NSI Electrical Contractors is a full-service commercial and industrial electrical contractor that serves southeastern Wisconsin. Founded in 1983, the company has earned a reputation as a reliable and skilled design/build electrical contractor. In business for more than 20 years, it has established relationships with general contractors, developers, architects, engineers, municipal inspectors and other members of the building trades. Its full range of services includes electrical maintenance, power outages, service upgrades, machine wiring, lighting renovation, fixture replacement, re-lamp, transformer failures and electrical repair. NSI Electrical Contractors is headquartered in Milwaukee, Wis.