Deriva Energy Deriva Energy would like to invite you to an OPEN HOUSE Learn about a proposed wind project in Washington County. Meet with the Deriva team to learn about wind energy and our project. Thursday, April 11 4-7 p.m. Washington County Fairgrounds 611 Hwy 1, Washington, IA. Dallmeyer Hall - Jim and Evelyn Eash Banquet Rm. (lower level of hall) Deriva Energy Deriva Energy would like to invite you to an OPEN HOUSE Learn about a proposed wind project in Washington County . Meet with the Deriva team to learn about wind energy and our project . Thursday , April 11 4-7 p.m. Washington County Fairgrounds 611 Hwy 1 , Washington , IA . Dallmeyer Hall - Jim and Evelyn Eash Banquet Rm . ( lower level of hall )