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Energy Imbalance Market

​EIM stakeholder meeting - May 15, 2019
9 a.m. - noon

BPA Rates Hearing Room
1201 NE Lloyd Blvd, Suite 200
Portland, OR 97232

Join by WebEx:

Meeting number (access code): 904 074 712
Meeting password: dpvYnSQM

Join from a video system or application

Join by phone: 415-527-5035

Meeting materials:
Meeting slide deck - May 15, 2019

NOTE: Attendees should bring their own printed copy of the presentation to the meeting if a hardcopy is desired. Handouts will not be provided.


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What is an energy imbalance market?

An energy imbalance market is a voluntary market that provides a sub-hourly economic dispatch of participating resources for balancing supply and demand every 5 minutes. This market is security-constrained, meaning transmission and reliability constraints would be honored.

The Western Energy Imbalance Market (EIM) is operated by the California Independent System Operator (CAISO). It is important to note that the Western EIM is not a regional transmission operator. BPA is not joining an RTO. BPA would preserve its autonomy and retain authority over transmission planning, day-ahead marketing, and transmission system and balancing authority operations if it were to join the EIM.

Why join the western EIM?

Selling surplus energy and capacity in the western markets is essential to keeping Bonneville’s rates low. BPA must adapt its business model as these markets change. Our analysis shows that joining the Western Energy Imbalance Market is one potential method to achieve this outcome.

Joining the EIM under the right conditions may result in increased value for the flexibility obtained from the federal hydropower system and other Northwest generators. It could also improve congestion management of the transmission grid. There are still many steps and hurdles to clear before any decision is made. BPA is currently determining how and under what conditions it could join the EIM, with a potential implementation date of April 2022.
Benefits accessible through EIM membership:
  • Congestion management functions that are more economically efficient than present curtailment and bilateral redispatch capabilities. 
  • Optimized day-to-day operation of the power system.
  • Transmission expansion investment decisions.

EIM stakeholder meeting - April 10, 2019

Comments received

EIM stakeholder meeting - March 13, 2019

Comments received

EIM stakeholder meeting - February 20, 2019

EIM stakeholder meeting - January 16, 2019

​EIM stakeholder meeting - December 18, 2018

​EIM stakeholder meeting - November 14, 2018
Comments received
​EIM stakeholder meeting - October 11, 2018

Comments received

NOTE: Attendees should bring their own printed copy of the presentation to the meeting if a hardcopy is desired. Handouts will not be provided.

EIM 101 Workshop - Sept. 13

BPA will present an Energy Imbalance Market 101 Workshop as part of our ongoing EIM Stakeholder Meeting series.

Comments received