Germany spent a total of €708 million (£619m) on research and development of energy technologies last year, according to reports.
The figure is believed to have increased from €399 million (£349m) in 2006 – a 77% rise in the last seven years. Reports claim a new study showed most of the research benefitted energy efficiency and renewable power projects, which accounted for around €500 million (£437.2m) of the total funding last year.
Some of the projects included reducing noise from offshore wind power and making buildings more energy efficient.
The study also showed Germany spent €133 million (£116.3m) on research into nuclear fusion and €75 million (£65.3m) on safety linked to its atomic reactors and disposal of nuclear waste as the country shuts its nuclear reactors.
German Economy Minister Philipp Roesler said: “Research and development of modern energy technologies are an important condition for the success of the energy switch.”
Earlier this month reports claimed Germany’s renewable energy subsidy could go against Europe’s competition laws.