Ann Arbor is reinventing the power company

If you live in Ann Arbor, Michigan, your rooftop could soon be part of a new type of sustainable city-owned utility.

Most new renewable energy projects take the form of massive wind or solar farms. Ann Arbor, Michigan, is trying something different: a new city-owned utility is building a local power network within city limits, made up of solar microgrids and geothermal energy installed at homes and businesses.