SEE-Clean Cooking: Support to the WCA Alliance for the African Biodigester Component (ABC) The West and Central African Alliance (WCA Alliance) for biodigesters is an initiative of eight African Heads of State and governments to accelerate biodigester uptake in the region. The WCA Alliance advises its member states on the conditions required for their biodigester markets to flourish.Hivos, as the WCA Alliance Support Implementer for the African Biodigester Component (ABC) programme, provides support to the Alliance and its member governments to carry out their mandate.