This paper presents two market dependent optimization algorithms that can be used to plan wind energy conversion system (WECS) installations simultaneously over several sites of interest to a utility, within the scope of 1) available WECS models, 2) power demand of the utility, and 3) wind characteristics at each site; both 2) and 3) being variable with time and subject to seasonal changes. A suitable case study illustrates application of the planning algorithms to a scenario comprising of eight installation sites, using a representative market database consisting of 37 available models of WECS.