OPERAT (Observatoire de la Performance Energetique de la Renovation et des Actions Tertiaires) is the official ADEME platform on which every building subject to the Decret Tertiaire must declare its annual consumption, from which compliance with the Crelat/Cabs targets is calculated.

OPERAT is the cornerstone of the French DEET scheme. The platform (operat.ademe.fr) requires mandatory annual declarations (deadline 30 September of year N+1) covering consumption per energy carrier (electricity, gas, district networks), per use where sub-metering exists, plus surface area and occupancy. The platform automatically computes target vs achievement and publishes the score for public transparency. Failure to declare triggers sanctions of roughly EUR 7,500 per entity.

Reconcile your OPERAT carrier totals with the utility bills before 30 September — discrepancies are the first thing ADEME flags.