Earlier quoted context omitted.
Sure and that’s relevant because why? Let’s look at a HVDC list: https://en.wikipedia.org/wiki/List_of_HVDC_projects VS say: https://cecgis-caenergy.opendata.arcgis.com/datasets/260b451... Looks like as I said HVDC are rare. It’s ok not to be an expert on something but don’t try to fake it you just look like a fool.
Again, making shit up: The topic here is a specific installation with exactly such a "rare" HVDC transmission line.
As to the topic, if you want to bring up unrelated and experimental storage technology then don’t pretend to be “shocked” that the topic expands.