The debate over how to redevelop the World Trade Center site has revolved around several key concerns: the commercial interests of the real estate industry, the public's desire to embolden Manhattan's skyline with exciting architecture and the historic obligation to memorialize thousands of lost lives. As we continue to address and balance these concerns, let's also seize the chance to reclaim Ground Zero in the spirit of the twenty-first century, showcasing one of today's most inspiring and politically meaningful industrial movements: the revolution in clean energy.

Imagine for a moment that the structures surrounding the memorial will be sheathed in an invisible skin of electricity-producing solar cells. During the day, while electricity demand is peaking, the buildings will silently, automatically produce energy. No power plants or transmission lines necessary. No greenhouse emissions. No need for oil, coal, natural gas or nuclear energy. No risk of blackouts. No spiking electricity prices. Computer and phone networks, elevators, clocks, air conditioners and ATMs will all run simply, cleanly, like a crop of corn or a grove of trees, on sunlight. (The complex will be connected to the grid, drawing electricity when necessary--at night or on cloudy days--and pumping power back in when it creates a surplus.)

These high-tech buildings will supply all the services and comforts of a traditional commercial or residential complex but require less than half the electricity because of their green design features: superinsulated walls and windows; highly efficient appliances and lighting, heating and cooling systems; and a motion-sensing laser system that will automatically switch off lights and equipment when not in use. Whereas the original World Trade Center complex guzzled nearly 100 megawatts of electricity a day on peak days, with associated emissions, the new complex will be a net-zero-emission development. Moreover, this mini-El Dorado of energy independence and its surrounding neighborhood will be designed to have minimal need for cars and trucks. Once there, visitors will be in the greatest walking neighborhood in the world. The three airports, Kennedy, La Guardia and Newark, will be connected by train to the downtown terminal, making it an easy commute. An expanded network of ferries connecting lower Manhattan with Brooklyn, Queens, New Jersey and uptown will provide a fast and pleasurable way to get around. The heart of lower Manhattan will be knitted together by a clean, quiet street grid restored for use by pedestrians alone.

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