In early 2012 the French government created a tender intended to find an issuing body for French Guarantees of Origin. As of January 15th 2013 it was made public that Powernext will be the next issuing body.
The decree also presented the fee structure mandating a 1 euro cent fee for transfers, imports, exports and cancelations per certificate and a 3 euro cent fee for issuance per certificate. The issuing body is expected to be operational by May 1 and is speculated to begin international transfers and trades of GOs shortly thereafter.
You can find the official French text here