The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per arstechnica.com: "…Daimler[4] subsidiary Mercedes-Benz Energy announced a partnership with Vivint Solar to sell stationary…"
Electrek reports the groundbreaking ceremony for Daimler's[4] Kamenz battery factory, attended by Chancellor Angela Merkel, took place 22 May 2017 - about 13 months before the pin's stored 1 June 2018.
Independent corroboration of the 22 May 2017 construction-start/groundbreaking date.[1]
Daimler's own official media site documents the groundbreaking ceremony for the second Kamenz battery factory, attended by Chancellor Merkel, on 22 May 2017 - a primary company source confirming the date, more than a year ahead of the pin's stored 1 June 2018.
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