Est. 1994 Sigma Electric Contractors Are Valleywide Professionals Sigma Electric in Edinburg, Texas is able to handle all types of electric jobs from simple electric repairs to entire commercial offices or warehouses. Sigma Electric is licensed, bonded and insured for your protection. Sigma Electric started off as an electric company 18 years ago but now does A/C repairs as well! Jobs have also been done out of the Rio Grande Valley and Texas (i.e. Odessa, t.x., midland, t.x. and Oklahoma). If you have a job that is in or outside of the Valley, Call Sigma Electric! (956) 533-5979.