Nonprofit · EIN 94-3274043
CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION
Also known as CALIFORNIA ISO
Tax-exempt · FOLSOM, CA 95630
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2024 | 990 | $285,941,806 | $292,763,479 | -$6,821,673 | $1,523,256,943 | $1,322,508,709 | $200,748,234 |
| December 31, 2023 | 990 | $272,540,764 | $277,699,154 | -$5,158,390 | $1,459,997,265 | $1,247,733,494 | $212,263,771 |
Financial details: 990 for the year ended December 31, 2024
Revenue
- Contributions, gifts and grants
- $0
- Program service revenue
- $272,216,015
- Investment income
- $13,705,254
- Net gain from sales of assets
- $1,621,407
- Other revenue
- $20,537
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $13,559,062
- Other salaries and wages
- $137,161,332
- Salaries, compensation and benefits (total)
- $188,924,516
- Professional fundraising fees
- $0
- Legal fees
- $1,146,707
- Accounting fees
- $720,375
- Occupancy
- $3,400,765
- Travel
- $1,447,063
- Depreciation
- $27,410,257
- Program services (functional)
- $261,286,939
- Management and general (functional)
- $31,476,540
Balance sheet and other
- Total assets, start of year
- $1,459,997,265
- Total assets, end of year
- $1,523,256,943
- Total liabilities, end of year
- $1,322,508,709
- Net assets, end of year
- $200,748,234
- Land, buildings and equipment
- $143,850,705
- Publicly traded securities
- $214,182,256
- Net assets without donor restrictions
- $163,785,141
- Net assets with donor restrictions
- $36,963,093
- Gross receipts
- $499,485,034
- Employees
- 788
- Volunteers
- 0
- Year formed
- 1997
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2024, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| ELLIOTT MAINZER | PRESIDENT & CEO Officer | 40 | $2,088,685 | $220,025 |
| MARK ROTHLEDER | SR VP & CHIEF OPERATING OFF. Officer | 40 | $1,486,414 | $203,465 |
| ROGER COLLANTON | VP, GEN. CNSL. & CHIEF COMP. OFF. Officer | 40 | $900,539 | $153,819 |
| RYAN SEGHESIO | VP, CHIEF FINANCIAL OFF. & TREASURER Officer | 40 | $859,314 | $140,325 |
| STACEY CROWLEY | VP, EXTERNAL AFFAIRS Officer | 40 | $805,977 | $122,204 |
| ANNA MCKENNA | VP, MARKET DESIGN & ANALYSIS Officer | 40 | $786,029 | $140,615 |
| JODI ZIEMATHIS | VP, HUMAN RESOURCES Officer | 40 | $779,475 | $141,211 |
| NEIL MILLAR | VP, INFRASTRUCTURE & OPS PLANNING Officer | 40 | $815,105 | $104,067 |
| KHALED ABDUL-RAHMAN | VP, POWER SYSTEMS & MKT TECHNOLOGY Officer | 40 | $721,409 | $131,540 |
| DEDE SUBAKTI | VP, SYSTEM OPERATIONS Officer | 40 | $656,944 | $118,116 |
| JOANNE SERINA | VP, STAKEHOLDER ENGAGEMENT Officer | 40 | $590,279 | $113,947 |
| BURTON GROSS | DEPUTY GEN. CNSL. - LEGAL Highest-paid employee | 40 | $504,389 | $84,825 |
| JOHN ANDERS | DEPUTY GEN. CNSL. - DEVELOPMENT Highest-paid employee | 40 | $491,857 | $95,319 |
| ERIC HILDEBRANDT | EXEC. DIR., MARKET MONITORING Key employee | 40 | $467,091 | $82,536 |
| ANDREW ULMER | ASSISTANT GEN. CNSL. - FED REG & MKT Highest-paid employee | 40 | $433,352 | $88,315 |
8 more people on this return
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| JOHN PHIPPS | EXECUTIVE DIRECTOR OF GRID OPERATIONS Highest-paid employee | 40 | $426,323 | $78,315 |
| JOE BINSTEIN | MANAGER, BALANCING AUTHORITY OPERATIONS Highest-paid employee | 40 | $415,671 | $73,306 |
