Sustainability Performance

This report relating to UNS Energy Corporation and its subsidiaries Tucson Electric Power Company (“TEP”), UniSource Energy Services, Inc. UNS Electric, Inc. and UNS Gas, Inc. (collectively “we”, “us” or “our”), contains forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. We are including the following cautionary statements to make applicable and take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 for any forward-looking statements made by us in this report. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events, future economic conditions, future operational or financial performance and underlying assumptions, and other statements that are not statements of historical facts. Forward-looking statements may be identified by the use of words or phrases that include "anticipates," "believes," "estimates," "expects," "intends," "continues," "assumes," "aspires," "may," "plans," "predicts," "projects," "would," "could," "forecast," "target," "goal," "potential," "commitment," "strategy," "will," and similar expressions. From time to time, we may publish or otherwise make available forward-looking statements of this nature. All such forward-looking statements, whether written or oral, and whether made by or on behalf of us, are expressly qualified by these cautionary statements and any other cautionary statements which may accompany such forward-looking statements. In addition, we disclaim any obligation to update any forward-looking statements to reflect events or circumstances after the date of this report, except as may otherwise be required by the federal securities laws.

Forward-looking statements involve risks and uncertainties which could cause actual results or outcomes to differ materially from those expressed herein. We express our estimates, expectations, beliefs, aspirations, and projections in good faith and believe them to have a reasonable basis. However, we make no assurances that management’s estimates, expectations, beliefs, aspirations, or projections will be achieved or accomplished. We have identified the following important factors that could cause actual results to differ materially from those discussed in our forward-looking statements. These may be in addition to other factors and matters discussed in: Part I, Item 1A. Risk Factors of TEP’s 2025 Annual Report on Form 10-K (“Annual Report”); Part II, Item 1A. Risk Factors of TEP’s Quarterly Reports on Form 10-Q (“Quarterly 10-Q Reports”); Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations of TEP’s Annual Report and Quarterly 10-Q Reports; our other filings with the Securities and Exchange Commission; and other parts of this report. These factors include: voter initiatives and federal, state, and local regulatory and legislative decisions and actions, including changes in tax, tariff, and energy policies (including, among other things, data center energy use, efficiency standards, and sources of power), as they may be affected by the policies and priorities of governmental officials at the federal, state, and local levels; the outcome of the November 2026 general election vote on TEP’s new franchise agreement with the City of Tucson; any change in the structure of utility service in Arizona resulting from the Arizona Corporation Commission's (“ACC”) or state legislature's examination of the state's energy policies or the City of Tucson's study of municipalization; changes in, and compliance with, environmental laws and regulatory decisions and policies that could increase operating and capital costs, reduce generation facility output, or accelerate generation facility retirements; unfavorable rulings, penalties, or findings by the Federal Energy Regulatory Commission; regional economic and market conditions that could affect customer growth and electricity usage; potential changes in the benefits of participation in the Western Energy Imbalance Market and Southwest Power Pool Markets+; changes in electricity consumption by retail customers; risks related to climate change, including shifts in weather seasonality, extreme weather events, and their increasing frequency and severity, and wildfires, affecting electricity usage of our customers, operational performance, and operating and capital costs to ensure system reliability; our forecasts of peak demand and whether existing generation capacity and purchase power agreements are sufficient to meet the demand plus reserve margin requirements; our ability to implement successfully our business strategies, including any impediments to implementing such strategies arising from state or local opposition, and meet the growing demand for electricity, particularly in view of potential for new large customer requirements; the ability and willingness of our large customer counterparties, including counterparties to data center energy supply agreements, to satisfy their financial and performance commitments; the cost of debt and equity capital and access to capital markets and bank markets during extended periods of volatility, which may affect our ability to raise additional capital and to use the proceeds from any capital that we do raise as originally intended; the performance of the stock market and changes in interest rates, which affect the value of our pension and other postretirement benefit plan assets and related contribution requirements and expenses; our ability to manage timelines and budgets and to access necessary materials and labor, in each case, related to capital projects, including engineering, procurement and construction agreements to develop standalone battery energy storage facilities, and/or to obtain the anticipated performance or other benefits of such capital projects; the potential inability to make additions to our existing high voltage transmission system; unexpected increases in operations and maintenance expense, including increases due to inflationary pressures, tariffs, international trade policy, heightened geopolitical instability, and/or global supply chain challenges; resolution of pending litigation matters; changes in accounting standards; changes in our critical accounting estimates; the ongoing impact of mandated energy efficiency and distributed generation initiatives and the potential repeal of such mandates; our ability to meet our aspirational goal related to reducing carbon emissions by 2050 due to load growth required by potential new large customers, and the potential impact on our financial condition; our ability to exit all ownership interests in coal-fired generation by 2032; changes to long-term contracts; the cost of fuel and power supplies; fluctuations or increases in commodity prices; the ability to obtain coal or natural gas from our suppliers; the timing and cost of generation facility decommissioning and mine reclamation activities; cyber-attacks, data breaches, or other cyberspace attacks to our information security and our operations and technology infrastructure, including attacks that may arise from heightened geopolitical instability or due to the evolution of artificial intelligence or otherwise, as well as additional exposure to data breaches, algorithmic bias and legal liability resulting from the government actions taken in response thereto; the implementation of TEP’s and UNS Electric’s respective 2023 Integrated Resource Plans; and our ability to obtain ACC approval of a formula rate plan with acceptable terms in response to TEP’s 2025 rate case.