Dear all
The Ecostock proceedings is now available online. You find it at http://intraweb.stockton.edu/eyos/page.cfm?siteID=82&pageID=29
From these papers, I assume, you are able to find the status for the thermal storage technologies. I will probably try to find time to study the papers and review the status in a paper myself.
Good reading.
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Here is a list of where to find (or not) on-line proceedings of other past ECES conferences, and related conferences. Unfortunately most are lost to the web. There are on-line proceedings for 4-1/2 of them, and tables or contents for 3-1/2 others. For two there are no longer any materials (TOC or program) on the web anymore.
1981: International conference on seasonal thermal energy storage and compressed air energy storage. TOC of Vol 1, proceedings: (http://www.gbv.de/dms/tib-ub-hannover/125239793.pdf)
1981: International conference on seasonal thermal energy storage and compressed air energy storage. TOC of Vol 2, proceedings: (http://www.gbv.de/dms/tib-ub-hannover/125239823.pdf)
Enerstock 1985 Proceedings (ftp://ftp.tech-env.com/pub/energy/atesstes/enerstock85.pdf)
Jigastock 88 — TOC, Vol.1 of proceedings (https://getinfo.de/app/Jigastock-88-communications-proceedings-18-21-octobre/id/TIBKAT%3A180852787 )
Jigastock 88 — TOC, Vol.2 of proceedings (ftp://ftp.tech-env.com/pub/energy/atesstes/jigastock88.pdf)
Thermastock 91 Proceedings (ftp://ftp.tech-env.com/pub/energy/atesstes/thermastock91.pdf)
Calorstock 94 — TOC (ftp://ftp.tech-env.com/Fpub/Fenergy/Fatesstes/Fproc_4papers.pdf)
Megastock 97 — (nothing available)
1998: Second Stockton International Geothermal Conference. March 16 and 17. Proceedings: (http://intraweb.stockton.edu/eyos/page.cfm?siteID=82&pageID=14)
Terrastock 2000 — TOC, Vol.1 (F:-Clima-Sci\Terrastock_2000__list of lectures.pdf)
Terrastock 2000 Proceedings, Vol.2 (http://nashaucheba.ru/v9143/?download=1)
Futurestock 2003 — (website disappeared; I have a pdf of the program).
Ecostock 2006 Proceedings (http://intraweb.stockton.edu/eyos/page.cfm?siteID=82&pageID=29)
Effstock 2009 Proceedings (http://intraweb.stockton.edu/eyos/page.cfm?siteID=82&pageID=41#34)
Innostock 2013 (website disappeared; proceedings only privately distributed).
IEA-ECES Conferences webpage: (http://www.iea-eces.org/eces/stock-conferences.html).
STES Newsletter, 1978-1993: (ftp://ftp.tech-env.com/pub/ENERGY/STES/Newslett)
STES Newsletter Index: (ftp://ftp.tech-env.com/pub/ENERGY/STES/index.pdf)
I also note that ECES annexes are not up-to-date on the ECES website, and there are lots of dead links among the completed annexes.