CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION Charity Report

Public IRS 990 nonprofit record

CALIFORNIA INDEPENDENT SYSTEM OPERATOR CORPORATION

EIN 94-3274043 · Public & Societal Benefit N.E.C. (W99)

What they do

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.

Before you give

Should I give to this charity?

Easy charity check

Look at where the money went

Of every $100 spent, about $89.20 was reported for mission work. Use the spending picture below and ask what results that work produced.

Plain answer: A tax form cannot prove that a charity is doing good. It can show how the charity says it spent its money—and point out questions you should ask.

Basic facts we verified

IRS warning checkNo IRS revocation warning appears in this data.

Money report from 2024The charity has a recent tax report to read.

They explain their jobThe charity tells us what it is trying to do.

They name their leaders23 people are listed in the latest report.

You can reach themThey list contact information, so you can ask questions.

Money made simple

91.38%of revenue went to mission work89.2% of expenses · Program services

$102.39spent for every $100 of revenueSpending was higher than revenue this year.

11.01%of revenue went to management and office costs10.8% of expenses

$5.20in assets for every $1 spent this yearSome assets cannot be spent right away.

Ask these three easy questions

Who did you help? Ask for a recent story or report that shows real results.
What will my money do? Ask exactly what your gift will pay for.
Is this really the charity? Give only through its official website or confirmed phone number.

Worth asking: Expenses exceeded revenue by $6,821,673 this year. Ask whether that was planned or caused by a one-time event.

Pay context: The highest compensation shown in this filing is $2,308,710 for ELLIOTT MAINZER (PRESIDENT & CEO). Compare pay with organizations of similar size and complexity.

Bottom line: Do not decide from a name, mission statement, or tax status alone. Look at where the money went, then ask what changed, who was helped, and what your gift will do. YouCanGiveBack does not endorse or grade organizations.

Money

Financial picture

Tax year 2024

A plain-language look at the latest Form 990 figures available. These numbers help you ask better questions; they do not, by themselves, rate whether a charity is good or bad.

$100revenue

How each $100 of revenue was used

The large number compares each expense with revenue. The smaller number shows its share of total expenses.

Total reported revenue$285,941,806

Mission workProgram services$261,286,93991.38% of revenue89.2% of expenses

ManagementOffice and general costs$31,476,54011.01% of revenue10.8% of expenses

FundraisingAsking for donations0.00% of revenue0.0% of expenses

Total expenses$292,763,479102.39% of revenue

Expenses were greater than revenue, so the colored ring fills the available $100 and the total above 100% is shown below.

Has the pattern changed?

Colored bars = expense mix: how each year’s expenses were divided. Total expenses vs. revenue shows whether the charity spent less or more than it received. The current filing is first.

YearExpense mixDetails

2024CurrentExpense mix: 89.2% mission · 10.8% management · 0.0% fundraisingTotal expenses: 102.39% of revenue

2023Expense mix: 89.4% mission · 10.6% management · 0.0% fundraisingTotal expenses: 101.89% of revenue

2022Expense mix: 89.1% mission · 10.9% management · 0.0% fundraisingTotal expenses: 98.11% of revenue

2021Expense mix: 88.5% mission · 11.5% management · 0.0% fundraisingTotal expenses: 91.92% of revenue

2020Expense mix: 88.3% mission · 11.7% management · 0.0% fundraisingTotal expenses: 89.77% of revenue

2019Expense mix: 88.1% mission · 11.9% management · 0.0% fundraisingTotal expenses: 93.21% of revenue

2018Expense mix: 89.0% mission · 11.0% management · 0.0% fundraisingTotal expenses: 97.28% of revenue

2017Expense mix: 88.8% mission · 11.2% management · 0.0% fundraisingTotal expenses: 90.78% of revenue

Money in and money out

Revenue$285,941,806

Expenses$292,763,479

Annual shortfall $6,821,673 Expenses were higher than revenue for this filing year.

Reported spending amounts

Mission work means the Form 990 category called program services. These are reported accounting categories—not an independent measurement of results.

Mission work (program services)$261,286,939 · 89.2% of expenses

Management and office costs$31,476,540 · 10.8% of expenses

See all reported dollar amounts

Revenue$285,941,806

Expenses$292,763,479

Assets$1,523,256,943

Income$499,485,034

Mission work (program services)$261,286,939

Management and general$31,476,540

Executive compensation (total)$10,914,010

Stocks and bonds$214,182,256

Accounting fees$720,375

People

Leadership and board

Tax year 2024

Names, titles, time, and compensation below are reported by the organization on its Form 990.

