CAISO Website

Map of CAISO

The California Independent System Operator (CAISO) operates a competitive wholesale electricity market and manages the reliability of its transmission grid. CAISO provides open access to the transmission and performs long-term planning. In managing the grid, CAISO centrally dispatches generation and coordinates the movement of wholesale electricity in California and a portion of Nevada. CAISOs markets include energy (day-ahead and real-time), ancillary services, and congestion revenue rights. CAISO also operates an Energy Imbalance Market (EIM), which currently includes CAISO and other balancing authority areas in the western United States.

CAISO was founded in 1998 and became a fully functioning ISO in 2008. The Energy Imbalance Market launched in 2014 with PacifiCorp as the first member or EIM Entity. The EIM serves parts of Arizona, Oregon, Nevada, Washington, California, Utah, Wyoming and Idaho.

List of Orders

Click on the categories below to view additional information.

Docket No. Date Issued Company Title
ER24-2042-000  05/15/2025 California Independent System Operator Corporation  Order on Compliance 
ER25-526-000 03/20/2025 California Independent System Operator Corporation OALJ Certification of Uncontested Settlement

ER25-437-000

02/20/2025

California Independent System Operator Corporation

Order Accepting Tariff Revisions

Docket No. Date Issued Company Title

ER24-155-000

07/25/2024

California Independent System Operator Corporation

Order on Compliance Filing

ER24-494-000

02/15/2024

California Independent System Operator Corporation

Letter Order Granting Request for Petition

ER24-355-000

02/15/2024 California Independent System Operator Corporation Letter Order Granting Petition
Docket No. Date Issued Company Title

EL22-62-000

09/21/2023

California Independent System Operator Corporation

Order on Show Cause Proceeding

ER21-2455-003 05/18/2023 California Independent System Operator Corporation Order on Compliance Filing
ER22-2362-000 04/20/2023 California Independent System Operator Corporation Order On Compliance Filing
Docket No. Date Issued Company Title
ER22-2730-000 12/15/22 California Independent System Operator Corporation Letter Order Granting Petition
ER21-2455-002 10/20/22 California Independent System Operator Corporation Order Addressing Arguments Raised on Rehearing and Granting Clarification
EL22-62-000 07/28/22 California Independent System Operator Corporation Proposed Revisions to Credit Practices in Organized Wholesale Electric Markets
ER21-2455-000 06/17/22 California Independent System Operator Corporation Order on Compliance Filing
ER22-1246-000 05/20/22 California Independent System Operator Corporation Order Accepting Tariff Revisions
ER20-1075-002 04/21/22 California Independent System Operator Corporation Order on Remand
Docket No. Date Issued Company Title
EL21-70-000 11/18/21 Luna Valley Solar I, LLC v. Pacific Gas and Electric Company and California Independent System Operator Corporation Order Denying Complaint
EL21-74-000  07/15/21 Nevada Power Company and Sierra Pacific Power Company v. California Independent System Operator Corporation Order Dismissing Complaint
ER04-835-014 06/17/21 California Independent System Operator Corporation Rehearing Work Item 1 of 1 Order Addressing Arguments Raised on Rehearing
EL20-69-001 06/17/21 CAlifornians for Renewable Energy, et al. v. California Independent System Operator Corporation, et al. EL20-69-001. Rehearing 1 of 1 Order Addressing Arguments Raised on Rehearing
EL00-95-291 05/20/21 San Diego Gas & Electric Company v. Sellers of Energy and Ancillary Services Order Accepting Settlement Overlay Compliance Filing
EL00-95-310 05/20/21 San Diego Gas & Electric Company v. Sellers of Energy and Ancillary Services Order Addressing Arguments Raised On Rehearing
EL00-95-301 05/20/21 San Diego Gas & Electric Company v. Sellers of Energy and Ancillary Services Order Addressing Arguments Raised on Rehearing
ER21-395-000  04/15/21 California Independent System Operator Corporation Order Dismissing Waiver Requests
EL20-69-000 03/18/21 CAlifornians for Renewable Energy, et al. v. California Independent System Operator Corporation, et al. Order Denying Complaint and Notice of Intent Not to Act

This page was last updated on June 25, 2025