It will provide 22 of its SWT-3.4-108 turbines for the sites, which are owned by Japanese real estate company Tokyu Land Corporation, and which have a combined capacity of 74.8MW.
The nacelles and hubs will be produced in Denmark, while the blades will be manufactured in China and Denmark.
Siemens Gamesa delivered the first batch of turbines in April and will ship the remainder this year and next.
The company will also handle operations and maintenance (O&M) services at the two unspecified projects for the next 20 years.
Contracts for the order were signed in August 2017 and March 2018 and were counted in Siemens Gamesa’s most recent quarterly financial results in which it recorded a record Q2 order total.
The manufacturer has installed more than 323MW in Japan since entering the market in 1999, it stated.
Japan has just over 3.4GW of installed capacity, according to Windpower Intelligence, the research and data division of Windpower Monthly.
Rival manufacuturer Senvion received an 23.8MW order in March.