Renewable heat sources are rarely suited to the temperature requirements of modern thermal power plants. Thus, our unique opportunity is to deliver to the market power plants optimized for these unused and overlooked thermal resources utilizing Organic Rankine Cycle (ORC). The ORC is similar to the cycle of a conventional steam turbine, except for the fluid that drives the turbine – a high molecular mass organic fluid, usually Freon or another low-boiling fluid. This paper analyzes micro combined heat and power plants (micro CHP) operating on ORC, which aims to replace conventional boilers in homes. The heat power of micro CHP is in the range of from ten to a hundred kilowatts, and electric power in the range of from a few to tens of kilowatts. Analysis concerns selection of a cycle, calculation of thermodynamic parameters, and determination of basic dimensions of heat exchangers: condenser and evaporator.