Wind power is beginning to gain ground in Japan, and the public is paying more attention to clean energy in the wake of a series of nuclear accidents that have left many Japanese mistrustful of nuclear power. In October, Tomen Corp. opened Japan’s largest wind-power farm, and next month Tokyo Electric Power Co., the nation’s largest utility, will be opening its first wind power facility. Still, wind supplies only 0.04 percent of the nation’s electricity, and wind power boosters say that percentage is not likely to rise without more government help. Some politicians are considering introducing a bill that would require electric utilities to purchase a certain percentage of renewable power.