Charlotte, North Carolina

Duke Energy recognized a need to improve reliability and resiliency of the Charlotte, NC DTUG electric system, which could only be achieved by redesigning existing circuitry, such that the normal and emergency circuits be fed from different substations.  

Challenge 

Duke Energy recognized a need to improve reliability and resiliency of the Charlotte, NC Downtown Underground (DTUG) DTUG electric system, which could only be achieved by redesigning existing circuitry, such that the normal and emergency circuits be fed from different substations.   

The existing DTUG system design is comprised of automatic and manual switchgear that are served by a system of normal and emergency circuits, at two different primary voltages, whose origin is the same substation transformer bank.  TRC balanced the following conflicting parameters 

  • Design feeders from different substations – yet minimize duct/conductor lengths. 
  • Install new conductors – yet maintain spare ducts for future expansion.  
  • Minimize cost and construction – yet plan for known future growth. 
  • Utilize existing infrastructure – yet where possible, retire 12kV and expand 24kV systems. 
GettyImages-1974056601-1

Solution 

This project required a comprehensive redesign of the DTUG electric system, which included Cyme load flow analysis and balancing, contingency planning, cable pulling and duct/manhole routing, duct bank thermal load analysis, subsurface review, and a ten-year phased execution plan. 

Result 

TRC recommended the construction of new substation and associated power distribution circuitry.  Our deliverables included stamped and electronic AutoCAD final drawings, depicting the overall design showing circuit routes, duct bank, manholes and vaults.  We produced manhole maps showing conduits and new circuitry, as well as subsurface engineering documentation of the existing space around infrastructure in the roadway to complete the new duct installation.  Circuit capacity studies were produced with the use of CymCAP design tool and summarized on a spreadsheet for all circuits to show the capacity at critical loading points on each circuit.  

In support of phase two of this project, TRC is helping to further refine the Ten-Year Phased Implementation Plan by breaking it down into individual work orders, so they can be handed off to construction. 

  • Client: Duke Energy
  • Project Location: Charlotte, North Carolina

Achieve New
Possibilities

Partner With TRC’s Tested Practitioners

Contact Us

Sharing Our Perspectives

Our practitioners share their insights and perspectives on the trends and challenges shaping the market.

01-What-Is-Grid-Resilience-and-How-Can-It-Be-Improved
Insights

What Is Grid Resilience and How Can It Be Improved?

September 5, 2024

Understand power grid resilience. Future-proof your operation with TRC Companies, using technology and expertise to boost grid resiliency today.

GettyImages-930762432-scaled-1

Joint Use: Best Practices for Project Success

July 15, 2024

Joint use has never been as important as it is today. With demand for telecommunications infrastructure skyrocketing, governments are investing big in initiatives like the $42.5 billion Broadband Equity Access Deployment Program (BEAD) and the $20.4 billion Rural Digital Opportunity Fund (RDOF).

e2fdef7d-photovoltaic-panels-of-solar-power-station-at-sunset-662095604
Regulatory Updates

NERC Proposes Changes to Registration Criteria for Inverter Based Resources (IBRs)

April 19, 2024

NERC has submitted for FERC approval new compliance criteria for the registration of IBRs as part of continuing efforts to address reliability risks. It is critical for renewable energy developers, generation owners and transmission owners to understand the potential implications for interconnection studies and interconnection queues.