It will be the first developer to install the 3MW turbine, which was launched at EWEC earlier this year, on US soil. The entire deal gives the project a total capacity of 227.5MW, although the utility said the size of the wind farm will depend on the results of a transmission study.
The project recently won approval from the Oklahoma Corporation Commission.
Siemens says its 3MW direct drive turbine, launched in April, has a lower weight and half the parts of one of its 2.3MW machines.
Direct drive turbines do not have gearboxes, but instead connect the rotor directly to a slow-speed generator. Manufacturers say these machines are more reliable.
Construction at Crossroads is due to begin in late August, with the first turbines being delivered next April.
Siemens’ agreement covers delivery, installation and commissioning, as well as service and maintenance for three and a half years.
Siemens has also recently announced it is establishing a blade factory in Ontario as part of a 600MW supply agreement with Samsung.