Résumé en anglais

The cleaning up costs after closure of chemical or nuclear plants are large. They have to be taken into account in the production costs and in the pricing of the corporate, owner of such plants. Moreover, it is necessary to create a reserve account to cover these future large and long term risks. The aim of this paper is to explain how the management of these financing plans can be delegated to appropriate funds, called sustainable development funds (s.d.funds). These funds would be authorized to invest on risky financial assets, but would be submitted to appropriate management restrictions and to industrial and financial risk control in order to ensure that the cleaning up is completely financed at the date of closure of the plant. We discuss the various management restrictions which can be introduced, but also the ownership transfer, when the plant is sold, the future of the fund when there is a failure of the corporate owner of the plant, or the respective roles of industrial and financial regulators.