WARSAW (Reuters) - Making Poland’s 1 GW power plant in Ostroleka gas-fired instead of coal-fuelled as planned may delay the project beyond 2023, Poland’s minister responsible for energy infrastructure Piotr Naimski said on Tuesday. FILE PHOTO: Belchatow Power Station, Europe's largest coal-fired power plant operated by PGE Group, is pictured near Belchatow, September 12, 2018.