[en] A first document reports the synthesis of the follow-up of 10 methanization installations. After a presentation of objectives and stakes, of the adopted methodology, of the installations, it describes the follow-up process (instrumentation, agenda, main faced difficulties), reports an assessment of the operation (storage and preparation of input materials, digestion, energy valorisation and assessment, digestate valorisation), a social and environmental assessment (environmental impact, commissioner's organisation), and an economic assessment (investment and funding, operating accounts, profitability indicators, prospective). A synthetic note contains a synthetic version of this first report. The third document reports a study of gas flow-metering by reporting measured data and implemented technologies, and by proposing a return on experience which addresses the proper use of instruments, the lack of instruments, the installation of instruments according to recommendations, and flow-meter types. Synthetic and detailed reports are then provided for each of the 10 concerned installations. The synthetic sheets present the local context, the general operation, data about substrates, a synthetic technical description, data illustrating operational, energy, social and environmental, and economic assessments, and identification of strengths and weaknesses, opportunities and threats for the installation. The detailed reports develop these various aspects