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The invention relates to a double bus bar electricity substation having two bus bar sets (23,24), each of which is received between a central row (40) of metal columns (25) and a parallel side row (41,42) of metal columns (26,27). Each pair of adjacent metal columns (25) of the central row (40) supports a horizontal metal girder (7) that is substantially parallel to said rows, and that which is assigned to a respective phase of the substation, each insulator (13,14) carrying, at one end, a fixed contact (8B,98) that is electrically connected via a cable (10,11) to a bus bar (3,4) conveying said phase. The substation incorporates, per phase, one item of interrupting and selecting switchgear comprising a circuit-breaker and two disconnectors (8,9), it being out-of-service position in which it is out of circuit, and an in-service position in which it is connected to the voltage and is held stationary between two central columns (25). Drawing: 05 Sheets. Total Pages: 16. Fig. Nil