The European Commission has initiated a formal investigation into potential aid granted to large and medium-sized companies in France in the form of artificially low regulated electricity tariffs. The system appears to be administered by the State and financed mainly by the State-owned company Electricité de France and by parafiscal contributions levied on all French electricity consumers. The Commission is concerned in particular with the so-called "green" and "blue" tariffs, which are the lowest ones and applicable to medium and large companies. The competition problems raised by artificially low State-regulated tariffs were highlighted by the Commission in its energy sector inquiry published at the beginning of the year. Interested parties will have the opportunity to submit comments.