People reported as paid

Person and titleCompensation

ELLIOTT MAINZERPRESIDENT & CEO · 40 hrs/week $2,308,710Base $2,088,685 · Other $220,025

MARK ROTHLEDERSR VP & CHIEF OPERATING OFF. · 40 hrs/week $1,689,879Base $1,486,414 · Other $203,465

ROGER COLLANTONVP, GEN. CNSL. & CHIEF COMP. OFF. · 40 hrs/week $1,054,358Base $900,539 · Other $153,819

RYAN SEGHESIOVP, CHIEF FINANCIAL OFF. & TREASURER · 40 hrs/week $999,639Base $859,314 · Other $140,325

STACEY CROWLEYVP, EXTERNAL AFFAIRS · 40 hrs/week $928,181Base $805,977 · Other $122,204

ANNA MCKENNAVP, MARKET DESIGN & ANALYSIS · 40 hrs/week $926,644Base $786,029 · Other $140,615

JODI ZIEMATHISVP, HUMAN RESOURCES · 40 hrs/week $920,686Base $779,475 · Other $141,211

NEIL MILLARVP, INFRASTRUCTURE & OPS PLANNING · 40 hrs/week $919,172Base $815,105 · Other $104,067

KHALED ABDUL-RAHMANVP, POWER SYSTEMS & MKT TECHNOLOGY · 40 hrs/week $852,949Base $721,409 · Other $131,540

DEDE SUBAKTIVP, SYSTEM OPERATIONS · 40 hrs/week $775,060Base $656,944 · Other $118,116

JOANNE SERINAVP, STAKEHOLDER ENGAGEMENT · 40 hrs/week $704,226Base $590,279 · Other $113,947

BURTON GROSSDEPUTY GEN. CNSL. - LEGAL · 40 hrs/week $589,214Base $504,389 · Other $84,825

Compensation alone does not tell whether pay is reasonable. Consider the charity’s size, work, location, and results.

See everyone listed on the board or leadership roster (23)

ELLIOTT MAINZERPRESIDENT & CEO

MARK ROTHLEDERSR VP & CHIEF OPERATING OFF.

ROGER COLLANTONVP, GEN. CNSL. & CHIEF COMP. OFF.

RYAN SEGHESIOVP, CHIEF FINANCIAL OFF. & TREASURER

STACEY CROWLEYVP, EXTERNAL AFFAIRS

ANNA MCKENNAVP, MARKET DESIGN & ANALYSIS

JODI ZIEMATHISVP, HUMAN RESOURCES

NEIL MILLARVP, INFRASTRUCTURE & OPS PLANNING

KHALED ABDUL-RAHMANVP, POWER SYSTEMS & MKT TECHNOLOGY

DEDE SUBAKTIVP, SYSTEM OPERATIONS

JOANNE SERINAVP, STAKEHOLDER ENGAGEMENT

BURTON GROSSDEPUTY GEN. CNSL. - LEGAL

JOHN ANDERSDEPUTY GEN. CNSL. - DEVELOPMENT

ERIC HILDEBRANDTEXEC. DIR., MARKET MONITORING

ANDREW ULMERASSISTANT GEN. CNSL. - FED REG & MKT

JOHN PHIPPSEXECUTIVE DIRECTOR OF GRID OPERATIONS

JOE BINSTEINMANAGER, BALANCING AUTHORITY OPERATIONS

HUGO FRECHEXEC DIR., IT IFS. ARC. & INFO SEC.

ANGELINA GALITEVABOARD OF GOVERNORS

MARY LESLIEBOARD OF GOVERNORS

JOSEPH ETOVICE CHAIR

SEVERIN BORENSTEINCHAIR

JAN SCHORIBOARD OF GOVERNORS

About this charity

Recognized since: January 1998
Location: 250 OUTCROPPING WAY, FOLSOM, CA 95630-8773
County: Sacramento
In care of: % DENNIS ESTRADA
Primary officer: RYAN SEGHESIO, VP, CFO & TREASURER

How to reach them

WebsiteVisit the charity’s website Emailmahmadi@caiso.com Phone(916) 351-4400

Filing and classification

Latest tax year: 2024
Tax period began: January 1, 2024
Return type: 990
Tax preparer: BAKER TILLY ADVISOR GROUP LP
NTEE classification: Public & Societal Benefit N.E.C. (W99)
IRS tax category: Public & Societal Benefit N.E.C.