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

ER24-155-000

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
Docket No. Date Issued Company Title
ER20-2890-000 11/19/20 California Independent System Operator Corporation Letter Order Accepting Tariff Revisions
ER20-2604-000 10/15/20 California Independent System Operator Corporation. Letter Order Granting Distribution of Interconnection Study Proceeds
ER20-1890-000 09/17/20 California Independent System Operator Corporation Order Accepting Tariff Revisions Subject to Condition
EL14-37-000  07/16/20 California Independent System Operator Corporation Order on Compliance
ER19-468-002 07/16/20 California Independent System Operator Corporation Order on Compliance Filing
ER19-2347-001 06/18/20  California Independent System Operator Corporation  Order Denying Rehearing and Granting Clarification 
ER19-538-001 02/20/20 California Independent System Operator Corporation Order Denying Rehearing
ER19-1950-000 02/20/20 California Independent System Operator Corporation Order on Compliance
Docket No. Date Issued Company Title
ER19-468-000  11/21/19 California Independent System Operator Corp Order on Compliance Filing
EL18-177-001  10/17/19 CXA La Paloma, LLC v. California Indep. Sys. Operator Corp., Order Denying Rehearing
EL19-81-000  10/17/19 Nevada Hydro Company, Inc. v. California Independent System Operator Corporation Order Denying Complaint
ER18-1169-002  02/21/19 California Independent System Operator Corporation Order on Rehearing
ER19-308-000  02/21/19 California Independent System Operator Corporation Order Granting Petition
ER19-538-000 02/21/19 California Independent System Operator Corporation Order on Tariff Revisions
Docket No. Date Issued Company Title
ER18-1169-000 06/21/18 California Independent System Operator Corporation Order Accepting in Part, Subject to Condition, and Rejecting in Part, Proposed Tariff Revisions
ER17-1459-000, ER06-615-000, ER02-1656-027, ER02-1656-029, ER02-1656-030, ER02-1656-031 01/18/18 California Independent System Operator Corporation Order Accepting Compliance Filing
ER18-1-000, ER18-1-001  01/18/18 California Independent System Operator Corporation Order Accepting Tariff Revisions
Docket No. Date Issued Company Title
ER17-411-000 01/19/17 California Independent System Operator Corporation Letter Order Accepting, Subject to Condition, CAISO’s Agreement to Procure Transferred Frequency Response From The City of Seattle, By and Through Its City Light Department
ER17-408-000  01/19/17 California Independent System Operator Corporation Letter Order Accepting, Subject to Condition, CAISO’s Agreement to Procure Transferred Frequency Response From Bonneville Power Administration
Docket No. Date Issued Company Title
ER04-835-000, EL04-103-000, EL14-67-000, ER04-835-007, ER04-835-009, EL04-103-000, & EL04-103-004  10/20/16 California Independent System Operator Corporation
Pacific Gas and Electric Company

v.

California Independent System Operator Corporation
The Alliance for Retail Energy Markets
Shell Energy North America (US), L.P.

v.

California Independent System Operator Corporation
California Independent System Operator Corporation
Pacific Gas and Electric Company

v.

California Independent System Operator Corporation
Order on Informational Refund Report, Complaint, And Informational Filing
ER16-1649-004, -005  10/20/16 California Independent System Operator Corporation Order Granting Petition for Extension Of Limited Waiver and Dismissing Motion for Clarification
ER16-1649-000  06/01/16 California Independent System Operator Corporation Order Accepting Tariff Revisions, Subject To Condition, and Establishing A Technical Conference
ER15-1825-001  03/17/16 California Independent System Operator Corporation Order On Rehearing
ER15-1783-001  01/21/16 California Independent System Operator Corporation Order Granting Clarification
Docket No. Date Issued Company Title
EL15-94-000  12/17/15 Shell Energy North America (US), L.P.

v.

California Independent System Operator Corporation
Order Denying Complaint And Granting Waiver
EL14-22-000  12/17/15 California Independent System Operator Corporation Order On Compliance Filing
ER15-861-006  12/17/15 California Independent System Operator Corporation Order On Compliance Filing
ER15-2588-000  11/19/15 Eastside Power Authority Order Denying Waiver
ER15-2550-000  11/19/15 Rancho Cucamonga Municipal Utility Order Denying Waiver
EL15-47-001  11/19/15 NextEra Desert Center Blythe, LLC

v.

California Independent System Operator Corporation
Order Denying Rehearing
ER15-861-004  11/19/15 California Independent System Operator Corporation Order On Compliance Filing
ER15-2281-000, ER15-2282-001, and ER15-2283-000  11/19/15 Nevada Power Company
Sierra Pacific Power Company
PacifiCorp
Order On Proposed Market-Based Rate Tariff Changes
ER15-2272-000  11/19/15 California Independent System Operator Corporation Order Authorizing Mitigation At Energy Imbalance Market Interties
ER14-2017-001  11/19/15 California Independent System Operator Corporation Order Accepting Compliance Filing
ER15-2623-000 and ER15-2625-000  11/19/15 Nevada Power Company Order Rejecting Proposed Agreements

This page was last updated on July 25, 2024