1. Introduction 2. Selection of Optimal Heating Structures for Modernization of Coal-Fired Power Stations to Cogeneration 3. Mathematical Model of a Power Unit with Rated Capacity of 370 MW After Its Modernization to Cogeneration and Combined-Cycle 4. Algorithm for the Calculation of an Optimum Structure of Heat Exchangers for the Modernization of a 370 MW Power Unit to Combined Heat and Power Cycle. 5. Testing Calculations of the Mathematical Model of a Power Unit 6. Thermodynamic Analysis of a Combined Heat and Power Unit Using Extractions A2, A3 and Crossoverpipe IP-LP for Heater Supply 7. Economic Efficiency of a Power Unit Adapted to Cogeneration 8. Technical and Economical Effectiveness of Modernization 370 MW Power Unit Repowered by Gas Turbine with Their Modernization to Cogeneration 9. Technical and Economical Effectiveness of 370 MW Power Unit Repowered by Gas Turbine in Parallel System 10. Summary and Final Conclusions