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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 2023. Filed on November 13, 2024.

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 2023 IRS Form 990 filing, California Independent System Operator Corporation, a 501(c)(3) charitable organization, reported compensation for 24 out of 775 total employees. Among the employees shown here, the average compensation is $636,614. The highest compensated employee at California Independent System Operator Corporation is Elliott Mainzer with fiscal year 2023 compensation of $2,037,207.

Revenue, expenses, and employee compensation

Revenue

$272,540,764

Expenses

$277,699,154

Employee compensation

$174,014,987
Revenue, expenses, and employee compensation over time

Reported Compensated Employees

Elliott Mainzer
President and Chief Executive Officer
$2,037,207
$1,846,626 No related comp$190,581
Mark Rothleder
Senior Vice President and Chief Operating OFF
$1,471,344
$1,277,563 No related comp$193,781
Roger Collanton
Vice President, GEN CNSL and Chief COMP OFF
$1,034,165
$891,866 No related comp$142,299
Ryan Seghesio
Vice President, CFO and Treasurer
$929,047
$796,217 No related comp$132,830
Stacey Crowley
Vice President, External Affairs
$897,848
$786,164 No related comp$111,684
Neil Millar
Vice President, Infrastructure and OPS PLAN
$895,658
$776,411 No related comp$119,247
Jodi Ziemathis
Vice President, Human Resources
$874,331
$739,342 No related comp$134,989
Anna McKenna
Vice President, Market Policy and Performance
$836,401
$712,621 No related comp$123,780
Khaled Abdul-Rahman
Vice President, PWR Systems and Market TECH
$783,506
$667,307 No related comp$116,199
Dede Subakti
Vice President, Systems Operations
$732,537
$623,063 No related comp$109,474
Joanne Serina
Vice President, Stakeholder Engagement
$659,634
$556,924 No related comp$102,710
Anthony Ivancovich
Deputy GEN CNSL - Regulatory
$566,162
$479,897 No related comp$86,265

Benchmark Employee Compensation

Non-Employee Board Members

Ashutosh Bhagwat Thru 022023
Chair, Board of Governors
$23,556
$23,556 No related compNo other comp

Contractors

Siemens Industry Inc.
Engineering
$9,823,822
Open Access Technology International
Consulting
$3,586,117
Corestaff Services
Temporary Staffing
$3,566,371
Teksystems Inc.
Consulting
$2,934,294
Tech-Net Inc.
Consulting
$1,882,431

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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