Aerojet, Solar Power, Inc. and SMUD Dedicate 3.6 Megawatt Solar System - Announce 2.4 Megawatt Expansion at Aerojet Site / At six megawatts, the Aerojet project will be one of the largest in the U.S.

SACRAMENTO, Calif. and ROSEVILLE, Calif., Nov. 10 /PRNewswire-FirstCall/ -- Aerojet, a GenCorp company, and Solar Power, Inc. ("SPI")(OTC Bulletin Board: SOPW), announced jointly today that the companies have entered into agreement to add an additional 2.4 megawatts to the single-axis tracker photovoltaic solar system currently installed at Aerojet's Sacramento, Calif. site. Construction of the 3.6 megawatt solar system at Aerojet's facility was initiated in June 2009 and was already the largest single-site industrial project in California and one of the largest in the country. The site is located within the Sacramento Municipal Utility District (SMUD).

The announcement of an additional 2.4 megawatts was made during today's dedication event and press conference hosted by Aerojet, SPI and SMUD. The event was held at the same location where California Governor Arnold Schwarzenegger signed an executive order on Sept. 15, 2009 calling for 33 percent of energy consumed in California to come from renewable resources by the year 2020. Heralding the expansion of the solar array, Governor Schwarzenegger said, "The addition of this large-scale solar project is further evidence that reliable, renewable and pollution-free technology is here to stay. And this project is great news for California because it will help us meet our ambitious renewable energy and environmental goals, lead to more homes and businesses powered by sunshine and create new jobs in the clean-tech industry."

"We like to say 'At Aerojet, it really is rocket science,'" said Scott Neish, president of Aerojet. "For 60 years, energy management has been at the root of our aerospace operations, and our venture into broader energy management programs demonstrates the real commitment Aerojet is making toward operating in a more sustainable fashion and reducing our company's carbon footprint. This solar partnership is a concrete example of this commitment."

The solar array at Aerojet is a ground-mounted system utilizing a single-axis tracking system that follows the sun's course throughout the day to maximize electricity production. The additional array will utilize 11,712 SPI 205 watt modules mounted atop eight tracking arrays. When completed, the entire six megawatt system will cover more than 40 acres of the Aerojet site and utilize 22 tracking arrays and 29,344 SPI 205 watt photovoltaic modules. Based on its performance characteristics, the SPI 205 watt module is currently the number-one-ranked PV solar module in its class with the California Energy Commission.

"Prior to this addition, the Aerojet project was already one of the largest system installations in the U.S. this year, and the foundational portion of our growing portfolio and pipeline of multi-megawatt projects. With a 40 percent increase in the size of the system, the Aerojet site is now host to the largest single-site industrial installation in California," said SPI's CEO & Chairman, Steve Kircher. "Aerojet is a wonderful company to work with and we are very happy about the addition to the system. It speaks volumes about our ability to install a superior solution on-time, on-target and on-budget," Mr. Kircher concluded.

Installation of the 2.4 megawatt system addition is expected to be completed in April 2010. SMUD is scheduled to interconnect the system to the power grid at that time. "SMUD is very proud to be a partner in this project," said SMUD General Manager and CEO, John DiStasio. "We have a long solar heritage dating back to the early 1980s when we built the solar PV plant which is now the oldest megawatt-scale photovoltaic power plant continuously operating in North America. The Aerojet solar project is a huge benefit in terms of improving the environment of our community and the region as well as being a valuable part of increasing the stability and reliability of the SMUD electrical grid."

During its first year of use, the Aerojet system will offset 6,003 tons of carbon dioxide, 23.8 tons of sulfur dioxide and approximately 9.3 tons of nitrogen oxide that would have otherwise been produced using fossil fuel power production. The first-year net clean energy benefits equate to offsetting 11,825,814 automobile miles driven or the clean air benefits realized from planting 1,396,423 trees. With a system life expectancy of 25 years, the cumulative life-cycle environmental offsets for a system of this scope are significant.

About Solar Power, Inc.:

Founded in 2005, Solar Power, Inc. is a vertically integrated solar energy solution provider offering the North American commercial and public sector building markets a complete solution through a single brand. Throughout Europe, Asia and Australia the Company sells its products direct to distributors and turnkey solutions providers. The Company's Yes! Solar, Inc. subsidiary provides the U.S. small- to mid-sized business and residential market segments with turnkey PV solar systems through a growing dealer network. Solar Power, Inc. operates from its Roseville, California headquarters.

Safe Harbor Statement:

This release contains certain "forward-looking statements" relating to the business of Solar Power, Inc., its subsidiaries and the solar industry, which can be identified by the use of forward looking terminology such as "believes, expects" or similar expressions. The forward looking statements contained in this press release include statements regarding the Company's ability to execute its growth plan and meet revenue and sales estimates, enter into formal long-term supply agreements, and market acceptance of products and services. These statements involve known and unknown risks and uncertainties, including, but are not limited to, general business conditions, managing growth, and political and other business risk. All forward-looking statements are expressly qualified in their entirety by this Cautionary Statement and the risks and other factors detailed in the Company's reports filed with the Securities and Exchange Commission. The Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities law.

About Aerojet:

Aerojet is a world-recognized aerospace and defense leader principally serving the missile and space propulsion, defense and armaments markets. GenCorp is a leading technology-based manufacturer of aerospace and defense products and systems with a real estate segment that includes activities related to the entitlement, sale, and leasing of the company's excess real estate assets. Additional information about Aerojet and GenCorp can be obtained by visiting the companies' Web sites at http://www.aerojet.com/ and http://www.gencorp.com/.

GenCorp Safe Harbor Statement:

This press release contains forward-looking statements based on current management expectations. Numerous factors, including those related to market conditions and those detailed from time to time in GenCorp's filings with the Securities and Exchange Commission, may cause results to differ materially from those anticipated in the forward-looking statements. Many of the factors that will determine GenCorp's future results are beyond the ability of GenCorp to control or predict. These statements are subject to risks and uncertainties and, therefore, actual results may differ materially. Readers should not place undue reliance on forward-looking statements, which reflect management's views only as of the date hereof. GenCorp undertakes no obligation to revise or update any forward-looking statements, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise.

About SMUD:

As the nation's sixth largest publicly owned utility, SMUD has been providing low-cost, reliable electricity for more than 60 years to Sacramento County (and a small portion of Placer County). SMUD is a recognized industry leader and award winner for its innovative energy efficiency programs, renewable power technologies, and for its sustainable solutions for a healthier environment. For more information visit us at smud.org.

Aerojet

CONTACT: Mike Anderson, Vice President Marketing of Solar Power, Inc.,
[phone], [e-mail]; or Brion Tanous of CleanTech IR,
Inc., [phone], [e-mail]; or Linda Cutler, Vice
President, Corporate Communications of GenCorp, [phone],
[e-mail], or Glenn Mahone, Executive Director Strategic
Communications of Aerojet, [phone], [e-mail], or SMUD,
News organizations can call [phone] during business hours,
[e-mail]

Web Site: http://www.aerojet.com/
http://www.solarpowerinc.net/

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