“…However, it is possible to identify the main application fields. Among the most relevant areas highlighted by the performed literature review the following ones can be mentioned: Energy power systems: capacitors placement problems (Araújo et al, 2011), energy transmission and distribution optimisation (Ekel et al, 1999) energy planning (Beccali et al, 1998;Kaya et al, 2011), selection of alternative energy sources (Barin et al, 2010), selection of trigeneration systems (Nieto Morote et al, 2011), design and control of power systems (Ekel and Popov, 1995), and selection of renewable energy alternatives (Kahraman et al, 2009). Facility location selection: see Section 2.2.…”