What Superman won't tell us, we're figuring out on our own. Sunpower makes the most efficient solar cells on earth and their doing it cheaper every year. While a lot of research has gone into alternative methods for creating solar cells (concentrators and thin films particularly) traditional silicon wafer cells have gotten much cheaper and are completely in control of the solar power market.
Next year, Dr. Swanson proudly proclaims, the solar industry will consume more tons of silicon than the electronics industry. Considering that creating silicon wafers is a ridiculously dirty process requiring enormous refineries, he probably shouldn't be so proud. But it's good to see the industry in such good health and growing.