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The article is not peer reviewed, nor are most of the citations.Sure, the article is not peer reviewed. Neither is your comment. Dismissing the citations as mostly not peer reviewed is just disingenuous; the majority of them are from journals on energy, conferences on applied energy, and other relevant fields of research.
Using "the local gas supplier and the technicians maintaining high-pressure compressors" as an counter-argument is just as flawed, unless you're seriously claiming that they are more likely to be a source of peer reviewed knowledge about the latest developments in compressible energy storage than the work of the cited researchers.
Look, I'm not saying that this is ready for usage; the article itself ends with:
> In conclusion, small-scale compressed air energy storage could be a promising alternative to batteries, but the research is still in its early stages – the first study on small-scale CAES was published in 2010 – and new ideas will continue to shed light on how best to develop the technology. At the moment, there are no commercial products available, and setting up your own system can be quite intimidating if you are new to pneumatics. Simply getting hold of the right components and fittings is a headache, as these come in a bewildering variety and are only sold to industries.
But you're being dismissive of a technology in quick development without even engaging with the article.