The Marubeni-led group had previously said in June that work on installing Mitsubishi Heavy Industries' (MHI) 7MW SeaAngel turbine on the floating platform would begin in early December.
A reason for the delay was not given, but the consortium said construction of the nacelle is still in progress at MHI's Yokohama facilities.
The transport of the floating platform from Nagasaki to Onahama, Fukushima province, is currently underway, with the structure set to arrive on 10 November.
Installation of chains, anchors and undersea cables at the testing area has been completed. There have also been improvements to the dock in preparation for mounting the turbine on the platform.
The group sounded a further note of caution, indicating that more delays could be possible "depending on the meteorological and sea conditions".
The turbine, which features a hydraulic drivetrain, is to be installed on a three-column semi-submersible floating platform. A second floating turbine is set to be installed at some point in 2015.
Marubeni leads the consortium, working in conjunction with the University of Tokyo, MHI, Japan Marine United, Mitsui Engineering and Shipbuilding, Nippon Steel and Sumitomo Metal Corporation, Hitachi, Furukawa Electric, Shimizu, and Mizuho Information and Research.