The present invention relates to a tower segment (103,200), in particular a tower segment (103,200) of a tower (102) of a wind power generation facility (100), a tower (102), in particular a tower of a wind power generation facility (100) ( 102), the method of constructing a wind power generation facility (100) and a tower (102). In particular, the present invention comprises a tower segment (103,200) of a tower of a wind power generation facility (100), in particular an upper end (212) and a lower end (214), for attachment to a support structure (112,300). A flange with a threaded opening (216) located at the lower end (210) and lower end (214), and a first flange opening (232) and a second flange opening (234) located at the lower end (214). With respect to the base with (230), the tower base element (210) and the flange (230) are connected by a fastening element (250) located in the threaded opening (216) and the first flange opening (232). The two flange openings (234) are formed so that the connecting elements of the support structure (112,300) can extend through the second flange opening (234). [Selection diagram] Fig. 2
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