About

The ISO’s Energy Imbalance Market (EIM) is a real-time energy market, the first of its kind in the western United States.

The EIM’s advanced market system automatically finds low-cost energy to serve real-time consumer demand across the west. Since its launch in 2014, the EIM has enhanced grid reliability and generated cost savings for its participants. Besides its economic advantages, the EIM improves the integration of renewable energy, which leads to a cleaner, greener grid.


Participants

Active

Balancing Authority of Northern California (Phase1) – entered 2019

Idaho Power Company – entered 2018

Powerex – entered 2018

Portland General Electric – entered 2017

Puget Sound – entered 2016

Arizona Public Service – entered 2016

NV Energy – entered 2015

PacifiCorp – entered 2014

California ISO – entered 2014


Pending

Salt River Project – entry 2020

Seattle City Light – entry 2020

Los Angeles Department of Water & Power – entry 2021

Public Service Company of New Mexico – entry 2021

NorthWestern Energy – entry 2021

Turlock Irrigation District – entry 2021

Balancing Authority of Northern California (Phase 2) – entry 2021

Avista – entry 2022

Tucson Electric Power – entry 2022

Tacoma Power – entry 2022

Bonneville Power Administration – entry 2022


Implementation documents

  • Avista
  • Arizona Public Service
  • Balancing Authority of Northern California
  • Bonneville Power Administration
  • Idaho Power Company
  • Los Angeles Department of Water and Power
  • NorthWestern Energy
  • NV Energy
  • PacifiCorp
  • Public Service Company of New Mexico
  • Puget Sound Energy
  • Portland General Electric
  • Powerex Corp
  • Salt River Project
  • Seattle City Light
  • Tacoma Power
  • Tucson Electric Power
  • Turlock Irrigation District

Active and pending participants

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