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Metrics-and-Reporting
Performance Metrics | Reports | Corporate Policies and Codes of Conduct | Forward-Looking Statements

Updated: April 2025



Performance Metrics

We use a number of sustainability performance indicators to measure progress and hold ourselves accountable. Find our most recent data below.

Download the data in Excel

Air +

2020 2021 2022 2023 2024
Emissions From APS Owned Generation
CO2 (metric tons) ⓘ Carbon dioxide emitted from APS-owned generation. 11,147,881 11,248,266 12,553,688 10,546,113 10,892,401
SO2 (tons) ⓘ Sulfur dioxide emitted from APS-owned generation. 1,784 2,326 2,504 2,090 1,775
NOX (tons) ⓘNitrogen oxide emitted from APS-owned generation. 5,102 5,496 6,022 4,634 4,398
PM10 (tons) ⓘParticulate matter emitted from APS-owned generation. 456 478 510 370 366
Hg (tons) ⓘMercury emitted from APS-owned generation. 0.016 0.070 0.079 0.055 0.024
CO (tons) ⓘCarbon monoxide emitted from APS-owned generation. 1,302 1,482 1,780 1,479 1,517
Pb (tons) ⓘLead emitted from APS-owned generation. 0.047 0.030 0.033 0.028 0.057
VOC (tons) ⓘVolatile organic compounds emitted from APS-owned generation. 64 57 47 51 44
Emission Rate From APS Owned Generation
CO2 (lb/MWh) ⓘCarbon dioxide emissions per MWh from APS-owned generation.. 921 971 1,008 922 927
SO2 (lb/MWh) ⓘSulfur dioxide emissions per MWh from APS-owned generation. 0.134 0.182 0.182 0.166 0.137
NOX (lb/MWh) ⓘNitrogen oxide emissions per MWh from APS-owned generation. 0.382 0.431 0.439 0.367 0.340
PM10 (lb/MWh) ⓘParticulate matter emissions per MWh from APS-owned generation. 0.034 0.038 0.037 0.029 0.028
Hg (lb/GWh) ⓘMercury emitted emissions per GWh from APS-owned generation. 0.001 0.005 0.006 0.004 0.002
CO (lb/MWh) ⓘCarbon monoxide emissions per MWh from APS-owned generation. 0.098 0.116 0.130 0.117 0.117
Pb (lb/GWh) ⓘLead emissions per GWh from APS-owned generation. 0.004 0.002 0.002 0.002 0.004
VOC (lb/MWh) ⓘVolatile organic compound emissions per MWh from APS-owned generation. 0.005 0.004 0.003 0.004 0.003
Carbon and Greenhouse Gas Reporting
Carbon Intensity (including the Energy Efficiency and Distributed Generation Amounts) (lb/MWh)ⓘCarbon intensity is the measure of total carbon emissions, measured in pounds per megawatt hour of energy delivered by APS to its customers. It includes total emissions from APS-owned generation and power purchase agreements, as well as megawatt hours from distributed generation and megawatt hours saved from demand-side management. 630 655 714 644 597
Scope 1 Greenhouse Gas Emissions (MT CO2e) ⓘScope 1 includes all direct emissions arising from sources owned or controlled by the reporting entity (e.g., emissions associated with fuel combustion in boilers, furnaces, vehicles). These direct emissions result from activities that physically release greenhouse gases to the atmosphere. 11,257,147 11,329,468 12,665,061 10,628,383 10,975,406
Scope 2 Market-Based Greenhouse Gas Emissions (MT CO2e) ⓘScope 2 includes all indirect emissions associated with electricity, steam, heat, or cooling purchased for use by the reporting entity in its own operations. These indirect emissions occur outside of the organization's reporting boundary and are emitted by power generation sources owned or controlled by another party. Scope 2 also includes indirect emissions associated with T&D line losses from electricity that is not generated by the company transmitting and/or distributing the power. In 2020, we changed boundaries for reporting to account for line losses as stated in the above definition. 116,939 112,162 91,739 165,717 158,087

