City of Pella

Pella, IA

Key Features:

  • 6-position 69 kV ring bus
  • Four 69 kV line terminals
  • Two 69/12.47 kV transformers
  • New 15 kV distribution switchgear lineup
  • Interconnections with existing generation plant

Key Experience:

  • Design and coordination for cutover and expansion while keeping existing substation energized.

West Substation Conversion

DGR provided design, procurement, construction administration services for conversion of the existing substation needed to accommodate generation interconnection from the new Red Rock Hydro Project.  Project increased area transmission reliability and local load serving capability.

The project required conversion of existing 69 kV single bus into a six-position ring bus.  Required using existing equipment, relocating existing equipment, and installing new equipment.  Required extensive design planning and outage coordination to keep existing high-voltage and control circuits energized throughout construction.  Included full protection and control replacement.

Featured Projects

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  • Civil
  • Electrical Power
  • Survey
  • Wastewater
  • Water

Floodplain Analysis

DGR employed a Geographic Information System (GIS) in conjunction with the U.S. Army Corps of Engineers to first determine the 100-year flood elevations and delineate the floodway boundaries.

Floodplain Analysis
Sutherland, IA

Distribution Conversion

Due to concerns with the age and condition of the structures, along with safety clearances to energized equipment and conductors, a project was undertaken to replace the old infrastructure with new underground lines and associated padmount equipment.

Distribution Conversion
Redwood Falls, MN

Street & Utility Improvements

Morningside Avenue was reconstructed totaling approximately 1,300 linear feet. The project included new sanitary sewer, water main, storm sewer, fiber conduits, decorative street lighting, and 9-inch concrete paving with colored concrete sidewalks.

Street & Utility Improvements
Sioux City, IA

Wastewater Treatment Facility (SBR)

The City ultimately determined a flow-through style SBR system to be the preferred choice based on the selection criteria and the ability to meet anticipated permit limits.

Wastewater Treatment Facility (SBR)
Orange City, IA

Site Development

Planning started with site plan design for the new facility to offer maximum exposure to traffic on Highway 75.

Site Development
Rock Rapids, IA

Wastewater Treatment Facility (SBR)

The new plant, rated for 5.3 million gallons per day (MGD) peak day, doubles the capacity of its predecessor.

Wastewater Treatment Facility (SBR)
Sheldon, IA