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

Updated: April 2026



Performance Metrics

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

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Air +

2021 2022 2023 2024 2025
Emissions From APS-Owned Generation
CO2 (metric tons) ⓘ Carbon dioxide emitted from APS-Owned generation. 11,248,266 12,553,688 10,546,113 10,892,401 10,179,459
SO2 (tons) ⓘ Sulfur dioxide emitted from APS-Owned generation. 2,326 2,504 2,090 1,776 1,478
NOX (tons) ⓘNitrogen oxide emitted from APS-owned generation. 5,496 6,022 4,634 4,398 3,021
PM10 (tons) ⓘParticulate matter emitted from APS-owned generation. 478 510 370 366 402
Hg (tons) ⓘMercury emitted from APS-owned generation. 0.070 0.079 0.055 0.024 0.021
CO (tons) ⓘCarbon monoxide emitted from APS-owned generation. 1,482 1,780 1,480 1,517 1,105
Pb (tons) ⓘLead emitted from APS-owned generation. 0.030 0.033 0.028 0.057 0.060
VOC (tons) ⓘVolatile organic compounds emitted from APS-owned generation. 57 47 51 44 35
Emission Rate From APS-Owned Generation
CO2 (lb/MWh) ⓘCarbon dioxide emissions per MWh from APS-owned generation. 971 1,008 922 927 862
SO2 (lb/MWh) ⓘSulfur dioxide emissions per MWh from APS-owned generation. 0.182 0.182 0.166 0.137 0.114
NOX (lb/MWh) ⓘNitrogen oxide emissions per MWh from APS-owned generation. 0.431 0.439 0.367 0.340 0.232
PM10 (lb/MWh) ⓘParticulate matter emissions per MWh from APS-owned generation. 0.038 0.037 0.029 0.028 0.031
Hg (lb/GWh) ⓘMercury emitted emissions per GWh from APS-owned generation. 0.005 0.006 0.004 0.002 0.002
CO (lb/MWh) ⓘCarbon monoxide emissions per MWh from APS-owned generation. 0.116 0.130 0.117 0.117 0.085
Pb (lb/GWh) ⓘLead emissions per GWh from APS-owned generation. 0.002 0.002 0.002 0.004 0.005
VOC (lb/MWh) ⓘVolatile organic compound emissions per MWh from APS-owned generation. 0.004 0.003 0.004 0.003 0.003
Carbon and Greenhouse Gas Reporting
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. 11,329,468 12,665,061 10,628,383 10,975,406 TBA
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. 112,162 91,739 165,717 158,087 TBA

Communities +

2021 2022 2023 2024 2025
Total Giving ⓘTotal amount donated to worthwhile causes. $12,900,000 $14,700,000 $10,230,052 $10,349,169 $10,652,171
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 $4,054,726
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 $2,502,922
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 $2,481,533
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 $993,698
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 $230,134
Total Giving - Environmental ⓘTotal amount donated to charitable environmental organizations and causes in the calendar year. $359,966 $329,472 $296,134 $355,975 $275,653
Total Giving - Other ⓘTotal amount donated to other charitable organizations and causes in the calendar year. $272,314 $28,893 $468,144 $67,344 $113,485
Volunteer Hours ⓘEstimated number of hours employees volunteer in the community. 91,000 83,500 79,286 95,669 86,941
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 $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 400 Over 250 152 157 205

Customers +

2021 2022 2023 2024 2025
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. $52,499,258 $57,475,148 $69,343,851 $69,021,393 $82,571,648
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. 319,328 354,153 408,644 425,092 537,486
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. 271 322 334 336 323
Energy Support Program Enrollment ⓘThe number of customers enrolled in Energy Support programs at the end of each year. 84,600 74,600 76,860 82,000 85,032
Energy Support Program Funding ⓘAmount funded for Energy Support program to give qualified limited-income customers a discount on their bill each month. $34,148,000 $33,040,000 $19,400,000 $45,855,000 $56,229,429
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 $2,500,000
*Includes shareholder funds distributed to customers that were funded in a prior year.

