Power Solutions International (PSIX) 8-K Power Solutions International Announces Additional $25 Million Shareholder Loan Agreement With Weichai America

Exhibit 99.1

Power Solutions International, Inc.	201 Mittel Drive   Wood Dale, Illinois 60191   www.psiengines.com

Power Solutions International Announces Additional $25 Million Shareholder Loan Agreement With Weichai America

WOOD DALE, Ill., July 20, 2021 — Power Solutions International, Inc. (the “Company” or “PSI”) (OTC Pink: PSIX), a leader in the design, engineering and manufacture of emission-certified engines and power systems, announced today that it entered into an additional shareholder’s loan agreement with its majority stockholder, Weichai America Corp. (“Weichai”), dated as of July 14, 2021 (the “Shareholder’s Loan Agreement”). The Shareholder’s Loan Agreement, which matures on May 20, 2022, provides the Company with access to up to $25 million of credit at the discretion of Weichai to supplement the Company’s working capital. Borrowings under the Shareholder’s Loan Agreement will incur interest at the applicable rate of LIBOR + 4.50% per annum. As of July 15, 2021, PSI has borrowed $15 million under the Shareholder’s Loan Agreement.

Additional details on the Shareholder’s Loan Agreement can be found in the Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 20, 2021.

Lance Arnett, chief executive officer, commented, “We appreciate the continued support that Weichai, our strategic partner and majority stockholder, has provided to us through this additional loan. This added liquidity will help support our business and operational needs as we move forward. As we enter the second half of 2021, we will continue to seek longer term financing options with the assistance of Weichai, while also working closely with them as we monitor our liquidity moving forward.”

Shaojun Sun, chairman of the board, added, “PSI is an important strategic partner to Weichai. We look forward to our continued collaboration together and to supporting and working with PSI as we strive to achieve long-term growth and shareholder value.”

About Power Solutions International, Inc.

Power Solutions International, Inc. (PSI) is a leader in the design, engineering and manufacture of a broad range of advanced, emission-certified engines and power systems. PSI provides integrated turnkey solutions to leading global original equipment manufacturers and end-user customers within the energy, industrial and transportation end markets. The Company’s unique in-house design, prototyping, engineering and testing capabilities allow PSI to customize clean, high-performance engines using a fuel agnostic strategy to run on a wide variety of fuels, including natural gas, propane, gasoline, diesel and biofuels.

PSI develops and delivers complete power systems that are used worldwide in stationary and mobile power generation applications supporting standby, prime, demand response, microgrid, and co-generation power (CHP) applications; and industrial applications that include forklifts, agricultural and turf, arbor care, industrial sweepers, aerial lifts, irrigation pumps, ground support, and construction equipment. In addition, PSI develops and delivers powertrains purpose-built for medium-duty trucks and buses including school and transit buses, work trucks, terminal tractors, and various other vocational vehicles. For more information on PSI, visit www.psiengines.com.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements regarding the current expectations of the Company about its prospects and opportunities. These forward-looking statements are entitled to the safe-harbor provisions of Section 21E of the Securities Exchange Act of 1934. The Company has tried to identify these forward-looking statements by using words such as “anticipate,” “believe,” “budgeted,” “contemplate,” “estimate,” “expect,” “forecast,” “guidance,” “may,” “outlook,” “plan,” “projection,” “should,” “target,” “will,” “would,” or similar expressions, but these words are not the exclusive means for identifying such statements. These statements are subject to a number of risks, uncertainties, and assumptions that may cause actual results, performance or achievements to be materially different from those expressed in, or implied by, such statements.

The Company cautions that the risks, uncertainties and other factors that could cause its actual results to differ materially from those expressed in, or implied by, the forward-looking statements, include, without limitation: the impact of the ongoing COVID-19 pandemic could have on the Company’s business and financial results; the Company’s ability to continue as a going concern; the Company’s ability to raise additional capital when needed and its liquidity; uncertainties around the Company’s ability to meet funding conditions under its financing arrangements and access to capital thereunder; the potential acceleration of the maturity at any time of the loans under the Company’s uncommitted senior secured revolving credit facility through the exercise by Standard Chartered Bank of its demand right; the timing of completion of steps to address, and the inability to address and remedy, material weaknesses; the identification of additional material weaknesses or significant deficiencies; risks related to complying with the terms and conditions of the settlements with the Securities and Exchange Commission (the “SEC”) and the United States Attorney’s Office for the Northern District of Illinois (the “USAO”); variances in non-recurring expenses; risks relating to the substantial costs and diversion of personnel’s attention and resources deployed to address the internal control matters; the Company’s obligations to indemnify past and present directors and officers and certain current and former employees with respect to the investigations conducted by the SEC and the criminal division of the USAO, which will be funded by the Company with its existing cash resources due to the exhaustion of its historical primary directors’ and officers’ insurance coverage; the ability of the Company to accurately forecast sales, and the extent to which sales result in recorded revenues; changes in customer demand for the Company’s products; volatility in oil and gas prices; the impact of U.S. tariffs on imports from China on the Company’s supply chain; the impact of increasing warranty costs and the Company’s ability to mitigate such costs; any delays and challenges in recruiting key employees consistent with the Company’s plans; any negative

impacts from delisting of the Company’s common stock par value $0.001 from the NASDAQ Stock Market and any delays and challenges in obtaining a re-listing on a stock exchange; and the risks and uncertainties described in reports filed by the Company with the SEC, including without limitation its Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and the Company’s subsequent filings with the SEC.

The Company’s forward-looking statements are presented as of the date hereof. Except as required by law, the Company expressly disclaims any intention or obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise.

Contact:

Power Solutions International, Inc.

Philip Kranz

Director of Investor Relations

+1 (630) 451-5402

Philip.Kranz@psiengines.com