Professor Ryszard Bartnik is a power engineering researcher and scientist. His fields of specialization are heat and power generating technologies and power management. He is interested in the technical and economic effects of coal fired and natural gas fired heat and power generating plants. After having worked at the Silesian University of Technology as academic teacher and at design offices, he currently is professor at the Opole University of Technology. He is still interested in technical and economical problems of power plants and publishing connected with these problems some new articles as well as a new and very interesting book not only in Poland. He is the author and co-author of 7 books, among them "Conversion of Coal-Fired Power Plants to Cogeneration and Combined-Cycle. Thermal and Economic Effectiveness”, Springer, London 2011, “The Modernization Potential of Gas Turbines in the Coal-Fired Power Industry. Thermal and Economic Effectiveness”, Springer, London 2013, “Combined cycle power plants. Thermal and economic effectiveness” WNT, Warszawa 2009, 2012, (in Polish), Economic Account in the Power Industry, Wydawnictwo WNT, Warszawa 2014 (in Polish).M. Sc. Berenika Bartnik is a researcher for the field of economic engineering. She works in Trigon brokerage house and has a practical knowledge about financials and mathematics. She is co-author of several articles in the fields of economical effectiveness in power industry. She is also co-author of the monograph "Economic Account in the Power Industry", Wydawnictwo WNT, Warszawa 2014 (in Polish).Dr eng. Anna Hnydiuk-Stefan work as a university teacher in Opole University of Technology. She has experience in co-operation with the biggest Polish power groups in a field of carbon emissions trading scheme. She is an author of several publications about oxy-fuel combustion technology and environmental charges impact on a powerplants operation. She is a graduate of the MBA in finance and insurance conducted by the Illinois State University and Technical University of Lodz. She is a licensed commodity broker No. 247 issued by the Financial Supervision Commission in Poland

• Introduction.- A formulate of problem of seeking an optimum investment strategy in power engineering.- Value of the heat and electricity market and market worth of power stations and heat and power plants supplying the market.