systems have failed and adoption rates have been low.

Another type of biogas system, manufactured in Kenya, is Flexi Biogas, a flexible above- ground system that is simpler and less costly to build and operate. This system does not require agitation and the digester is not a sealed tank but simply a 6m x 3m plastic bag made of PVC tarpaulin.
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