alternative
battery
black
blade
cell
conservation
current
eco
ecology
electric
electricity
element
energy
environment
farm
green
icon
industry
light
line
low carbon
mill
nature
panel
photo
photovoltaic
picto
pictogram
pictograph
power
renewable
resource
shining
sign
solar
source
storage
sun
sunlight
supply
sustainable
symbol
transition
turbine
white
wind
windmill