INDIANAPOLIS (AP): A new report by a conservation group says Indiana has one of the nation’s worst regulatory atmospheres for fostering the development of the rooftop solar power industry.

Tuesday’s report from the Center for Biological Diversity ranks Indiana among 10 states, including Michigan and Wisconsin, which essentially discourage solar-rooftop development.

Indiana and the nine other states received an “F” in the nonprofit group’s assessment of policies and regulations that could help boost their solar-rooftop industries.

Report author Greer Ryan says those 10 states’ weak or nonexistent policies mean their distributed solar markets “have never been given a chance to shine.”

The Center for Biological Diversity says Indiana needs to make several changes, including strengthening its billing mechanism for crediting solar power system owners for electricity they add to the grid.