Solar photovoltaic (PV) installations in Japan have now reached the 10 gigawatts (GW) milestone for cumulative PV capacity. Japan is only the fifth country to reach this mark, after Germany, Italy, China and the U.S. Both the U.S. and China reached 10 GW of solar PV within the past few months, according to new research featured in the NPD Solarbuzz Asia Pacific PV Market Quarterly Report.