The project would produce 75 megawatts of electricity at peak, outpacing the world's most powerful array, a Nevada facility that produces 64 megawatts.
Kittitas County's community development department is requesting more information about the project, the newspaper says. The department's concerns center on increased construction traffic that would result from the project, as well as the effects of erosion from the property.
The state Department of Fish and Wildlife is raising concerns, too. The department says that the solar site is home to many types of fauna, and it cites runoff as a potential problem.
And a citizens' group, Friends of the Teanaway River Valley, is pushing for an environmental impact study. Jim Brose, a leader of the group, was quoted as saying that "we just want to make sure everything is looked at as it's supposed to be."
State residents' concern for the environment is unsurprising; in 2008, Forbes magazine said that Washington was one of the three greenest states in the nation. Even solar power's impact is called into question in the Evergreen State.
