Emergency Electrical Services Available 24/7. We Are Licensed, Bonded, and Insured. STS Electric: Your Top Choice for Licensed Electricians in Chicago. Serving the Chicagoland area for over 40 years, we specialize in both residential and commercial electrical services. As a leading electrical contractor, we commit to excellence and customer satisfaction. Our experienced technicians, backed by fully stocked service vehicles, quickly resolve any electrical issue, big or small.