Glass melting process with low co2 emission

A process for melting vitrifiable materials to produce flat glass, comprising:

• providing a furnace comprising at least one main melting tank comprising an electrical heater, at least one auxiliary melting tank, a fining tank provided with an oxy-combustion burner, at least one neck separating the at least one main melting tank and the fining tank, an inlet located at the at least one main melting tank, and an outlet located downstream of the fining tank;
• charging vitrifiable materials, comprising raw materials, in the at least one main melting tank;
• charging cullet in the at least one auxiliary melting tank;
• melting the charged vitrifiable materials in the at least one main melting tank by heating with the electrical heater to form primary melt, and flowing the primary melt to the fining tank through the at least one neck;
• melting the charged cullet in the at least one auxiliary melting tank, to form cullet melt;
• flowing the cullet melt from the at least one auxiliary melting tank to the at least one neck or to the fining tank;
• fining the primary melt in the fining tank by heating with the oxy-combustion burner, the fining being alimented with gas and/or hydrogen;
• and
• flowing the primary melt from the fining tank to a working zone through the outlet, wherein
• a total amount of cullet is at least 10%, by weight, of a total amount of vitrifiable materials, and
• an electrical input fraction of the furnace ranges from 50% to 85%.