High Voltage Support of Solar Interconnects

Large ground-mounted solar photovoltaic panels angled toward the sun on a utility-scale solar site, showcasing Halker’s renewable energy engineering expertise in high-voltage solar interconnect design, grid integration, and resilient power infrastructure.

As renewable generation continues to expand across Colorado and the greater U.S. power grid, utility owners and developers face complex technical and regulatory challenges in safely integrating new solar and energy-storage assets. Existing substations often require significant upgrades to accommodate solar interconnections, while interconnection studies and preliminary designs must meet stringent Regional Transmission Organization (RTO) and Independent System Operator (ISO) requirements for voltage stability, protection, and control coordination.

City-Operated General Electric DER Adoption

High-voltage transmission structures and substation equipment under overcast skies, illustrating Halker’s expertise in supporting city-operated distributed energy resource (DER) adoption and modern electric infrastructure planning.

A city-operated utility launched a Smart Grid Test Bed pilot program across three metropolitan areas to better understand how Distributed Energy Resources (DERs) could be effectively integrated into their power systems.

138kV to 25kV 50MVA Substation

Detailed single-line electrical diagram of a 138kV to 25kV, 50MVA substation layout showing transformers, breakers, and high-voltage equipment, highlighting Halker’s power engineering expertise in substation design, grid reliability, and high-voltage system integration.

To serve as the Owner’s Advisor on behalf of our client for a new substation project. This new substation would eventually connect into the transmission utility network to provide a more stable, reliable power source for our client’s power distribution system.

Power Distribution Sectionalizing Fuses

Overhead power distribution pole equipped with sectionalizing fuses, insulators, and energized conductors against a clear blue sky, showcasing Halker’s expertise in electrical engineering, grid reliability improvements, and utility distribution system design.

Halker’s client reached out to Halker to size sectionalizing fuses for their power distribution feeder taps to provide more sectionalizing protection and establish sectionalizing protection coordination.

Power Infrastructure Feasibility Study

Detailed electrical one-line diagram illustrating substations, breakers, and load flows, showcasing Halker’s power infrastructure feasibility expertise in evaluating system capacity, reliability, and interconnection requirements for complex utility and oil & gas projects.

his client approached Halker to perform a feasibility study and preliminary design for the required power infrastructure to supply around 45 MW of electrical load over an 8 mile stretch near Wright, WY. Halker was tasked with looking into providing kWh rate options and several utility interconnection options, providing preliminary designs for utility interconnection metering stations, substations, the power distribution system, and looking at cost breakdown for the various options.

Electrical System Studies

Arc-flash hazard warning labels displayed above a detailed electrical one-line diagram, emphasizing Halker’s electrical system study capabilities in short-circuit analysis, protective device coordination, and arc-flash safety compliance for oil & gas and utility facilities.

The client reached out to Halker to perform electrical studies on both existing and new-built assets. Through the studies, Halker would be able to advise the client on proper sizing of service, feeder, and branch circuits while maintaining adequate protective device coordination to decrease the risk of Arc Flash injuries. The goal was to make the client compliant per NEC regulations as well as the NFPA-70E standards for arc flash safety.