In order to demonstrate a complementary relationship between solar ene
rgy and wind energy, the authors proposed the WISH(Wind and Solar Hybr
id) type windmill. The flexible amorphous photovoltaic modules are att
ached to the buckets of Savorius type windmill. After eight months ope
ration of the WISH type windmill in the field, we confirmed that there
exists a complementary relationship between solar energy and wind ene
rgy. We also found that the power generation of this type of windmill
was nearly twice as large as those without photovoltaic modules.