Sigma Journal of Engineering and Natural Sciences, vol.27, pp.60-82, 2009 (National Refreed University Journal)
Usage of Renewable Energy Sources, means saving money in terms of “energy economy”, defeats risks of
energy supply lack in terms of “sustainability” and means to be indipendent in terms of “politics and national
Wind, Solar and Geothermal energy sources to be used alone, also they can be united as a Hybrid Renewable
Energy System (BYES).
In this study, necessity and utilization of Wind, Solar and Geothermal energy sources discussed and attracted
attention to research on Renewable Energy Resources. Also given information about research on BYES.
BYES applications can be classified such as; bivalent systems, trivalent systems and multivalent systems
which will use four and more Renewable Energy Sources together.
As a contribution for the literature on new “multivalent systems”, research on “Yildiz Renewable Energy
House Project” continuing; aiming to find optimum proportion of Renewable Enegy Sources which are
components of a “multivalent BYES” according to regional climatic conditions.
A realization of combining trend of renewable energy sources occuring which is a necessity for the