On August 25 and 26, 2016, the California Independent System
Operator Corporation ("CAISO") filed Readiness
Certifications with the Commission for Puget Sound Energy, Inc.
("PSE") and Arizona Public Service Company
("APS"), respectively, signaling that PSE and APS are
ready to begin participation in the Energy Imbalance Market
("EIM") administered by the CAISO. According to the
CAISO, the expanded, six-Balancing Authority Area ("BAA")
EIM is scheduled to commence on October 1, 2016.
The EIM permits BAAs located outside of the traditional CAISO
footprint to participate in the real-time market for imbalance
energy that the CAISO operates within its own BAA. The EIM was
launched on November 1, 2014, with PacifiCorp (and its BAAs,
PacifiCorp East and PacifiCorp West) as the first "EIM
Entity." The EIM was later expanded to include Nevada Power
Company and Sierra Pacific Power Company (collectively, "NV
Energy"), which began participating in the EIM on December 1,
2015.
