Energy balanceEnergy balance is the basis of energy savingEnergy saving in aluminum electrolysisAluminum electrolysis. A smelterSmelter has realized energy savingEnergy saving by conducting systematic research on energy balanceEnergy balance while reducing cell voltageVoltage. Low thermal conductivity materials were selected for lining materials. The lining of electrolysis cell was optimized to reduce heat dissipationHeat dissipation of the cathode zone, and the heat dissipationHeat dissipation of the anodeAnode zone was reduced by using more insulating cover hood and improving upper structure sealing insulation. The coupled thermo-electric modellingModelling showed that an optimal cell ledge profile could form after the above optimization. In production, parameters such as aluminumAluminum metalMetals level, electrolyteElectrolyte level, and superheatSuperheat were strictly controlled to ensure that the energy balanceEnergy balance design goal was achieved. The industrial test showed that energy consumptionEnergy consumption of test cell can reach 12,235 kWh/t-Al after energy balanceEnergy balance optimization, which was 492 kWh/t-Al lower than that of reference cell. The total heat dissipationHeat dissipation of test cell was 1.609 V, which was 129 mV lower than that of reference cell.