“…Noticeable, the distributions of the considered aggregations of the wind power index have similar characteristics as those of wind speed data in existing studies (e.g., Brown and Murphy, 1984;Bivona, Bonanno, Burlon, Gurrera, and Leone, 2011;Alexandridis and Zapranis, 2013). In the literature, several distributions have been fitted to average hourly wind speed data, including the gamma distribution (Sherlock, 1951), the inverse Gaussian distribution (Bardsley, 1980), the squared normal distribution (Carlin and Haslett, 1982), lognormal distributions (Luna and Church, 1974;Torres and De Francisco, 1998), the Chi-square (Dorvlo, 2002), and the Weibull distribution (Hennessey, 1978;Brown, Katz, and Murphy, 1984;Akpinar and Akpinar, 2005;Torres, Garcia, De Blas, and De Francisco, 2005;Bivona, Bonanno, Burlon, Gurrera, and Leone, 2011, among others).…”