In many regions of the world, insolation and wind regimes are fairly complementary over the year. If an integrated approach consisting of PV, wind energy systems, and other options such as biomass and hydro is pursued, then there is a significant potential for reducing the amount of energy storage required and the overall cost. Various aspects of such systems, called IRES (for Integrated Renewable Energy Systems), have been discussed in the literature [5], [6].collected.