(720) 647-5652

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About PRE

PRE is an engineering firm specializing in renewable energy, energy storage, utility interconnection, substation design, protection and control design, communication design, and power flow studies. PRE's main office is located in Centennial, CO.

Founded in 2005, PRE has the experience necessary to take on any engineering project efficiently and effectively. Our knowledgeable staff work collaboratively and are well equipped to deliver the best results in quick time-frames.



Industries we Serve:
Electric Utilities
Renewable Energy
Oil & Gas
Energy Generation
Waste Water Facilities

Services Provided Include:
Substation Design
SCADA and Communication Design

Construction Support

Power System Studies
Relay Settings

Electricity Station

Substation Design


Construction Support




Communication and SCADA Engineering



Past Projects

Below highlights a few projects that PRE has completed throughout our history.

Greeley Substation Rebuild
Completed the control design needed to expand the existing 115kV sub to double of its original size, installing a new control building, and replacing the transmission portion of a substation by converting it from single bus to breaker and a half with 8 new breakers.

Ridge Substation
Completed the control design for a 115/230kV transformer replacement, and the conversion of a portion of the substation to 230kV.

Rosedale Substation Rebuild
Completing the control design for expanding sub from 2 line, 2 distribution transformer straight bus substation, to 4 line, 2 transformers, breaker and a half substation, inter-tie of Xcel and WAPA. Also completed the design for future 230kV yard.

Missile-Pawnee-Smoky Hill Substations
Completed the relay settings related to addition of 345kV system between the substations, including multiple 345/230kV transformers.

Cooper Compliance  PRC-01-19-24-25
Performed detailed analysis for generation entities requiring compliance to NERC standards on relay settings and relay training. Niwot-Gunbarrel Upgrade. Created the relay settings for a project which added a new 230kV underground line, new 230/13.8kV transformer, and new 13kV switchgear, as well as the replacement of relaying on adjacent 230kV lines.

San Luis Valley Relay Upgrade

Created the relay settings related to a new 115kV substation with two lines and one generator interconnect, as well as the replacement of relaying at remote ends of each line, and a second generation interconnect at another location.

Keenesburg Sub Rebuild
Completed the control design for a large scale substation expansion. The substation was converted from a 3 breaker, 3 line ring bus, to an 8 breaker, 5 line breaker and a half system.

Comanche-Daniels Park 345kV
Created the relay settings for two new 345kV lines, two ties to a new 750MW generating plant, and two 345/230kV auto-transformers, as well as breaker fail and bus protection relays.

Hobbs/Higgs Rebuild
Created the relay settings for new substation with 3 generator interconnects, three 230kV lines, seven 115kV lines, and one 230/115kV auto transformer.

Cox Substation
Created the relay settings for a substation rebuild, involving 4 transmission lines, 1 auto-transformer, and 2 cap banks.

Valmont 230/115kV Auto #2
Completed the control design and relay settings for a new auto-transformer, as well as 3 new breakers.

Contra Costa Sanitary System Studies
Performed short circuit analysis and created medium voltage relay settings and low voltage breaker settings for the entire facility. The plant includes five 12kV substations, 12kV cogen plant, and 12kV standby power plant (3 generators), and many hundreds of 480V breakers (1200 buses in SKM model). Also performed arc flash analysis of the facility included in work. Also did extensive modeling of system in SKM PowerTools and created a 400 page report, with 100+ TCCs issued 4 times over a 6 year period as new generation was added, breaker trip units were replaced, and the system was expanded.

WestPower Energy Ongoing Support Tasks
Provided long term technical advise and commenting on various power plant projects under development by WestPower. Work involved fault analysis, relaying comments, and technical feasibility assessment, and in some cases relay settings. Project list included Plains End generation (Relay settings, comments on design), Temple Inland (comments on design), San Francisco Airport Generation (comments on design), Tri-Hydro (relay settings) project, Wellhead-Mirimar (relay settings, comments on design), Wellhead-Margarita (relay settings, comments on design), Moreno Valley (relay settings, comments on design), Wawona foods (relay settings, comments on design), Yale University (relay settings), Emery Station, CA (building coordination, equipment sizing, arc flash analysis), and many others.

Solar Gen II
Completed the control design for a new 115kV substation and 50 MVA GSU, used for feeding solar power to the Imperial Irrigation District 161 and 230kV transmission system.

Amazon A100 Substation

Completed relay settings and control design for a new distribution substation with two 15/13.8kV distribution transformers.

Pepco Generation Interconnection
Created the relay settings and provided control design assistance for the interconnection of a standby/Cogen generation plant to the utility grid.

Poncha Junction 230kV Expansion

Completed the control and physical design for adding a 230kV side to an existing 115kV yard. The project included the installation of a 230/115kV transformer and adding a line which interconnected two separate utilities. the design also included the installation of a new control building.


Contact PRE

PRE is always accepting resumes for quality individuals who share our vision and values, and wish to join our team. Please send resumes and any other information to careers@p-r-eng.com.

2305 E Arapahoe Rd, Ste 260
Centennial, CO 80122

(720) 647-5652