Communities +

2020 2021 2022 2023 2024
Total Giving ⓘTotal amount donated to worthwhile causes. $11,100,000 $12,900,000 $14,700,000 $10,230,052 $10,349,169
Total Giving - Health and Human Services ⓘTotal amount donated to charitable human services organizations and causes in the calendar year. --- $5,425,186 $5,949,861 $3,166,294 $4,097,564
Total Giving - Community Development ⓘTotal amount donated to charitable community development organizations and causes in the calendar year. --- $1,774,089 $3,537,895 $2,258,201 $1,756,957
Total Giving - Education ⓘTotal amount donated to charitable educational organizations and causes in the calendar year. --- $4,289,727 $3,277,468 $2,722,338 $2,915,798
Total Giving - Arts and Culture ⓘTotal amount donated to charitable arts & culture organizations and causes in the calendar year. --- $752,827 $1,192,819 $882,546 $881,319
Total Giving - Small Business ⓘTotal amount donated to charitable small business organizations and causes in the calendar year. --- $93,400 $386,658 $436,395 $274,212
Total Giving - Environmental ⓘTotal amount donated to charitable environmental organizations and causes in the calendar year. --- $359,966 $329,472 $296,134 $355,975
Total Giving - Other ⓘTotal amount donated to other charitable organizations and causes in the calendar year. --- $272,314 $28,893 $468,144 $67,344
Volunteer Hours ⓘEstimated number of hours employees volunteer in the community. 82,000 91,000 83,500 79,286 95,669
Value of Volunteer Hours ⓘTotal estimated value of Volunteer Hours based on Inspector Sector Reported values by state. --- $2,600,000 $2,500,000 $2,400,000 $3,000,000
Employee Involvement in Community Organizations ⓘNumber of organizations where employees sit on the boards, to include community organizations, nonprofit organizations and industry groups. Over 500 Over 400 Over 250 152 157

Customers +

2020 2021 2022 2023 2024
JD Power Customer Satisfaction Ranking Quartile - Residential ⓘJ.D. Power annual ranking for residential customers. 4th 4th 2nd 2nd 2nd
JD Power Customer Satisfaction Ranking Quartile - Business ⓘJ.D. Power annual ranking for business customers. 2nd 4th 1st 2nd 2nd
Annual Investment in Energy Efficiency Programs ⓘDollars spent on demand-side management (DSM) programs as reported to the Arizona Corporation Commission in the annual DSM progress report and third party verified. $40,803,142 $52,499,258 $57,475,148 $69,343,851 $69,021,393
Annual Energy Efficiency Savings (MWh) ⓘIncludes energy savings generated from customer demand-side management (DSM) programs as reported to the Arizona Corporation Commission in the annual DSM progress report. 585,637 319,328 354,153 408,644 425,092
Annual Energy Efficiency Peak Capacity Savings (MW) ⓘIncludes capacity savings generated from customer demand-side management (DSM) programs as reported to the Arizona Corporation Commission in the annual DSM progress report. 198 271 322 334 336
Energy Support Program Enrollment ⓘThe number of customers enrolled in Energy Support programs at the end of each year. 72,400 84,600 74,600 76,860 82,000
Energy Support Program Funding ⓘAmount funded for Energy Support program to give qualified limited-income customers a discount on their bill each month. $27,707,000 $34,148,000 $33,040,000 $19,400,000 $45,855,000
Crisis Bill Assistance Funding ⓘAmount of funding to help limited-income customers pay their bill if they have experienced a crisis like losing a job. --- --- $2,500,000 $1,100,000 *$3,746,000
*Includes shareholder funds distributed to customers that were funded in a prior year.

Electric Reliability +

2020 2021 2022 2023 2024
SAIDI ⓘ(System Average Interruption Duration Index): Average duration of planned and unplanned system interruptions per utility customer served during the data year in minutes. Excludes major event days. 78.58 87.36 84.05 82.07 87.20
SAIFI ⓘ(System Average Interruption Frequency Index): Indicates average number of interruptions a customer experiences in a given year. Excludes major event days. 0.85 0.89 0.89 0.81 0.93
CAIDI ⓘ(Customer Average Interruption Duration Index): Average duration of planned and unplanned interruptions (i.e., average restoration time) during the data year in minutes. Excludes major event days. 92.65 97.93 94.23 101.32 94.26

Environmental Violations +

2020 2021 2022 2023 2024
Reportable Environmental Incidents ⓘThe number of reports or notices required to be submitted to a regulatory agency due to a violation of an environmental law, regulation, permit or as a result of a spill, release or any unauthorized discharge. 2 2 6 4 4
Environmental Notices of Violation ⓘA notice received from a regulatory agency that a violation of an environmental law, regulation, or permit has occurred. 1 1 2 0 2
Environmental Fines ⓘTotal amount paid for non-compliance events/violations in connection with regulation enforcement actions. $1,832 $1,979 $4,237 $0 $2,319