| HUGO FRECH | EXEC DIR., IT IFS. ARC. & INFO SEC. Key employee | 40 | $415,874 | $64,056 |
| ANGELINA GALITEVA | BOARD OF GOVERNORS Trustee or director | 8 | $93,000 | $0 |
| MARY LESLIE | BOARD OF GOVERNORS Trustee or director | 8 | $92,500 | $0 |
| JOSEPH ETO | VICE CHAIR Trustee or director | 8 | $91,500 | $0 |
| SEVERIN BORENSTEIN | CHAIR Trustee or director | 8 | $89,500 | $0 |
| JAN SCHORI | BOARD OF GOVERNORS Trustee or director | 8 | $83,500 | $0 |
990 for the year ended December 31, 2023: 25 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| ELLIOTT MAINZER | PRESIDENT & CEO Officer | 40 | $1,846,626 | $190,581 |
| MARK ROTHLEDER | SR. VP & CHIEF OPERATING OFF Officer | 40 | $1,277,563 | $193,781 |
| ROGER COLLANTON | VP, GEN CNSL & CHIEF COMP. OFF Officer | 40 | $891,866 | $142,299 |
| RYAN SEGHESIO | VP, CFO & TREASURER Officer | 40 | $796,217 | $132,830 |
| STACEY CROWLEY | VP, EXTERNAL AFFAIRS Officer | 40 | $786,164 | $111,684 |
| NEIL MILLAR | VP, INFRASTRUCTURE & OPS PLAN Officer | 40 | $776,411 | $119,247 |
| JODI ZIEMATHIS | VP, HUMAN RESOURCES Officer | 40 | $739,342 | $134,989 |
| ANNA MCKENNA | VP, MARKET POLICY AND PERFORMANCE Officer | 40 | $712,621 | $123,780 |
| KHALED ABDUL-RAHMAN | VP, PWR SYSTEMS & MARKET TECH Officer | 40 | $667,307 | $116,199 |
| DEDE SUBAKTI | VP, SYSTEMS OPERATIONS Officer | 40 | $623,063 | $109,474 |
| JOANNE SERINA | VP, STAKEHOLDER ENGAGEMENT Officer | 40 | $556,924 | $102,710 |
| ANTHONY IVANCOVICH | DEPUTY GEN. CNSL. - REGULATORY Highest-paid employee | 40 | $479,897 | $86,265 |
| BURTON GROSS | DEPUTY GENERAL COUNSEL - LEGAL Highest-paid employee | 40 | $475,345 | $77,219 |
| JOHN ANDERS | ASST GENERAL COUNSEL - LEGAL Highest-paid employee | 40 | $448,976 | $93,670 |
| ERIC HILDEBRANDT | EXEC. DIR., MARKET MONITORING Key employee | 40 | $470,277 | $67,648 |
| ANDREW ULMER | ASST GEN. CNSL. - FED REG & MKT Highest-paid employee | 40 | $411,356 | $77,996 |
| HANI ALARIAN | EXEC. DIR., POWER SYSTEM TECH. OPERAT Highest-paid employee | 40 | $392,672 | $79,557 |
| HUGO FRECH | EXEC. DIR, IT IFS ARC & INFOSEC Key employee | 40 | $387,997 | $72,645 |
| STEPHEN BERBERICH | CEO EMERITUS Former | 40 | $121,540 | $0 |
| SEVERIN BORENSTEIN | BOARD OF GOVERNORS Trustee or director | 8 | $86,500 | $0 |
| JAN SCHORI | BOARD OF GOVERNORS Trustee or director | 8 | $86,500 | $0 |
| ANGELINA GALITEVA | BOARD OF GOVERNORS Trustee or director | 8 | $84,500 | $0 |
| MARY LESLIE | BOARD OF GOVERNORS Trustee or director | 8 | $73,500 | $0 |
| JOSEPH ETO | BOARD OF GOVERNORS Trustee or director | 8 | $53,000 | $0 |
| ASHUTOSH BHAGWAT THRU 022023 | CHAIR, BOARD OF GOVERNORS Trustee or director | 8 | $23,556 | $0 |
Address and contacts
- Address (IRS master file)
- 250 OUTCROPPING WAY, FOLSOM, CA 95630-8773
- In care of
- % DENNIS ESTRADA
- Principal officer (990 for 2024)
- ELLIOT MAINZER, 250 OUTCROPPING WAY, FOLSOM, CA 95630
- Signed the 990
- RYAN SEGHESIO, VP, CFO & TREASURER
- Phone
- (916) 351-4400
- Website
- WWW.CAISO.COM
- Return prepared by
- BAKER TILLY ADVISOR GROUP LP
California records
California keeps its own records of charities and corporations. Search them by EIN 94-3274043 or by the name CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
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.
