This is an update on May 7, 2020.
Since we figured out the IGCC Nakoso (Nakoso IGCC Power GK, Fukushima, 540 MW) started trial operation in late March, we updated our data.
Now, the number of units under operation (including trial operation) is 16.
Please see the web for detail. https://sekitan.jp/plant-map/en/v2