Larger PV Glass Furnaces Put Electric Melting Configurations to a New Test

In 2026, installed demand for PV modules continues to drive expansion of PV glass capacity, and the single-line scale and furnace tonnage of new plants keep rising, with furnaces of a thousand tonnes per day and above becoming the mainstream configuration. While upscaling spreads unit costs thinner, it also pushes every link of the melting system to a new operating boundary, and electric melting configuration is the first to feel it.

Power and heat in large furnaces

PV glass furnaces generally use combined flame and electric melting: electric boosting electrodes are arranged in the melting and refining sections, and a fully insulated furnace body cuts heat loss. Upscaling brings two direct changes. First, total electric power in the melting section rises, and both the number of electrodes and the load on each one increase. Second, the furnace campaign is being extended, and owners increasingly prefer minimal or no electrode disturbance across the whole campaign, which raises the bar on electrode life.

• Power density: current per electrode rises in large-tonnage furnaces, and structural defects are magnified into hot-spot risk;
• Life matching: replacement windows narrow, and electrode life must be re-aligned with the campaign cycle;
• Batch sensitivity: low-iron batches have different conductivity behavior, so electrode layout must be designed for the specific batch;
• Interface safety: through-wall water cooling and the furnace lining structure carry higher thermal load at high power.

The technical response for molybdenum electrodes

Under the new duty conditions, electrode manufacturing is concentrating on three points: improving the density and uniformity of large-format billets to cut the probability of local overheating at the source; optimizing the end and water-cooling structures to hold the line on interface reliability; and building configuration calculation capability customized to furnace type so that current density distribution matches glass melt flow. Industry practice also shows that electrode problems in PV glass furnaces are rarely single-point failures; they are the cumulative result of design, manufacturing and operation, and supply and demand must manage them together.

Outlook

The PV glass industry went through rapid capacity release and price volatility in 2026, but the technical direction of upscaling and electrification has not changed. As the penetration of double-glass modules rises, PV glass will set even higher demands on melting quality and energy consumption. As the main conductive material of electric boosting systems, electrodes will have their upgrade pace tied closely to this track: whoever can adapt to the long campaign duty of kiloton-class furnaces will gain the inside position on supporting the next expansion wave. For electrode suppliers, the opportunity lies in engaging earlier, checking electrode configuration against the power supply system together with owners and engineering firms from the furnace design stage, and using full-life electrode data to help PV glass furnaces achieve stable long-campaign operation, so that the electrode package becomes part of the overall competitiveness of a large furnace.