IES Holdings specialises in the design and installation of electrical and technology systems across the United States, serving multiple market segments. The core of its operations lies in providing electrical installation services for the residential sector. The company has established a network of regional service providers, which continue to operate under their own branding while leveraging the combined infrastructure and resources of IES. This integration, coupled with IES’s procurement advantages and financial stability, distinguishes it from smaller, privately-owned contractors.

The remaining 40% of the company’s operating profit is derived from serving industrial clients. Its communications division focuses on the design, construction, and maintenance of communication infrastructure within data centres. Additionally, the company delivers electrical and mechanical air-conditioning (HVAC) solutions, including design, construction, and maintenance, as well as infrastructure services such as generator enclosures.