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Interesting piece on decommissioning cost of wind power turbines in order to upgrade for last decades of tech progress at end of plant life: http://finance.yahoo.com/news/germany-now-faced-thousands-aging-220356991.html

For PV this process should be much simpler. Just replace the panels with newer more efficient ones.

 

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A bit old now but this article is really interesting.

PERC mono-Si PV modules to cost lower than poly-Si ones in 2017, says LONGi president: http://digitimes.com/news/a20151015PD205.html

Google title to get access.

With narrowing price difference per piece and widening performance difference per piece it looks like mono could make a massive comeback second half of this decade after multi dominance in the first half.

 

While prices for polysilicon have remained stably at US$15/kg since 2013, prices for solar-grade poly-Si wafers have also stayed at about US$0.82 but those for mono-Si ones have dropped from US$1.15 in 2013 to US$0.94 currently, Li said during PV Taiwan 2015. The three-day event runs till October 16.

 

Power output for a PV module made of 60 mono-Si cells was higher than that for a PV module with 60 poly-Si ones by 10W in 2013, and the gap has increased to 15W currently and is expected to further rise to 20W in 2017 due to application of PERC technology

 

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