Energy Imbalance Market

Map of California ISO, PacifiCorp and Western Electricity Coordinating Council

PacifiCorp and the California Independent System Operator launched the Energy Imbalance Market in November 2014. The EIM uses a sophisticated system to automatically balance demand every five minutes with the lowest cost energy available across the initial six-state combined grid.

The EIM leverages the growing diversity of renewable resources, flexible backup resources and demand using advanced technology to keep energy supply affordable and reliable. The new market is attracting additional participants and has the benefit of increasing benefits for all customers as diversity increases.

NV Energy plans to start participating in the EIM in 2015, with Puget Sound Energy and Arizona Public Service expected to follow in 2016.

Energy Imbalance FAQs and Fact Sheet
PDF Frequently Asked Questions
PDF Fact Sheet

Quarterly EIM Benefits Reports
PDF PacifiCorp/ISO EIM Benefits Report Q2 2015
The benefits report released on July 30, 2015 showed the EIM produced estimated benefits of $10.18 million in the second quarter.

PDF PacifiCorp/ISO EIM Benefits Report Q1 2015
The benefits report released on April 30, 2015 showed the EIM produced estimated benefits of $5.26 million in the first quarter.

PDF PacifiCorp/ISO EIM Benefits Report Q4 2014
The benefits report released on February 11, 2015 showed the EIM produced estimated benefits of $5.97 million in the first two months of operation.

These reports are in line with the prelaunch study (PDF) that found annual benefits would range from $21 million to $129 million. See news release (PDF)

Information for transmission customers and stakeholders
Information on EIM can be found on PacifiCorp’s Open Access Same-Time Information System (OASIS).

For more information, visit the ISO website

Expanding regional energy partnerships
PacifiCorp and the ISO announced in April 2015 they signed a memorandum of understanding for the energy company to explore becoming a full Participating Transmission Owner in the ISO. The agreement paves the way for performing a joint study on the feasibility and benefits of PacifiCorp joining the only competitive wholesale market in the West.

PDF Fact Sheet