Latest News: December 10, 2018

Current construction work zones map

The map above displays the current and upcoming work areas for the Thornton Substation Project. Click on the map to see a larger version.

Currently, crews are working within Holly Street, between East 112th Avenue and East 120th Avenue, to install the cable in the underground duct banks. To complete the cable installation, crews will work between 7 a.m. and 6 p.m., Monday through Saturday, and traffic control will be picked up at the end of each workday. The installation of the cable will continue into 2019.

During the installation of the cable, construction work zones will include:

  • Shifting shoulder or lane closures within Holly Street, between East 112th Avenue and East 119th Avenue.
  • Shoulder or lane closures will adjust to surround the current work area as crews move along Holly Street and East 112th Avenue.

Starting in early 2019, remaining work zones will include construction of the substation, access roads, and a new right turn lane from Holly Street onto East 119th Avenue.

We thank the community for your continued patience during the construction of the project. Public safety is at the foundation of all we do. It's our mission to ensure your family, neighbors, and every one of our employees stay safe each day. Xcel Energy is committed to continuing to maintain safe construction work zones and motorist and pedestrian detours as dictated by our traffic control plans that are reviewed and approved by the City of Thornton. Please use caution when walking or driving near construction zones.

Please be mindful of current construction conditions and traffic control measures, as they are likely to change based upon construction progress. Please help us maintain a safe community environment by participating in safe practices near our construction work zones:

  • When feasible, take alternate routes to bypass the construction work zones.
  • Slow down near construction work zones and follow the posted speed limit.
  • Be aware of the location of crews and equipment.
  • Eliminate distractions such as cell phones.
  • Expect delays to navigate through the work zone.
  • Follow all posted signs and directions from construction or traffic control personnel.
  • Be aware of the location of traffic cones, barrels and barriers that define travel lanes and identify the construction work zones.
  • Be mindful that construction work zones change frequently.

This webpage will be updated as additional information regarding construction activities is available.

If you have any questions or concerns about our construction, please email us at or call our project hotline at 844-551-6281. To receive email updates, subscribe to the Thornton Substation email list.

Please note that construction schedules are subject to change.

Project Schedule

Please note that the project schedule is subject to change.

  • Fourth Quarter 2017: Installation of security fencing and demolition of existing structures at the substation site
  • Second Quarter 2018: Grading activities to begin
  • Second Quarter through Fourth Quarter 2018: Underground transmission line construction
  • Second Quarter 2018 through First Quarter 2019: Wall and foundation construction
  • Fourth Quarter 2018 through First Quarter 2019: Underground transmission line cable installation
  • Fourth Quarter 2018 through Third Quarter 2019: Substation electrical equipment installation and testing
  • Mid-2019: Substation construction complete and in-service
  • Third Quarter through Fourth Quarter 2019: Installation of landscaping