Slip formed concrete wind turbine tower

A method of erecting a wind turbine comprising a concrete tower supporting a nacelle, a generator and a rotor thereon, the method comprising:

• forming a foundation;
• assembling a slip form comprising an inner form assembly and an outer form assembly defining an annular casting space therebetween having an open bottom end;
• supporting the slip form on the foundation;
• supporting a gantry comprising a primary lifting device above the slip form;
• pouring concrete into the casting space in the slip form to define a first wall portion of the concrete tower;
• raising the slip form together with the gantry relative to the first wall portion;
• pouring concrete into the casting space in the slip form to define a plurality of subsequent wall portions;
• raising the slip form together with the gantry relative to a previously formed one of the wall portions after concrete is poured into each of the plurality of subsequent wall portions until the concrete tower is formed;
• transferring the gantry from the slip form to the concrete tower;
• lifting the nacelle onto the concrete tower using the primary lifting device;
• lifting the generator onto the concrete tower using the primary lifting device and attaching the generator to the nacelle;
• lifting the rotor onto the concrete tower using the primary lifting device and attaching the rotor to the generator;
• supporting a secondary lifting device on the concrete tower;
• lowering the gantry and the primary lifting device to the foundation using the secondary lifting device.