Generation +

2020 2021 2022 2023 2024
Total Energy Sources (MWh) ⓘIncludes total generation production and purchased power. 33,668,000 34,076,000 36,028,000 36,822,000 38,833,000
Total Renewable Energy (MWh) ⓘIncludes APS-owned solar, purchase power agreements (solar, wind, geothermal, biogas) and distributed energy as reported in the RES annual report. 2,982,329 2,695,395 2,558,340 2,504,507 2,426,516
See our statistical report for more generation data

Safety +

2020 2021 2022 2023 2024
OSHA Recordable Injuries or Illness Cases ⓘTotal number of employees who sustained an OSHA recordable injury. 40 53 27 39 35
Recordable Incident Rate ⓘInjury or illness is recordable if it results in any of the following: death, days away from work, restricted work or transfer to another job, medical treatment beyond first aid, or loss of consciousness. (Number of injuries or illnesses x 200,000 / number of employee labor hours worked). .64 .89 .46 .63 .58
Days Away Restricted and Transfer (DART) ⓘA DART incident is one in which there were one or more lost days or one or more restricted days or one that resulted in an employee transferring to a different job within the company. (Total number of DART incidents x 200,000 / number of employee labor hours worked)" .59 .79 .41 .50 .33
Lost-Time Case Rate ⓘOnly report for employees of the company as defined for the “recordable incident rate for employees” metric. (Number of lost-time cases x 200,000 / number of employee labor hours worked) .37 .55 .27 .33 .21
Serious Injury or Fatality ⓘAny injury an employee sustains resulting in a fatality; life threatening injury or illness; or life-altering injury/permanent disability. 4 7 3 8 0
Work-Related Fatalities ⓘTotal employee fatalities. Record for all employees on our payroll, whether they are labor, executive, hourly, salary, part-time, seasonal or migrant workers. Includes fatalities to those that occur to employees who are not on our payroll if we supervise these employees on a day-to-day basis. 0 0 0 0 0
Near-Miss Frequency Rate ⓘIncident in which no damage or personal injury occurred, but where damage or personal injury easily could have occurred but for a slight circumstantial shift. (Number of Near Miss Events x 200,000 / total hours worked) 1.91 1.93 1.48 1.29 1.00

Waste +

2020 2021 2022 2023 2024
Recycling
Recycled Materials (lbs) ⓘIncludes scrap metal, forestry, small pole & padmount transformers, oil, single stream (co-mingled) recycling, e-waste (including smart meters), and other recycling. As captured through Investment Recovery only. 19,583,316 18,024,527 23,360,585 19,624,095 19,546,761
Diversion Percent ⓘAPS Corporate & Transmission & Distribution measures all non- Hazardous waste and diverted materials to calculate our total waste stream. For the purposes of this metric “diverted” includes waste recycled, repurposed, or otherwise handled so as not to enter a landfill. The tonnage of diverted material as a percentage of the total waste stream is our diversion rate. 31% 33% 55% 70% 77%
Coal Ash
Coal Ash Generated (tons) ⓘTotal ash (bottom and fly) produced by Four Corners and Cholla Power Plants. 1,158,385 1,022,843 1,253,253 937,855 1,011,040
Coal Ash Diverted From Landfill (tons) ⓘCoal ash produced and is then sold by Four Corners and Cholla Power Plants. 583,616 164,923 206,960 258,849 410,014
Coal Ash Beneficially Used (%) ⓘPercent of coal ash from Four Corners and Cholla Power Plants beneficially used. 50% 16% 17% 28% 41%
Radioactive Waste
Low-Level radioactive Waste (cubic feet) ⓘLow-level radioactive waste from Palo Verde Nuclear Generating Station. 30,002 27,200 21,030 26,100 TBA
Hazardous Waste
Non-Episodic Hazardous Waste Generation (tons) ⓘHazardous waste generated at APS owned and operated facilities that is from routine operations & maintenance of facility. 2.3 3.9 3.6 5.2 4.0
Episodic Hazardous Waste Generation (tons) ⓘEpisodic hazardous waste generation attributed to large amounts of hazardous waste generated as the result of non-routine facility operations and unplanned waste events. 5 0 57 14 8
PCB Data
Number Of Pieces ⓘTotal number of PCB containing equipment that is removed from our electrical system for disposal. This equipment may consist of transformers, bushings, capacitors and other electrical components within the transformer, like switches. 85 70 75 47 40
Weight (kilograms) ⓘTotal weight in kilograms of PCB containing equipment that is removed from our electrical system for disposal. This equipment may consist of transformers, bushings, capacitors and other electrical components within the transformer, like switches. 16,388 28,772 17,960 12,817 8,077

