Oncor Transmission Line Project Information

Oncor Electric Delivery is proposing a new transmission line through southwest Denton County. Oncor is considering several different routes, some of which enter west Flower Mound. The proposed Ramhorn Hill-Dunham 345 kV Transmission Line Project will connect two proposed switches, one south of Rhome in Wise County and the other located southeast of the FM 1171 and Hwy 377 interchange.

On June 8, 2023 Oncor filed an Application at the Public Utility Commission of Texas (PUCT) under Docket No. 55067 to construct and operate the proposed project. Click here for access to the docket on the PUCT Interchange.

Oncor Information

Additional information about the project is available from the following website:

  • Oncor's Project Website
    • Select “RAMHORN HILL — DUNHAM 345 kV TRANSMISSION LINE PROJECT” from the dropdown menu.


Oncor representatives can be contacted regarding the Ramhorn Hill – Dunham 345 kV Transmission Line Project at 214.486.4717.

Previous Action

In November 2022, Oncor contacted property owners within 500 feet of the potential proposed routes. On Dec. 7-8, 2022, Oncor held public meetings about the project. 

After learning about the project and following the Oncor public meetings in December 2022, Flower Mound Town Council met in closed session during its December 19, 2022, regular meeting to consult with the Town attorney about the project. Once reconvened in open session, Town Council voted 5-0 to pass a resolution expressing concern about the impacts the project will have on Flower Mound residents. Read the resolution here. Oncor representatives attended Town Council’s Jan. 19 work session to discuss the project further. Watch the video here. Mayor Derek France also met with Congressman Michael Burgess, Senator Tan Parker, the mayors of Northlake and Argyle, Oncor representatives, and Army Corps of Engineers regional leadership staff to discuss a potential route through Corps land and finding a solution that could work for all the agencies involved. Based on the June 8, 2023, PUC filing by Oncor, an alternative southern route through Corps property was determined not feasible.