This thesis has for object to answer the following question : is a choice of public utility compatible with a choice of financial order, because bringing in financial criteria, among which that of financial profitability ? It takes place in a context of deep changes of the public sector. Taking as theoretical frame the New Public Management, noticing an appropriation by the administrative law of the notions of financial interest and profitability, this exploratory research goes on by interviews with elected representatives and administration staff of 26 municipalities. It shows a weight of the financial criteria close to that of the criteria of public utility and a clear interest for a tool of financial profitability calculation, answering ...