Press Releases

April 24, 2019

TID to join California ISO’s Western Energy Imbalance Market

TURLOCK – On March 26, 2019, the Turlock Irrigation District (TID) Board of Directors unanimously voted to take the actions necessary for TID to participate in the California Independent System Operator’s (CAISO) Western Energy Imbalance Market (EIM).

“The EIM will provide TID with access to a wider market,” said Casey Hashimoto, TID General Manager. “Based on the analysis, TID’s generation resources will be utilized more effectively within the EIM.”

EIM, a real-time bulk power trading market, enables participating entities to economically balance supply and demand within the market area in real-time by scheduling power deliveries every 5 minutes.

The cost for TID to join the EIM is expected to be approximately $5.5 million.  Estimated cost savings realized by joining the EIM are expected to recoup the start-up costs in just two to three years. TID anticipates participation in the EIM to begin in 2021.

In addition to the economic benefits associated with joining the EIM, over 75 percent of the load in the Western Interconnection have committed to participate in the EIM by 2021. With the amount of utilities participating in the intra-hour market, TID expects the hourly markets it currently participates in will become much less liquid compared to previous years. Over time, this reduced liquidity would likely lead to increased purchased power and fuel costs, absent participation in the EIM.

Active EIM participants include the CAISO, Idaho Power Company, Portland General Electric, Arizona Public Service, NV Energy, and PacifiCorp.  Powerex, Puget Sound Energy and Balancing Authority of Northern California/SMUD, Los Angeles Department of Water & Power, Seattle City Light, and Salt River Project expect to begin participating in spring 2020.  Public Service of New Mexico, and Northwestern Energy expect to begin participating in 2021.


Media Contacts:

Constance Anderson | | 209.883.8448

Brandon McMillan | | 209.883.8539

About the Turlock Irrigation District (TID)

The Turlock Irrigation District, located in Turlock CA, is the first publicly owned Irrigation District and is one of only four today that provides irrigation water and power to residential, commercial, industrial and agricultural customers within its service area. TID has been in the retail electric business since 1923. TID provides safe, low-cost, reliable energy to a growing customer base that today exceeds 100,000 home, farm, business, industrial and municipal accounts. TID also serves 5,800 irrigation customers covering approximately 150,000 acres of farmland. For more information about TID visit and follow @TurlockID on Twitter.