National Biodigester Programme, Cambodia
Monitoring fuel usage under the Gold Standard
The National Biodigester Programme (NBP) of Cambodia is a joint undertaking by the Ministry of Agriculture, Forestry and Fisheries (MAFF) and the Dutch Development Organisation (SNV) aiming to establish a permanent domestic biodigester sector on a commercial, market oriented basis for the dissemination of biodigesters as an indigenous, sustainable energy in Cambodia. The programme is registered under the voluntary Gold Standard and follows a Gold Standard cook stove methodology to determine the emission reductions generated through the substitution of non-renewable biomass and fossil fuels with renewable biogas.
Under the Gold Standard, fuel usage in the baseline and project scenarios need to be confirmed through the implementation of Field Tests. These tests need to be implemented at least once every two years with a representative sample of (potential) users using the 90/30 precision rule, and measure real, observed cook stove performance in the field. The Field Tests need to be carried out before verification, meaning that they can occur post-registration and once a programme is operational. For validation purposes, it is sufficient to use survey data or literature references to establish fuel usage ex-ante.
The NBP applied the Kitchen Performance Test to measure the amount of fuel that 100 households use during a period of 24 hours. While traditional improved cook stove projects tend to apply a three day measurement campaign, biogas projects can be measured in a shorter period as biogas cook stoves typically replace 90% to 100% of the baseline fuel, rather than about 20% to 30% for an improved cook stove. The test measured the amounts of firewood, charcoal and LPG used in both the baseline and project scenario. Aside from physically weighing the different fuel types, the Carbon Monitoring Survey was also implemented at households that already participate in the programme to cover additional sustainable development parameters required under the Gold Standard, including air and water quality and impact on biodiversity.