In the work the comparative analysis of perspective directions of energy supply systems efficiency increase on the base of low-power co-generation units is executed, and rational thermal schemes of different configurations ESIS are offered

The author's analysis for substantiation of the criteria and methods of complex thermodynamic estimation, economic and ecological efficiency of integrated systems are carried out. Principles of construction of the mathematical models of ESIS is formulated, and mathematical models of its components combined with the alternative sources of energy with different variants of configurations, types of the systems, energy sources and modes of consumption of power products are executed.

In the work the method of alignment the thermal and electric loads charts of ESIS depending on power potential of additional sources energy and thermal accumulation properties of system’s elements is offered. The exergoeconomic method of efficiency analysis of systems and of energytransformation elements for optimization of the ESIS thermal schemes parameters is used. The method of optimum structure choice of ESIS thermal schemes is developed.

The conclusion for increasing thermodynamic, economic and ecological efficiency of integrated systems based on comparing of co-generation systems combined with additional sources of heat and possibilities of limitations removal, that energy supply characteristic of the systems based on co-generation units and co-generation units with alternative sources of heat are made.

The information for preliminary efficiency rise on the real objects is resulted.

Keywords: integrated system of energy supply, co-generation unit, efficiency, complex optimization, modes of loads.