CHAPEL HILL - INNOVATION is driving a boom in solar power, but some of the most compelling advances are taking place in financial engineering rather than photovoltaic technology.

Solar power is simple, clean and easily installed, but manufacturing solar panels is expensive, which is why this energy source is out of reach for many residences and businesses. Lately, however, solar power companies have discovered that they can attract more buyers if they act as financial intermediaries as well as suppliers of equipment and systems used to generate electricity from sunlight....

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