An installation for charging electric cars includes the following features: charging columns, direct-current lines, rectifiers, three-phase alternating-current lines, a single-phase alternating-current line and a cooling arrangement. The direct-current lines electrically connect the charging columns to the rectifiers. The three-phase alternating-current lines electrically connect the rectifiers to a medium-voltage transformer. The single-phase alternating-current line electrically connects the medium-voltage transformer to the cooling arrangement.