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‘If 1.5m Germans have them there must be something in it’: how balcony solar is taking off
(www.theguardian.com)
this post was submitted on 11 Feb 2025
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To be a positive impact, they just need to be less carbon intensive than the energy they displace. According to the first results on google, (presumably utility-scale) solar is about 12 times less carbon intensive than natural gas and 20 times compared to coal. So as long as you're replacing base load and not utility solar, balcony solar could be as much as 10 times less efficient and still come out a net positive.
Keep in mind also that these numbers keep improving as solar panel manufacturing becomes more efficient and starts using more green energy itself over the coming decades