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[QUOTE]Originally posted by tropicals redacted: [QB] Solar Power "Net-energy calculations for photovoltaics are a matter of some controversy. Clearly, conventional silicon-crystal cells have so far had a relatively low return for the energy invested in their manufacture, even though promoters of the technology staunchly claim a favourable figure (typically, they exclude from their analyses the energy expended in transportation as well as that embodied in production facilities). In this instance at least, net-energy payback appears to be highly sensitive to the volume of production: PV modules are still manufactured on a very small scale; if demand were to rise very noticeably. It is likely that, even if the most pessimistic assessments of silicon-crystal cells - which suggest a current net return of less than 1:1 - are correct, the newer thin-film and DSC technologies may be able to achieve a substantially more favourable EROEI [Energy Returned On Energy Invested] (the more optimistic assessments of silicon-crystal cells suggest a current net return of roughly 10). At some point the net energy available from PV electricity will overtake the EROEI that can be derived from petroleum, as the latter is depleted. Thus the commercial development and implementation of new PV technologies will have to move at breakneck speed to stay ahead of the net energy decline from post-production-peak petroleum. Solar photovoltaic and thermal-electrical technologies present us once again with the problem we noted concerning nuclear power and wind: electricity cannot easily be made to power our current transportation and agriculture infrastructure. What is needed is some efficient medium for storing electrical energy that also renders that energy transportable and capable of efficiently moving large vehicles" (pp145-146). [/QB][/QUOTE]
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