Program accomplishments
- THE ORGANIZATION SERVES AS THE SYSTEM OPERATOR OF AN INTEGRATED STATEWIDE ELECTRICITY TRANSMISSION GRID.Expenses $261,286,939 · revenue $272,236,552
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 94-3274043
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Supporting organization (509(a)(3))
- Donations deductible (Pub 78)
- Supporting organization of unknown type
- Exempt since
- 1998
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Public and societal benefit (W99)
- Assets (IRS master file)
- $1,523,256,943
- Income (IRS master file)
- $499,485,034
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2024 | $285,941,806 | $292,763,479 | $1,523,256,943 | XML |
| 990 | December 2023 | $272,540,764 | $277,699,154 | $1,459,997,265 | XML |
| 990 | December 2022 | $255,713,716 | $250,885,967 | $1,587,900,049 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990-T | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990-T | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
| 990 | December 2017 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 94-3274043).
Questions about CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION
- What is the EIN of CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION?
- The employer identification number (EIN) of CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION is 94-3274043.
- Is CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1998.
- Are donations to CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION tax-deductible?
- Yes. It is listed in IRS Publication 78 (Supporting organization of unknown type).
- Which annual return does CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION due?
- The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2024.
- Who is the principal officer of CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION?
- The 990 for the year ended December 31, 2024 names ELLIOT MAINZER.
- Who are the officers and directors of CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION?
- The 990 for the year ended December 31, 2024 lists 23 people; 23 received compensation from the organization, the highest $2,088,685 (ELLIOTT MAINZER, PRESIDENT & CEO).
- How much revenue does CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION have?
- On its 990 for the year ended December 31, 2024 it reported revenue of $285,941,806, expenses of $292,763,479 and total assets of $1,523,256,943 at year end.
Other nonprofits in FOLSOM
- FOLSOM POLICE FOUNDATION EIN 46-5088936 · last filed 990 for 2025
- VETERANS OF FOREIGN WARS DEPARTMENT OF CALIFORNIA EIN 23-7115049 · last filed 990 for 2026
- ASSOCIATION OF CALIFORNIA WATER AGENCIES FOUNDATION EIN 92-0785873 · last filed 990-EZ for 2025
- VETERANS GOLF PROGRAM EIN 81-1720496 · last filed 990-EZ for 2025
- WARFIGHTER OVERWATCH EIN 85-4162946 · last filed 990-EZ for 2025
- AMERICANS AGAINST GUN VIOLENCE EIN 81-1741008 · last filed 990-EZ for 2025
- SCIENCE 2 0 CORP EIN 82-4959054 · last filed 990-EZ for 2024
- ROLLING HILLS BLUE STAR MOMS EIN 32-0330742 · last filed 990-N for 2025
All nonprofits in FOLSOM · California · Public and societal benefit