Preliminary Design and Environmental Engineering Services

Our multi-disciplinary design team blends expertise and proven reputation for innovative, quality design and commitment to sustainable solutions, with services including:

  •     Transmission line routing and corridor identification
  •     Conceptual transmission conductor and structure designs
  •     Substation spotting and conceptual layout
  •     Environmental impact assessment
  •     Route selection and route alternatives due diligence
  •     Route alternative cost estimating
  •     GIS and mapping
  •     Soils investigations and foundations recommendations
  •     Comprehensive design basis development

Detailed Design

We apply specialized knowledge and technical expertise to design transmission lines and substations, including tailored solutions for:


  •     Terrain grade optimization
  •     Below grade design (grounding and foundations)
  •     Civil structural design
  •     Electrical design
  •     SCADA, relaying and communication systems
  •     Gas insulated substation design
  •     Instrumentation and controls


  •     High Voltage AC and DC transmission systems
  •     Conductor selection and optimization
  •     Capacity line ratings and line uprating studies
  •     Structure spotting optimization
  •     Underground and submarine AC and DC transmission lines
  •     Structure design (lattice towers, steel, concrete and wood poles)
  •     Foundation design


  •     Distribution feeder design
  •     Overhead and underground design

Construction and Construction Management

We offer a full range of high-value, “start-to-finish” pre-construction, construction and construction management services including:

  •     Construction sequence planning and constructability reviews
  •     Preparation of construction drawings
  •     Preparation of procurement specifications and documentation
  •     Procurement planning and bid management
  •     Construction monitoring and inspection
  •     Close out and as-built documentation

Start-up and Commissioning

ASSIST Consultants Inc. (ACI) expertise runs the full lifecycle of a project, including partnering with our clients for project start-up and commissioning including:

  •     Integrated communications, controls, protection and metering solutions
  •     Acceptance testing and commissioning