This is update on August 10th.
Preparatory construction started in July 1st, 2018. This unit plans to start operation in November 2022. (Release from Chugoku Electric Power: http://energia.co.jp/press/2018/11218.html)
News paper mentioned it will be with biomass combustion (5%).
Yokosuka Power Plant, No.1 and No.2
On August 8th, the governor of Kanagawa prefecture submitted his openion to the second EIA screening document of Yokosuka Power Plant. (http://www.pref.kanagawa.jp/docs/ap4/cnt/f247/documents/cmschijiiken.pdf)
METI has decided to control new construction of small-scale low efficient coal power generation units. METI will officially announce their decision under energy-saving laws within this year. （from Nikkei newspaper, July 26th)