Germany is still at the top of the class when it comes to solar power, according to a new report by nonprofit Global Green USA.

The group graded 16 countries plus the state of California in terms of how much solar power they added in installations and what kind of policies they have for future development.

Germany– the world’s biggest solar power market — again got the highest grade, with an A minus.

Italy and environmental trendsetter California pulled a respectable B minus, with nearly 400 percent annual growth in installed capacity.

The group gave Poland and Russia both failing grades because their “governments focused marginally on other renewable energy sources” and do not have any incentives that target photovoltaic solar power systems that turn sunlight into electricity. (Read the full report here.)