Terra-Gen said the projects would use 100 V90 3MW turbines.
Terra-Gen has a PPA in place for the whole of the AWEC project with Southern California Edison.
In May, Google announced it was investing $55 million investment in the 105MW Alta Wind 4.
AWEC, which is located in the Mojave Desert, is set to be the largest wind project in the world. Building started in September.
Once complete, the Terra-Gen Power project will dwarf E.on's 782MW facility at Roscoe, Texas, and NextEra's 736MW Horse Hollow complex, also in Texas.