Technology uptake is driven by hous

Technology uptake is driven by household income. Households with higher income levels were expected to adopt biogas technology more readily than their poorer counterparts. House- hold income was thus expected to carry a positive sign. The cost of major traditional fuels for cooking and lighting purposes, such as fuelwood and kerosene, was expected to be positively correlated with the probability of adopting biogas energy. Evidence from similar adoption studies indicates that the biogas digester is more attractive when the local equivalent energy price is high and the new technology has good characteristics such as high efficiency and ease of management (Ji-Quin and Nyns, 1996). Both variables are thus expected to have positive signs. Explanatory variables used in the model with their a priori signs are presented in Table 2.