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abstract, alternative, architecture, array, building, cells, clean, climate, closeup, conservation, development, diagonal, ecofriendly, economy, efficiency, electrical, electricity, energy, environment, environmental, exterior, friendly, future, futuristic, green, grid, house, infrastructure, innovation, modern, nature, outdoors, panels, pattern, photovoltaic, power, power generation, renewable, renewable energy, resource, rooftop, saving, social issues, solar, solar panel, sunlight, sustainable, technology, tied, urban,