This model has also been used in order to investigate possible evolutions of the local energy context. A first focus was given to the cost of the rice husk. Currently such a biomass is an agricultural residue and does not have any value. Farmers are used to burn it just to dispose it. Thus, it is easy to have it for free, but the rice husk is likely to assume a certain value on the local market if such a stove was to be disseminated outside the rice-farming community. Fig. 6 shows how the convenience in using rice husk as alternative domestic fuel with the technology proposed is economically sustainable until rice husk price sets at 10-15 CFA francs/kg. The trade-off threshold is about 20 CFA francs/kg. A price of 30 CFA francs/kg, that is similar to wood, would be absolutely not con-venient, as it would increase the household total energy expenditure.