alternative
blade
blue
clean
conservation
electricity
energy
environment
environmental
farm
field
force
friendly
generate
generation
generator
green
industry
landscape
mast
metal
mill
natural
nature
ocean
power
preservation
production
propeller
recycling
renewable
rotate
rotation
safe
sky
source
spin
stand
sun
sunset
technology
tower
turbine
watts
white
wind
windmill
wing
wings