Columbia subject headings:
Harvard subject headings:
Electric utilities--Government policy--Germany.
Energy conservation--Germany--History--21st century.
Energy policy--Germany--History--21st century.
Power resources--Germany--History--21st century.
Renewable energy sources--Germany--History--21st century.
Renewable energy sources--Government policy--Germany.
Sustainability--Germany--History--21st century.
Princeton subject headings:
Electric utilities--Government policy--Germany.
Renewable energy sources--Government policy--Germany.