Oncor is upgrading Auto Transformers in the City of Heath on July 29 and July 30 from 9 a.m. to 3 p.m. Customers affected by any necessary power outages during the upgrade are being notified by Oncor 48-72 hours prior with text messages and by door hangers for those who do not have automatic messaging with Oncor set up. The work is concentrated in the areas south/southwest of FM 740/Smirl.
Here is a link to sign up for the Oncor notification service: https://www.oncor.com/outages/oncor_alerts/identify
*** Auto transformers are used to regulate voltage on the distribution system as well as step up or step down voltage. This upgrade is to ensure reliable service during cold weather.