Water +

2020 2021 2022 2023 2024
Water Usage For Generation At APS Owned & Operated Plants
Groundwater (acre-feet) ⓘTotal groundwater consumed at APS-owned and operated generation plants. 16,378 13,009 12,979 12,073 11,680
Surface Water (acre-feet) ⓘTotal surface water consumed at APS-owned and operated generation plants. 17,153 15,027 19,513 17,696 18,945
Effluent (acre-feet) ⓘTotal effluent consumed at APS-owned and operated generation plants. 73,543 75,853 75,441 72,492 71,782
Total Water (acre-feet) ⓘTotal water consumed at APS-owned and operated generation plants. 107,074 103,889 106,744 102,114 101,342
Intensity (gal/MWh) ⓘTotal water consumed per net MWh generated at APS-owned and operated generation plants. 659 663 651 668 646

Workforce +

2020 2021 2022 2023 2024
Veteran 17% 16.1% 16.5% 15.5% 14.8%
Employee Tenure (years) ⓘAverage length of time an employee has maintained employment at the company. 12 12 12.77 12.57 11.29
Total Employee Turnover % ⓘPercent of employees that leave the company in the reporting year. 7.5% 9.8% 11% 8% 7.1%
Turnover Related to Retirements % ⓘPercent of employees that retire from the company in a reporting year. 3.7% 4.1% 3.6% 2.7% 2.1%
Employee Engagement Score ⓘReflects the percentage of employees that feel connected to their own success, success of their teams and the organization as measured by a standardized survey. 83% 85% 83% 85% 86%
Average Number Of Employees ⓘThe mathematical average of the number of employees over the calendar year. 6,112 6,008 5,842 5,900 6,245
Union Employees ⓘNumber of employees belonging to IBEW union. --- 1,245 1,201 1,135 1,122
Total Hours Training ⓘIncludes hours tracked through HR software spent learning skills related to job function and leadership development/career enhancement. 246,616 95,123 77,618 59,332 101,509

Reports +

We report annually on our activities to manage climate change risk, energy and greenhouse gas emissions, and water security through CDP. In addition, we participate in the Edison Electric Institute (EEI) environmental, social, and governance reporting template and align to the Task Force on Climate-Related Financial Disclosures (TCFD) framework and Sustainability Accounting Standards Board (SASB) standards for electric utilities.

CDP +

Programme Response Consolidated 2025 CDP 2025 Third Party Verification Programme Response Consolidated 2024 CDP 2024 Third Party Verification Programme Response Water 2023 Programme Response Climate Change 2023 CDP 2023 Third Party Verification Programme Response Water 2022 Programme Response Climate Change 2022 CDP 2022 Third Party Verification Programme Response Water 2021 Programme Response Climate Change 2021 CDP 2021 Third Party Verification

Edison Electric Institute ESG Reporting +

2025 Quantitative Report 2024 Quantitative Report

Sustainability Accounting Standards Board +

SASB 2025 Mapping Report SASB 2024 Mapping Report SASB 2023 Mapping Report SASB 2022 Mapping Report

Task Force on Climate-Related Financial Disclosures +

TCFD 2025 Alignment Report TCFD 2024 Alignment Report TCFD 2023 Alignment Report TCFD 2022 Alignment Report TCFD 2021 Alignment Report

Corporate Policies and Codes of Conduct +

As stewards of Arizona, we are committed to the people and prosperity of our state. The APS promise, and our vision to create a sustainable energy future for Arizona, guides our sustainability initiatives. To ensure our success, we maintain a strong corporate governance structure with policies and practices that support the execution of our strategic priorities to achieve our mission, including those focused on our customers, communities, employees and stakeholders.

Human Rights Policy Safety Policy Political Participation Policy Code of Ethical Conduct Supplier Code of Ethical Conduct Board of Directors Documents and Charters

Forward-Looking Statements +

This report contains forward-looking statements based on current expectations, including statements regarding our earnings guidance and financial outlook and goals. Read full disclaimer.

Forward-Looking Statements

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