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