The city of Guttenberg, Iowa, filed an amended preliminary permit application on Sept. 9 with the Federal Energy Regulatory Commission for a 25-MW hydro project on the Mississippi River.
The city had in July 2010 been granted an initial preliminary permit to study the feasibility of the proposed project. A successive preliminary permit application was submitted to FERC on July 1 of this year. But then on July 25, the commission sent the letter saying that the application lacked certain needed details, prompting the Sept. 9 application update.
Working with Missouri River Energy Services (MRES), the city has developed a preliminary energy model for the site. Using river data from February 2003–May 2011, it assumes the installation of a traditional powerhouse with five new pit type horizontal turbines with a 6.5 meter runner diameter and a capacity of approximately 5 MW each, for a total installed project capacity of 25 MW. The powerhouse is anticipated to be a concrete structure located entirely within the footprint of an unused auxiliary lock, with dimensions smaller than the auxiliary lock.
Waters of the Mississippi River would flow directly into the powerhouse as they enter the auxiliary lock. Waters exiting the powerhouse would flow directly back into the Mississippi River, and no tailrace structures are anticipated at this time.
The average head is estimated to be between 6.5 and 7 feet. The city said it has assumed the completed project would produce about 79,300 MWh annually using a capacity factor of 36%.
The project would be at U.S. Army Corps of Engineers Lock and Dam No. 10. The proposed project is entirely within the state of Iowa and the area of potential effects of the project is within Clayton County, Iowa.
This application is made in order that the applicant may secure and maintain priority of application for a license for the project while obtaining the data and performing the acts required to determine the feasibility of the project and to support an application for a license.