For over a century, Oncor has provided safe, reliable electricity to its customers. This is a role that we serve with pride and a job that we take very seriously. Currently, we are the nation's sixth-largest transmission and distribution company, operating in a high-growth service area that includes the fastest growing city in the nation: McKinney. Oncor is making numerous advancements to ensure it is able to provide the level of service the citizens of McKinney are accustomed to. Oncor's responsibilities include: electric transmission and distribution as well as meeting the energy delivery needs of commercial and residential developers.