An arrangement related to a body of water for creating from a prevailing wind force conditions for generating electric power, comprising: individual but coordinated pontoon units (1, 2, 3) that may float in the body of water, a plurality of, at least two, wind turbines (4, 4a, 4b, 4c) arranged adjacent to each other and coordinated with each other, a horizontally oriented beam structure, which in itself is flexurally rigid, adapted and dimensioned to support said wind turbines (4, 4a, 4b, 4c), a mooring system ("M") solidly anchored to a limited bottom area ("B") of said body of water, a generator unit ("G") adapted to be driven by the rotating motion of the at least two wind turbines (4, 4a, 4b, 4c) for generating said electric power, a cable section connected on the one hand to said generator unit and on the other hand to a land-based distribution network distributing generated electric power, characterized in that said pontoon units (1, 2, 3) are in the shape of at least two substantially vertical first and second posts (1, 2) and in any case an upright, which may float per se, said first and second posts (1, 2) supporting said beam structure to form a frame portion, wherein each one of said first and second posts (1, 2) together with said upright are dimensioned and/or adapted such, that with their lower partial portions (1a, 2a, 3a) submerged in said body of water they permit said frame portion to be retained floating over the surface of the water, wherein said upright is displaced sideways with respect to a plane ("P"), defined by said frame portion and said first and second posts (1, 2), and wherein said upright is adapted to cooperate with said frame portion to stabilize the position of the frame portion in the body of water, and to be attached to and cooperate with said mooring system ("M"), wherein the arrangement further comprises: a bar-shaped means (10, 10a) extending between said upright and each of the first and second posts (1, 2) and having a framework structure dimensioned for taking up a compressive force, at least one first means (11, 11a) and an additional second means (12, 12a) extending between said upright and each one of the first and second posts (1, 2) and comprising wires dimensioned for taking up a tractive force, wherein the wires are attached to the first and second post (1, 2) on opposite sides above and below an attachment point of the bar-shaped means (10, 10a). individual but coordinated pontoon units (1, 2, 3) that may float in the body of water, a plurality of, at least two, wind turbines (4, 4a, 4b, 4c) arranged adjacent to each other and coordinated with each other, a horizontally oriented beam structure, which in itself is flexurally rigid, adapted and dimensioned to support said wind turbines (4, 4a, 4b, 4c), a mooring system ("M") solidly anchored to a limited bottom area ("B") of said body of water, a generator unit ("G") adapted to be driven by the rotating motion of the at least two wind turbines (4, 4a, 4b, 4c) for generating said electric power, a cable section connected on the one hand to said generator unit and on the other hand to a land-based distribution network distributing generated electric power, characterized in that said pontoon units (1, 2, 3) are in the shape of at least two substantially vertical first and second posts (1, 2) and in any case an upright, which may float per se, said first and second posts (1, 2) supporting said beam structure to form a frame portion, wherein each one of said first and second posts (1, 2) together with said upright are dimensioned and/or adapted such, that with their lower partial portions (1a, 2a, 3a) submerged in said body of water they permit said frame portion to be retained floating over the surface of the water, wherein said upright is displaced sideways with respect to a plane ("P"), defined by said frame portion and said first and second posts (1, 2), and wherein said upright is adapted to cooperate with said frame portion to stabilize the position of the frame portion in the body of water, and to be attached to and cooperate with said mooring system ("M"), wherein the arrangement further comprises: a bar-shaped means (10, 10a) extending between said upright and each of the first and second posts (1, 2) and having a framework structure dimensioned for taking up a compressive force, at least one first means (11, 11a) and an additional second means (12, 12a) extending between said upright and each one of the first and second posts (1, 2) and comprising wires dimensioned for taking up a tractive force, wherein the wires are attached to the first and second post (1, 2) on opposite sides above and below an attachment point of the bar-shaped means (10, 10a). a bar-shaped means (10, 10a) extending between said upright and each of the first and second posts (1, 2) and having a framework structure dimensioned for taking up a compressive force, at least one first means (11, 11a) and an additional second means (12, 12a) extending between said upright and each one of the first and second posts (1, 2) and comprising wires dimensioned for taking up a tractive force, wherein the wires are attached to the first and second post (1, 2) on opposite sides above and below an attachment point of the bar-shaped means (10, 10a).