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Northern Power Systems Selected for New On-Site CHP System at Glendale, California Office Building
Designed for maximum energy cost savings, system expected to deliver 86% of 300,000-square foot building's total electrical power requirement

WAITSFIELD, Vt., Jun 17, 2004 /PRNewswire-FirstCall via COMTEX/ -- SHM Partners has contracted with Northern Power Systems, a subsidiary of Distributed Energy Systems Corp. (Nasdaq: DESC) for the engineering, construction and installation of a custom designed, on-site combined heat and power (CHP) system to be located at 550 North Brand Boulevard in Glendale, California. The $1.9 million turnkey system is expected to produce 86% of the total electricity currently used at the 300,000-square foot facility, which is one of the premier, Class A commercial office buildings in this Los Angeles suburb.

At the heart of the new CHP system are two Waukesha 375 kW natural gas-fired engine generator sets with fully integrated heat recovery systems. Operating in parallel with the local utility electric grid, the generators will supply the building's base electrical load on a 24/7 basis. Heat from the engines and exhaust systems will be used to produce hot water that will drive a 240-ton absorption chiller connected to the current chilled water loop within the building. Northern's proprietary microprocessor-based power electronics and supervisory control system will operate the system to maximize energy efficiency and cost savings. The system is expected to reduce the facility's annual energy costs by up to 50% when it is commissioned in early 2005.

Economic analysis drove vendor selection

SHM Partners chose Northern's turnkey system design over several other competing proposals based on Northern's proven technical expertise and its detailed economic analysis of the system's net cost savings after capital costs. SHM Partners arranged for 100% financing of the capital cost of the system with a seven- year capital equipment lease. Because the expected annual energy cost savings will exceed the annual lease payments, the system is anticipated to deliver positive cash flow and reduced operating expense over the life of the lease. As a result of the net reduction in operating expenses, the system could substantially increase the property's asset value.

Cogen system further improves efficiency of this "Energy Star" rated building

Installation of Northern's cogeneration system is the fourth phase of an energy efficiency program pioneered by SHM Partners on behalf of the building's ownership, 550 North Brand Owner's Corporation. Earlier projects included installation of energy efficient lighting and motion sensors; variable frequency drives on all pumps, fans and motors (including a custom engineered drive for its chiller plant); and a state of the art automated energy management system executing hundreds of pages of operating sequence program code for the optimization of each of the building's electro-mechanical systems. These projects yielded significant improvements in energy efficiency and, as a result, the building is one of the few buildings in the Los Angeles area to earn the EPA's prestigious Energy Star(TM) award.

"Installation of the cogen system is the next step of our energy efficiency program for the 550 North Brand property," noted Weston Munselle, a managing partner of SHM Partners, the property manager for the building's owner, 550 North Brand Blvd Owner's Corporation and formerly, the building developer. "First we reduced the property's demand for electricity by upgrading to high efficiency operating systems. Now, with this cogen system, we will reduce the cost of our energy supply and simultaneously reduce another 500,000 kWh in building electrical demand by using the cogen system's waste heat to produce chilled water. This system will be our largest investment to date, but, similar to our other energy efficiency projects, it too will yield positive cash flow and high returns. Furthermore, and in addition to the environmental benefit of reduced greenhouse gas emissions, we will be doing our part in relieving strain on the beleaguered California electricity supply and distribution market. Lastly, without the full support and commitment of the building owner, 550 North Brand Owner's Corporation, these important and innovative strategies to reduce energy demand and operating costs while benefiting the environment would never have been achievable."

System to qualify for state incentive payment and other benefits

Northern has designed the cogeneration system to meet the combined electrical and thermal efficiency standards of the California Public Utilities Commission (CPUC) Self-Generation Incentive Program, which was enacted to encourage onsite generation in response to the state's energy crisis in 2000/2001. As a result, the system has qualified for a 30% rebate of its capital cost from the State of California. The system will also qualify for a reduced natural gas transmission and distribution rate from SoCal Gas and be exempt from stand-by electric tariffs from the local utility due to its low emissions of greenhouse gases and other smog-forming particulates.

Finally, the new cogen system at 550 North Brand Boulevard will comply with the State of California's Rule 21 Interconnection requirements, thereby allowing the two 375 kW synchronous generators to run in parallel with the local utility electric grid. Northern's proprietary protective relay design has met the stringent Rule 21 requirements on other California projects by providing anti-islanding, reverse power flow, primary fault detection and other protection capabilities.

About SHM Partners

Founded in 1985, Smith, Hricik and Munselle Management Company (dba SHM Partners) is a multi-faceted real estate development and management company based in Downtown Los Angeles. The firm has expertise in property acquisition and disposition, finance and planning, entitlements and governmental relations, construction management, marketing and leasing, property management and energy management. Utilizing this expertise, the firm has acquired, planned, developed and/or operated over 6 million square feet of office, mixed use, residential and film production space.

About Northern Power Systems, Inc.

Northern Power Systems designs, builds and installs ultra-reliable power solutions for commercial, industrial, government, and military customers. The company also conducts path-breaking research and development in the areas of renewable energy, distributed generation and hydrogen technology. Since its founding in 1974, Northern has installed over 800 systems in 45 countries on all seven continents. Northern Power Systems, Inc. is headquartered in Waitsfield, Vermont and employs 100 people with engineering, fulfillment, and customer-support capabilities. The company is a wholly owned operating unit of Distributed Energy Systems Corp.

About Distributed Energy Systems Corp.

Distributed Energy Systems Corp. (Nasdaq: DESC) creates and delivers products and solutions to the emerging decentralized energy marketplace, giving users greater control over their energy cost, quality, and reliability. As the parent company of Proton Energy Systems, Inc. (http://www.protonenergy.com) and Northern Power Systems, Inc., Distributed Energy Systems delivers a combination of practical, ready-today energy solutions and the solid business platforms for capitalizing on the changing energy landscape. For more information, visit http://www.distributed-energy.com.

This press release contains forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. Statements contained herein concerning Northern Power System's and Distributed Energy's goals, projections and other statements that are not statements of historical fact, including statements concerning completion and performance of the CHP system may be deemed to be forward-looking information. Without limiting the foregoing, words such as "anticipates," "believes," "could," "estimate," "expect," "intend," "may," "might," "should," "will," and "would" and other forms of these words or similar words are intended to identify forward-looking information. Northern Power System's and Distributed Energy's actual results may differ materially from those indicated by these forward-looking statements as a result of various important factors. Northern Power Systems and Distributed Energy each disclaims any obligation to update these forward-looking statements. Factors that could cause results to differ materially from those contained in Northern Power Systems' and Distributed Energy's forward-looking statements include, Northern Power Systems' failure to complete construction of its systems, the impact of competitive systems and products and other factors detailed in Distributed Energy's Form 10-Q for quarter ended March 31, 2004, and other filings Distributed Energy may make from time to time with the SEC.

Distributed Energy Systems Corp.
Investor Relations
203-678-2355

Marilynn Meek
General Info
The Financial Relations Board for Distributed Energy Systems Corp
212-445-8451

Weston Munselle
SHM Partners
213-430-3903
wmunselle@shmpartners.com