Electric Reliability +

2021 2022 2023 2024 2025
System Average Interruption Duration Index (SAIDI) ⓘ Average duration of planned and unplanned system interruptions per utility customer served during the data year in minutes. Excludes major event days. 87.36 84.05 82.07 87.20 73.09
System Average Interruption Frequency Index (SAIFI) ⓘIndicates average number of interruptions a customer experiences in a given year. Excludes major event days. 0.89 0.89 0.81 0.93 0.84
Customer Average Interruption Duration Index (CAIDI) ⓘ Average duration of planned and unplanned interruptions (i.e., average restoration time) during the data year in minutes. Excludes major event days. 97.93 94.23 101.32 94.26 86.83

Environmental Violations +

2021 2022 2023 2024 2025
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 6 4 4 5
Environmental Notices of Violation ⓘA notice received from a regulatory agency that a violation of an environmental law, regulation, or permit has occurred. 1 2 0 2 1
Environmental Fines ⓘTotal amount paid for non-compliance events/violations in connection with regulation enforcement actions. $1,979 $4,237 $0 $2,319 $0

Generation +

2021 2022 2023 2024 2025
Total Energy Sources (MWh) ⓘIncludes total generation production and purchased power. 34,076,000 36,028,000 36,822,000 38,833,000 40,423,000
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. 2,695,395 2,558,340 2,504,507 2,426,516 2,408,212

Safety +

2021 2022 2023 2024 2025
OSHA Recordable Injuries or Illness Cases ⓘTotal number of employees who sustained an OSHA recordable injury. 53 27 39 35 34
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). 0.89 0.46 0.63 0.58 0.54
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)" 0.79 0.41 0.50 0.33 0.44
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) 0.55 0.27 0.33 0.21 0.30
Serious Injury or Fatality ⓘAny injury an employee sustains resulting in a fatality; life threatening injury or illness; or life-altering injury/permanent disability. 7 3 8 0 1
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

Waste +

2021 2022 2023 2024 2025
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. 18,024,527 23,360,585 19,624,095 19,546,761 18,331,357
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. 33% 55% 70% 77% 56%
Coal Ash
Coal Ash Generated (tons) ⓘTotal ash (bottom and fly) produced by Four Corners and Cholla Power Plants. 1,022,843 1,253,253 937,855 1,011,040 960,246
Coal Ash Diverted From Landfill (tons) ⓘCoal ash produced and is then sold by Four Corners and Cholla Power Plants. 164,923 206,960 258,849 410,014 348,581
Coal Ash Beneficially Used (%) ⓘPercent of coal ash from Four Corners and Cholla Power Plants beneficially used. 16% 17% 28% 41% 36%
Radioactive Waste
Low-Level radioactive Waste (cubic feet) ⓘLow-level radioactive waste from Palo Verde Nuclear Generating Station. 27,200 21,030 26,100 33,640 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. 3.87 3.58 5.24 4.00 3.11
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. 0.00 57.20 13.84 7.52 0.00
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. 70 75 47 40 41
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. 28,772 17,960 12,817 8,077 11,348

Water +

2021 2022 2023 2024 2025
Water Usage For Generation At APS-Owned & Operated Plants
Groundwater (acre-feet) ⓘTotal groundwater consumed at APS-owned and operated generation plants. 13,009 12,979 12,073 11,680 10,188
Surface Water (acre-feet) ⓘTotal surface water consumed at APS-owned and operated generation plants. 15,027 19,513 17,696 18,945 12,881
Treated Effluent (acre-feet) ⓘTotal treated effluent, reclaimed water, consumed at APS-owned and operated generation plants. 75,853 75,441 72,492 71,782 72,561
Total Water (acre-feet) ⓘTotal water consumed at APS-owned and operated generation plants. 103,889 106,744 102,114 101,342 95,629
Intensity (gal/MWh) ⓘTotal water consumed per net MWh generated at APS-owned and operated generation plants. 663 651 668 646 639

Workforce +

2021 2022 2023 2024 2025
Total Veteran Employees % ⓘPercent of veteran employees in the reporting year. 16.1% 15.0% 13.9% 14.8% 13.9%
Employee Tenure (years) ⓘAverage length of time an employee has maintained employment at the company. 12.77 12.57 11.60 11.29 10.89
Total Employee Turnover % ⓘPercent of employees that leave the company in the reporting year. 9.9% 11.0% 8.1% 7.1% 7.1%
Turnover Related to Retirements % ⓘPercent of employees that retire from the company in a reporting year. 4.1% 3.6% 2.7% 2.1% 2.8%
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. 85% 83% 85% 86% 86%
Average Number Of Employees ⓘThe mathematical average of the number of employees over the calendar year. 6,008 5,842 5,900 6,245 6,456
Union Employees ⓘNumber of employees belonging to IBEW union. 1,245 1,201 1,135 1,122 1,128
Total Hours Training ⓘIncludes hours tracked through HR software spent learning skills related to job function and leadership development/career enhancement. 95,123 77,618 59,332 101,509 *155,316
*2025 Parameters for counting training hours changed due to new software for training being adopted.

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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