Tiered Rate Methodology (TRM) Studies

TRM not only impacts the overall level of power supply costs, but may also require modifications to utilities’ cash flow management, cost allocations and rate designs. Demand and load shaping charges can result in significant variability in monthly power supply costs. In addition, the TRM rate structure includes changes that may impact the allocation of costs among utilities’ customer classes. As utilities’ loads grow it will become very important to consider how utilities’ Tier 1 allocations are shared among new and existing retail customers. EES Consulting has assisted utilities in evaluating whether or not the TRM wholesale rate design should be carried over into retail rate setting.

Northwest Studies

Below are a few of the Northwest utilities that EES Consulting has assisted with TRM-related power supply and rate design issues in the last few years:

  • Benton County PUD
  • Benton Rural Electric Association
  • Blanchly-Lane Electric Coop
  • Canby Utility
  • Central Electric Cooperative
  • Central Lincoln People’s Utility District
  • City of Bonners Ferry
  • City of McMinnville
  • City of Port Angeles
  • City of Richland
  • Clark Public Utilities
  • Clearwater Power
  • Columbia River Electric Association
  • Douglas Electric Cooperative
  • Emerald People’s Utility District
  • Fall River Rural Electric Cooperative
  • Inland Power and Light


  • Kittitas PUD
  • Lower Valley
  • Lewis PUD
  • Mason County PUD #1
  • Midstate Electric Cooperative
  • Missoula Electric Cooperative
  • Northern Lights, Inc.
  • Northern Wasco
  • Okanagan REA
  • Pacific County PUD
  • Ravalli County Electric Coop
  • Salem Electric
  • Salmon River
  • Skamania County PUD
  • Tanner
  • Tillamook PUD
  • Wasco Electric Cooperative

Featured Projects

Box Canyon Project Studies

Public Utility District No. 1 of Pend Oreille County, in Washington state, selected EES Consulting as the lead consultant for relicensing studies for the Box Canyon Hydroelectric Project.  The relicensing involved numerous engineering and resource studies.  EES Consulting staff members performed studies and managed and coordinated activities of consultants and subconsultants who conducted engineering and environmental studies for project license amendment and relicensing.

Clark Public Utilities

EES Consulting has assisted in strategic planning, engineering and rate setting activities for CPU for the past twenty years.  Activities completed include load forecasting, power supply cost forecasting, feasibility studies on generation projects, integrated resource planning, and conservation implementation planning.  EES Consulting has issued requests for proposals (RFPs) on Clark’s behalf for power generation projects, natural gas supplies and power purchases.