Pinnacle West Announces Proposed Offering of $450 Million of Convertible Senior Notes Due 2027

Pinnacle West Capital Corp. (NYSE: PNW) (“Pinnacle West”) announced today that it intends to offer, subject to market and other conditions, $450 million aggregate principal amount of its convertible senior notes due 2027 (the “convertible notes”) in a private placement under the Securities Act of 1933, as amended (the “Securities Act”). Pinnacle West also intends to grant the initial purchasers of the convertible notes an option to purchase, within a 13-day period from, and including, the date on which the convertible notes are first issued, up to an additional $67.5 million aggregate principal amount of the convertible notes.

Pinnacle West intends to use the net proceeds from the offering of the convertible notes for general corporate purposes, which may include repayment or refinancing of debt, working capital and investments in its operating subsidiary, Arizona Public Service Company.

The convertible notes will be senior unsecured obligations of Pinnacle West and will be convertible at the option of the holders of such convertible notes upon satisfaction of certain conditions and during certain periods. Interest will be payable semiannually in arrears. Pinnacle West will settle conversions of the convertible notes by paying cash up to the aggregate principal amount of the convertible notes to be converted and paying or delivering, as the case may be, cash, shares of its common stock, no par value, or a combination of cash and shares of its common stock, at its election, in respect of the remainder, if any, of its conversion obligation in excess of the aggregate principal amount of the convertible notes being converted. The interest rate, the initial conversion rate, and other terms of the convertible notes will be determined by negotiations between Pinnacle West and the initial purchasers of the convertible notes.

The offering is being made to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act. Any offers of the convertible notes will be made only by means of a private offering memorandum. None of the convertible notes or any shares of the common stock issuable upon conversion of the convertible notes have been or are expected to be registered under the Securities Act or any state securities laws and, unless so registered, may not be offered or sold in the United States or to U.S. persons except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and applicable state securities laws. No assurance can be made that the offering of the convertible notes will be completed on its anticipated terms, or at all.

This press release does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor will there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

General Information

Pinnacle West Capital Corp., an energy holding company based in Phoenix, has consolidated assets of nearly $25 billion, about 6,500 megawatts of generating capacity and approximately 6,100 employees in Arizona and New Mexico. Through its principal subsidiary, Arizona Public Service Company, the company provides retail electricity service to approximately 1.4 million Arizona homes and businesses.

FORWARD-LOOKING STATEMENTS

This press release may contain statements that constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including statements concerning the timing and completion of the offering of the convertible notes and the anticipated use of proceeds from the offering. These forward-looking statements are often identified by words such as “estimate,” “predict,” “may,” “believe,” “plan,” “expect,” “require,” “intend,” “assume,” “project,” “anticipate,” “goal,” “seek,” “strategy,” “likely,” “should,” “will,” “could,” and similar words. Because actual results may differ materially from expectations, we caution readers not to place undue reliance on these statements. A number of factors could cause future results to differ materially from historical results, or from outcomes currently expected or sought by Pinnacle West or Arizona Public Service Company (“APS”). These factors include, but are not limited to, the factors discussed in the most recent Pinnacle West/APS Form 10-K and 10-Q along with other public filings with the Securities and Exchange Commission, which readers should review carefully before placing any reliance on our financial statements or disclosures. Neither Pinnacle West nor APS assumes any obligation to update these statements, even if our internal estimates change, except as required by law.

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