Analysis of information sources in references of the Wikipedia article "List of energy storage power plants" in English language version.
10 locations – 15 systems in total – adding up to 108MW / 648MWh in total, with each system able to store energy for six hours. The total undertaking includes 12 x 4MW systems and three 20MW systems. 'virtual' description is correct in the sense that the 15 systems in 10 locations "can be controlled as a single plant. While of course they can still be controlled individually when local support to the grid is needed".
{{cite web}}: CS1 maint: numeric names: authors list (link){{cite journal}}: Cite journal requires |journal= (help){{cite journal}}: Cite journal requires |journal= (help)10 locations – 15 systems in total – adding up to 108MW / 648MWh in total, with each system able to store energy for six hours. The total undertaking includes 12 x 4MW systems and three 20MW systems. 'virtual' description is correct in the sense that the 15 systems in 10 locations "can be controlled as a single plant. While of course they can still be controlled individually when local support to the grid is needed".