The Danish manufacturer will deliver 83 V100-2MW turbines to the site in the northern state by the end of 2015.
Vestas has already been contracted to supply the remaining 34MW at Pleasant Valley in an order placed when the companies signed a 610MW master supply agreement (MSA) in September 2013.
This most recent order is the last one of the MSA between Vestas and RES Americas.
According to Vestas, under the MSA it received 350MW of orders directly from the American developer and 260MW from other buyers that bought projects from RES Americas.
Last week, Vestas announced a 124MW order from RES Americas to supply 62 V100-2MW turbines to the Border Winds project in North Dakota.