Hatzel & Buehler, Inc.

Hatzel & Buehler, Inc. is the oldest electrical contractor in the United States, founded in 1884 by John D. Hatzel and Joseph Buehler, former master electricians who worked at Thomas Edison's Pearl Street generating station. Headquartered in Wilmington, Delaware, the third-generation, family-owned, IBEW-affiliated union contractor operates offices across several Northeastern and Midwestern states, providing electrical design, construction, engineering, integration, and maintenance services to commercial, industrial, healthcare, data center, and institutional clients.