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Back OT, I would assume the silicon wafers are the most energy intensive step in production of PV. I saw a CZ puller with a wattmeter, and it was at something like 200,000 watts. The room had 40 pullers in it. It takes days for the ingot to grow. All the while, the crucible is held at 1420 C with inert gas in the chamber, and a supercooled superconducting jacket surrounding it.
Maybe solar is only manufactured in the 200mm process, which may or may not be more energy efficient (no superconducting magnets in that process).
The monthly electric bill for the fab was something like $6M and they got electricity for $0.04/kWh + demand charge.
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