Hydrogenics Supplying Fuel Cell Power Modules for American Power Conversion's New InfraStruXure'TM' with Integrated Fuel Cells System

MISSISSAUGA, Ontario--June 13, 2005--Hydrogenics Corporation , a designer and manufacturer of hydrogen and fuel cell systems, today announced it is supplying fuel cell power modules to American Power Conversion Corporation (APC), a leading global supplier of high availability systems for network-critical physical infrastructure (NCPI), for its new InfraStruXure(TM) with Integrated Fuel Cells System.

In November 2004, Hydrogenics announced that it had received a follow-on order for 25 fuel cell power modules to be incorporated into back-up power products from one single OEM customer. Hydrogenics now reports that APC is the previously undisclosed customer for this order for 25 HyPM(TM) XR back-up power units - the largest commercial order for fuel cell products in Hydrogenics' history. Hydrogenics has delivered the first five units of the order, and expects the remainder of the units to be delivered throughout 2005.

"We are thrilled to work with APC in its new InfraStruXure(TM) with Integrated Fuel Cells System. This innovative offering integrates Hydrogenics' fuel cell power modules in critical power applications that require reliable, extended run capabilities," said Pierre Rivard, President and CEO of Hydrogenics Corporation. "APC's market position and reputation are exceptional. Our job is to provide fuel-cell based power products consistent with APC's standing and the needs of APC's customers. We are pleased with APC's selection of Hydrogenics after their supplier qualification process. We believe this validates the reliability and performance of Hydrogenics' fuel cell technology and is an important step to drive adoption of our products in this target market."

"APC is constantly developing innovative systems to dramatically increase availability in all aspects of the NCPI," said Dwight Sperry, APC's vice president of Enterprise Systems and Business Networks. "APC's InfraStruXure(TM) with Integrated Fuel Cells System offers the first practical fuel cell solution for data center extended-run applications."

The 25 HyPM(TM) XR units will be used as part of APC's InfraStruXure(TM) with Integrated Fuel Cells product offering for uninterruptible power in data centers. This fuel cell powered 'extended run' product is modular in design, matching the InfraStruXure(TM) product design architecture. The units are available immediately for purchase from APC. A standard APC 42U rack enclosure can house up to three fuel cell modules, or 30kW (3 x 10kW).

APC's new system, supported by APC's Global Services network, also:

- Improves availability by minimizing points of failure with the system installed close to the load;

- Lowers the total cost of ownership with a design life of 10 years or greater than5000 stop/starts;

- Lowers the total cost of ownership with a more compact footprint; and

- Improves agility by allowing power generation in more locations that may have emissions restrictions. The only system byproducts are heat and water.

About Hydrogenics

Hydrogenics Corporation (www.hydrogenics.com) is a leading global developer of clean energy solutions, advancing the Hydrogen Economy by commercializing hydrogen and fuel cell products. The company has a portfolio of products and capabilities serving the hydrogen and energy markets of today and tomorrow. Hydrogenics, based in Mississauga, Ontario, Canada, has operations in North America, Europe and Asia.

About American Power Conversion

Founded in 1981, American Power Conversion is a leading provider of global, end-to-end solutions for real-time infrastructure. APC's comprehensive products and services offering, designed for both home and corporate environments, improves the availability, manageability and performance of sensitive electronic, network, communication and industrial equipment of all sizes. Headquartered in West Kingston, Rhode Island, APC reported sales of $1.7 billion for the year ended December 31, 2004, and is a Fortune 1000, Nasdaq 100 and S&P 500 Company. All trademarks are the property of their owners.

CAUTION REGARDING FORWARD-LOOKING STATEMENTS

This release contains forward-looking statements within the meaning of the "safe harbor" provisions of the U.S. Private Securities Litigation Reform Law of 1995. These statements are based on management's current expectations and actual results may differ from these forward-looking statements due to numerous factors, including changes in the competitive environment adversely affecting the products, markets, revenues or margins of Hydrogenics' business. Readers should not place undue reliance on Hydrogenics' forward-looking statements. Investors are encouraged to review the section captioned "Risk Factors" in Hydrogenics' regulatory filings with the Canadian securities regulatory authorities and the United States Securities and Exchange Commission for a more complete discussion of factors that could affect Hydrogenics' future performance. Furthermore, the forward-looking statements contained herein are made as of the date of this release, and Hydrogenics undertakes no obligations to revise or update any forward-looking statements in order to reflect events or circumstances that may arise after the date of this release. The forward-looking statements contained in this release are expressly qualified by this.

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