In the three months since the March 11 earthquake and tsunami damaged the Fukushima No. 1 atomic plant, the nation's three reactor makers have started to focus more on renewable energy sources, particularly solar, wind and geothermal power.

Toshiba Corp., Mitsubishi Heavy Industries Ltd. and Hitachi Ltd. say they now have higher sales goals in the alternative energy fields, including pursuit of "energy-smart communities" that can save power consumption as a whole city or village by using energy control systems.

Analysts said the three reactor makers have little choice but to expand their natural energy-related pursuits because of the ever-strengthening aversion both at home and abroad to nuclear power, even though whether the government will act quickly to support such business remains a question.