System Improvements

Upgrading single and three phase distribution lines and member line taps in Palmer Lake area in 3 phases through 2024. Project will improve reliability in the area and bring lines up to current standards. CPI construction of Phase 2 is completed with restoration and 2 service upgrades remaining. Phase 3 is in design review and scheduled to begin construction in 2024.

Upgrading 8 miles of existing 3-phase 4/0 ACSR with 477 ACSR Hawk 26/7. Construction has been completed; all reclamation has been completed.

Upgrading 3.5 miles of existing 3-phase 4/0 conductor with 477 ACSR Hawk 26/7. Project also includes replacing existing CWC taps with 1/0 ACSR. Construction complete. All reclamation has been completed.

Four feeder exit projects have been identified. The first project is scheduled to start construction in January 2024 and the last completed in 2025. The Citadel distribution relocation project has been released for construction and is expected to be completed by the end of this year.

Upgrading 3 miles of single-phase line to three-phase in the Indian Mountain area, Conifer territory. Construction in progress.

This last phase of feeders out of Meadows Substation includes 2.8 miles of underground along Meadows Blvd. Construction is underway and is expected to be completed this year.

Relocating two main feeders from overhead to underground due to a Douglas County widening project on Pine Drive. The project is approximately 2 miles. Pine Lane construction is complete, and Pine Drive is expected by May/June 2024.

Construction is under way for the 2023 transformer replacements.

Construction is underway for the 2023 switch replacements.

Upgrading 1.5 miles of existing 3-phase to 3-phase 477 ACSR conductor to increase capacity, balance phasing and accommodate CORE ADSS fiber. This project has been released for construction. OFM has been forecasted and ordered. Start of construction is delayed until August 2024 due to environmental restrictions.

Bailey, Franktown and Parker will be complete by end of the year; Palmer Lake location is in design. Deer Trail has been completed and energized.

Relocating existing facilities in CDOT right-of-way to accommodate road improvements. The new alignment will be on private property and reattaching our facilities to the new location, Xcel’s recently installed pole. Construction completed. Project close-out in progress

Upgrade 1.7 miles of #6 CWC 1-phase line to 1/0 ACSR 1-phase to
remove CWC in the Squaw Pass area. Avian survey complete and there are no concerns. Construction completed. As-builts in progress.

Upgrade 7.5 miles of existing 3-phase #6 CWC with three-phase 477 ACSR Hawk 26/7. Construction in progress.

Upgrade 2.2 miles of existing 1-phase #6 CWC with 1-phase 1/0 ACSR. Construction in progress.

Parker sub has been completed. Homestead and Bayou are under construction. Elizabeth and Kiowa have been released for construction.

Construction of all regulator projects for this year have been completed.

Rebuild 2.5 miles of #6 CWC 1-phase line to 1/0 ACSR 1- phase. Received Notice to Proceed from BLM. Construction to start as soon as possible.

Working on ROW acquisition and permitting of this 8-mile double circuit line tap off the Kiowa – Brick Center line. CORE’s variance application was approved by Elbert County on August 23, 2023. BMcD submitted the SUR permit on September 28, 2023. SUR referral comments have been addressed and accepted by the County. 1041 permit expected to be submitted in December 2023. Cross Canyon Engineering has been selected for the final design of the Spring Valley Substation. HDR has been selected for the final design of the Spring Valley 115kV transmission line.

This is a reliability-based project to minimize line outages due to age, lightning, and voltage issues with the existing facilities. On April 28, 2022, CORE closed on a new parcel for the Strasburg Transmission substation. Parcel is approximately 1.5 miles south of the existing site. This project was put on hold in December 2022. CORE Engineering and Planning are investigating the possibility of relocating the Deer Trail substation to the south due to various design and planning concerns.

CORE Electric Cooperative will be rebuilding existing power lines (going from 44 kV to 115 kV), replacing some equipment/poles, and upgrading the Shawnee substation between Roberts Tunnel/Grant and Shawnee along Highway 285. These changes will improve the reliability of our infrastructure, add capacity for future growth in the area, and create year-round accessibility for maintenance.

As part of this project, contractors for CORE will be conducting data gathering, facility inventorying, utility locating, aerial and property surveys, and an Environmental Assessment that may require access on private property.

Progress to Date

Design, permitting and land rights activities are underway to upgrade the existing 44kV transmission line to 115kV.

• The project kick-off meeting with the United States Forest Service (USFS) went well.
• Preparation of POD for submittal to the USFS began.
• An engineering site visit occurred to discuss line route options and to propose some permanent access roads on USFS property.
• Additional line routes have been added to the line route matrix for review.
• We will continue to work on NEPA, line routes, conduct biological and cultural surveys, complete an Environmental Assessment, and work on the POD submittal to the USFS.

Questions? Contact (720) 722-2182.

Project includes a complete rebuild of the substation to increase capacity and improve reliability. Scope includes installation of upgraded 30/40/50 MVA transformers, replacing open air feeders with a new PCA building containing switchgear, new breakers, and improved access to the yard by adding a 2^nd entrance. Both transformers and the PCA have delivered and been set on their foundations. The project energization date is delayed a few months due to delay of the 115kV circuit breakers which arrived in July. The 115kV portion of the project has been restarted. CCE tested circuit switcher 306-04 and T2 secondary cable on 3/14/23, CCVT’s were delivered on 3/13/23. Powell installed the ATS for the PCA the week of 3/27/22. Shoo-fly has been installed and CPI resumed activity. Remaining high-side removal has concluded and foundations are being poured.

Rebuilding the existing Shawnee substation from 44kV to 115kV. Permitting and ROW acquisition activities are underway. Revisions to the site plan are in progress. Preparing submittal to the State Land Board. Project kick-off meeting with the FS went well. HDR had meeting for the project Open House in July. CORE and HDR has a follow up meeting in October to address concerns that were expressed during the open house. HDR is working on civil design to push site further east.

Xcel completed the power flow study to evaluate the addition of a new interconnection at the Missile Site Substation, approximately 6 miles east of the Deer Trail Substation, which would add a second source to our system’s eastern territory and improve reliability in the area and allow growth. They determined Missile was not a feasible interconnect point and are now studying a tap of the Pawnee to Brick Center 230kV line to accomplish our transmission-to-transmission interconnect.

The temporary transmission shoo-fly has been constructed by CPO. Construction on the permanent reroute is scheduled for fall 2024.

The greenfield Citadel Substation located in south Castle Rock, west of I15 is currently under construction by Great Southwestern. Grading was completed. Most foundations have been installed along with steel. T1 to arrive in November and the PCA in January of 2024.

CPI has been awarded to the construction for the 115kV double circuit transmission line from Wolfensberger substation to the new Citadel substation. Construction started in October 2023 and is expected to be completed in September 2024.

Entrust was awarded the final engineering for redesigning the existing 115kV transmission line. Bill of Materials has been sent to CORE Procurement for ordering and the steel pole bid package has been awarded to Valmont. Construction is expected to start late 2024.

The design of the second transformer at Lemon Gulch has been awarded to GSWC. Construction is scheduled to begin in November 2023 to align with the delivery of the transformer.