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Compensation 990 is an independent service that uses public IRS Form 990 filings as its source data. We clean and standardize this information, but the original filings may contain errors or omissions. Years on this site refer to the organization’s fiscal year end date on the filing.

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Organizations Public & Societal Benefit California Independent System Operator Corporation

California Independent System Operator Corporation

Fiscal year ending 2022. Filed on November 10, 2023.

250 Outcropping Way
Folsom, California 95630

California Independent System Operator Corporation (EIN: 94-3274043) has filed an IRS Form 990 since at least fiscal year 2016. In its fiscal year 2022 IRS Form 990 filing, California Independent System Operator Corporation, a 501(c)(3) charitable organization, reported compensation for 25 out of 762 total employees. Among the employees shown here, the average compensation is $576,905. The highest compensated employee at California Independent System Operator Corporation is Elliott Mainzer with fiscal year 2022 compensation of $1,567,293.

Revenue, expenses, and employee compensation

Revenue

$255,713,716

Expenses

$250,885,967

Employee compensation

$151,373,508
Revenue, expenses, and employee compensation over time

Reported Compensated Employees

Elliott Mainzer
President and Chief Executive Officer
$1,567,293
$1,415,890 No related comp$151,403
Mark Rothleder
Senior Vice President and Chief Operating OFF
$1,414,791
$1,219,354 No related comp$195,437
Roger Collanton
Vice President, GEN CNSL and Chief COMP OFF
$964,415
$836,721 No related comp$127,694
Ryan Seghesio
Vice President, CFO and Treasurer
$878,764
$751,376 No related comp$127,388
Neil Millar
Vice President, Infrastructure and OPS PLAN
$856,737
$727,338 No related comp$129,399
Stacey Crowley
Vice President, External Affairs
$828,464
$719,341 No related comp$109,123
Jodi Ziemathis
Vice President, Human Resources
$789,904
$663,678 No related comp$126,226
Anna McKenna
Vice President, Market Policy and Performance
$735,810
$618,396 No related comp$117,414
Khaled Abdul-Rahman
Vice President, PWR Systems and Market TECH
$732,463
$621,542 No related comp$110,921
Dede Subakti
Vice President, Systems Operations
$638,409
$536,737 No related comp$101,672
Joanne Serina
Vice President, Stakeholder Engagement
$541,641
$448,416 No related comp$93,225
Anthony Ivancovich
Deputy GEN CNSL - Regulatory
$534,440
$459,333 No related comp$75,107

Benchmark Employee Compensation

Non-Employee Board Members

No board members were reported during this fiscal year.

Contractors

Siemens Industry Inc.
Engineering
$9,564,106
Open Access Technology International
Consulting
$3,166,270
Corestaff Services
Temporary Staffing
$2,481,070
Teksystems Inc.
Consulting
$2,231,032
Gsg Protective Services
Security
$1,304,522

Mission Statement

TO ENSURE EFFICIENT USE AND RELIABLE OPERATION OF THE ELECTRIC TRANSMISSION GRID OPERATED BY THE CALIFORNIA ISO, CONSISTENT WITH THE CALIFORNIA PUBLIC UTILITY CODE, CHAPTER 2.3 PART 1, DIVISION 1. (CONTINUED ON SCHEDULE O.)THE ISO DOES NOT OWN TRANSMISSION FACILITIES, BUT IT CONTROLS THE OPERATION OF A NETWORK OF TRANSMISSION FACILITIES LOCATED THROUGHOUT MOST OF CALIFORNIA, AND ALSO CERTAIN TRANSMISSION FACILITIES LOCATED IN NEVADA, THE OWNERS OF WHICH HAVE TRANSFERRED OPERATIONAL CONTROL TO THE CALIFORNIA ISO. FOR THE BENEFIT OF OUR CUSTOMERS, WE:- OPERATE THE GRID RELIABLY AND EFFICIENTLY;- PROVIDE FAIR AND OPEN TRANSMISSION ACCESS;- PROMOTE ENVIRONMENTAL STEWARDSHIP; AND- FACILITATE EFFECTIVE MARKETS AND PROMOTE INFRASTRUCTURE DEVELOPMENT, ALL THROUGH THE PROVISION OF TIMELY AND ACCURATE INFORMATION.

Revisions to this organization profile

November 10, 2025:
2024 California Independent System Operator Corporation 990 filed
November 13, 2024:
2023 California Independent System Operator Corporation 990 filed
November 10, 2023:
2022 California Independent System Operator Corporation 990 filed

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