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Comparison between the costs of utilization of energy efficiency reserves in thermal power plants and heating plants and the costs of construction of new energy sources

Jędral W.

Journal of Power Technologies

2012

Vol. 92, nr 3

174--182

The paper presents the possibilities of decreasing electric energy consumption for auxiliary on-site needs in thermal power plants and combined heat and power plants by increasing energy efficiency of boiler feed water and cooling water pumping. Significant benefits can also be achieved by utilization of energy efficiency potential in circulating water systems in combined heat and power plants and heating plants. A comparison between energy and economic effects of modernization of pumping systems and unit costs of new energy sources is also made. It is shown that even highly expensive modernizations are twice less costly than the investment in the most economical energy source, i.e. the gas power plant. It is shown that, when considering construction costs of new energy sources, one should take into account their capacity factors by determining equivalent capital costs of the source referred to its continuous work in a year period, i.e. during 8 760 hrs. In these terms, photovoltaic and wind power plants turn out to be much more expensive than nuclear power plants.