N2 - The paper covers problems of the owners of a fleet of long-operated conventional power plants that are going to be decommissioned soon in result of failing to achieve new admissible emissions levels or exceeding pressure elements design lifetime. Energoprojekt-Katowice SA, Siemens AG and Rafako SA presents their joint concept of the solution which is a 2on1 concept – replacing two unit by two ultra-supercritical boilers feeding one turbine. Polish market has been taken as an example. L1 - http://www.czasopisma.pan.pl/Content/105655/PDF/10_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/105655 PY - 2017 IS - No 4 EP - 190 DO - 10.1515/aoter-2017-0030 KW - coal fired power plant KW - flexibility increasing KW - old units replacement A1 - Grzeszczak, Jan A1 - Grela, Łukasz A1 - Achter, Thomas PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2017 T1 - Environmentally Friendly Replacement of Mature 200 MW Coal-Fired Power Blocks with 2 Boilers Working on One 500 MW Class Steam Turbine Generator (2on1 Unit Concept) SP - 165 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/105655 T2 - Archives of Thermodynamics