Where biogas projects are concerned, a comprehensive analysis is often critical for lending strategies, as the investment risks involved must be made transparent before the project can be financed. This applies equally to the construction of new biogas plants and to the expansion or modification and modernisation of existing ones. A technical due diligence review offers a suitable tool for presenting data on profitability, systems and installations and energy and material flows. This information is of interest not only to potential investors. Owners and operators of biogas plants also benefit from a detailed assessment of investment risks, realistic calculations of yield and revenue and the examination of issues related to systems, installations and safety.