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The milk cooler looks great and seems like a very useful technology for dairy farmers. It is indeed difficult for a lot of farmers to bring cooled evening milk into the market and as a consequence quality of milk is compromised. Also income is missed.  Before I make a comment on how to upscale the milk cooler I like to have a few questions answered: how much biogas (liters per day or litres per litre of milk cooled) is required for cooling 2-10 liters of milk; what is the minimum amount of cow dung required to generate that amount of gas and what size biogas digester is needed for that;  does the farmer has addtional needs for the biogas besides using the biogas for the milk cooler, what are the investment cost for a dairy farmers and what are the assumed maintenance cost, how maintenance free is the technology itself, does it require regular service, how robust is the milk cooler, how much extra income (USD/litre milk) will the dairy farmers get when offering cooled milk to the market, what is the average travel time from the dairy farmer homestead to the to the collection centers, how is the quality of milk being tested when receiving the milk at the milk collection centres?