McCarthy Building Companies, Inc.

McCarthy Building Companies, Inc., founded in 1864 and headquartered in St. Louis, Missouri, is one of America’s leading general contractors with a significant focus on renewable energy infrastructure. Its Renewable Energy & Storage group specializes as an EPC contractor delivering large-scale utility solar and battery storage projects across the United States. Since 2010, McCarthy has constructed or is constructing over 100 utility-scale solar projects totaling more than 13 gigawatts of clean energy capacity and over 2300 MW/8350 MWh of battery storage.
The company provides comprehensive services including site evaluation; design; engineering; procurement; self-performed construction activities such as pile driving and module/tracker installation; substation work; grid interconnection infrastructure; as well as ongoing operations monitoring through its NERC/CIP-compliant center. McCarthy partners with private developers and utilities to deliver cost-effective clean power solutions that support both local communities’ needs and national decarbonization goals.
Notable achievements include serving as EPC contractor on landmark projects like Illinois’ largest Double Black Diamond Solar Farm (800 MW), Texas Solar Development (212 MW), Michigan’s Assembly Solar plant (346.9 MW), among others—often incorporating American-made components from industry leaders such as First Solar and Nextracker.
Additionally, McCarthy invests heavily in workforce development through registered apprenticeship programs designed to introduce new talent into the growing renewables sector while supporting compliance with federal incentive requirements.