Construction at the Hagerstown-based project will start in the second quarter and be completed in the fourth quarter, providing 125 jobs, the company said.
The project, in which First Solar has a 100 percent stake, will use the company's photovoltaic modules to power about 2,700 Maryland homes.
First Solar shares were up 2 percent in premarket trade. They had closed at $27.32 on Tuesday on the Nasdaq.
Reporting by Swetha Gopinath in Bangalore; Editing by Sreejiraj Eluvangal