The exact usage rates are little-reported, but according to our research on the topic one year ago, the old 9 milligrams per Watt (mg/W) for Mono PERC, 22 mg/W heterojunction, and 13 mg/W TOPCon had each fallen by one-third in leading research efforts, meaning the industry could operate as low as 10 mg/W today if silver became expensive enough to justify the outlay of more efficient processes ...