Without expensive and difficult-to-maintain tracking systems, there is no way for flat panels to continuously face the sun.

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For the Fetzer project, MMA Renewable Ventures paid to install the solar panels, and it will own them and maintain them.

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It drives green employment, such as people who will install solar panels on rooftops, do energy audits, or help install and maintain wind turbines, thus generating its own economic multiplier effect.

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SolarCity, which has said it plans to go public and has filed a confidential IPO registration statement, will install, own and maintain the solar arrays, financing the projects through debt-equity funds it taps to pay for panels for customers who lease their photovoltaic systems.

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