The completion of the largest rooftop solar installation in the Pacific Northwest was announced today. Situated atop seven separate warehouses in Portland, Gresham and Clackamas, Oregon, the project covers 673,000 square feet of roof space — an area roughly equal to 14 football fields.

After builders first started work in March of this year, the Oregon solar installation was completed in just five months. The buildings’ owner, ProLogis, worked with utility Portland General Electric (PGE) and a range of local contractors to make the $14 million, 2.4-megawatt (MW) project a reality.

PGE has been building a reputation for supporting solar projects in its service area for the last several years. In 2009, the Solar Electric Power Association in 2009 ranked PGE in the top ten of U.S. utilities, as measured by solar watts per customer. The utility currently supports nearly 11 MW of solar projects through its net-metering policies alone. And, as one of Oregon’s main utilities, PGE is participating in the state’s pilot feed-in tariff, which, as we reported several weeks ago, became quickly oversubscribed — in some cases, in a matter of hours.

This is the second major solar project that PGE has completed at ProLogis facilities, and this newest project raises the utility’s total solar capacity to over 14 MW. Other solar projects handled by PGE include a partnership with the Oregon Department of Transportation to construct a 104-kilowatt (kW) solar highway demonstration project.