As Japan's government clings to nuclear power even after the Fukushima crisis, the private sector is moving ahead with greater use of renewables to power their operations amid growing international awareness of climate change.

For instance, in March Daiwa House Industries Co. became a member of both RE100 (Renewable Electricity) and EP100 (Energy Productivity), two global initiatives by the Climate Group.

RE100 is a global, collaborative initiative of influential businesses committed to using 100 percent renewable electricity, while EP100 brings together companies committed to doubling energy productivity to lower greenhouse gas emissions. Among RE100's 136 members are U.S. General Motors Co. and Dutch consumer goods giant Unilever.