A view of one of several rooftop photovoltaic arrays installed at Naval Weapons Station Seal Beach since 2008.

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SEAL BEACH, Calif. (Oct. 15, 2010) A view of one of several rooftop photovoltaic arrays installed at Naval Weapons Station Seal Beach since 2008. The arrays are contributing to the installation's goal of 25 percent renewable energy in the utility system within five years and the Department of the Navy's goal of 50 percent alternative energy use for shore-based facilities by 2020. (U.S. Navy photo by Mass Communication Specialist 2nd Class James R. Evans/Released)

101015-N-7981E-087 
 SEAL BEACH, Calif. (Oct. 15, 2010) A view of one of several rooftop photovoltaic arrays installed at Naval Weapons Station Seal Beach since 2008. The arrays are contributing to the installation's goal of 25 percent renewable energy in the utility system within five years and the Department of the Navy's goal of 50 percent alternative energy use for shore-based facilities by 2020. (U.S. Navy photo by Mass Communication Specialist 2nd Class James R. Evans/Released)