To meet Europe’s 2030 climate targets the buildings sector must cut its emissions by 60%. That means annual renovations need to jump by an order of magnitude; at the moment it’s crawling at 1% per year. Worse, standard renovations save very little energy, just 9% in homes and 16% in commercial buildings. It’s the deep renovations that cut energy by 60% or more, but that’s only happening to under 0.3% of the stock. Louise Sunderland at RAP … [Read more...]
Buildings Renovation in Germany: success story or potential failure?
The German Federal Association of Housing and Real Estate Companies (GdW) has claimed that money and effort spent on the nation’s buildings renovations have not worked. But Andreas Rüdinger at IDDRI has looked into the evidence and concluded that the opposite is the case. CO2 emissions from the residential sector in 2018 were 37% lower than in 1990. Though final energy consumption was broadly stable, that’s because efficiency gains were offset by … [Read more...]
Distributed Solar: rooftop residential, commercial systems keep getting cheaper
In the U.S., PV module efficiency (median values) rose from 12.7% in 2002 to 18.4% in 2018, much of it in the last decade and a full percentage-point increase in the last year alone. The best modules are even more efficient, says John Rogers at the Union of Concerned Scientists. Improvements have come from manufacturing processes and cell architectures, and the increasing share of more-efficient mono-crystalline technologies: up from 40% in 2016 … [Read more...]
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