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).

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. [ABSTRACT FROM AUTHOR]