underwater
environmental
alternative
clean
conservation
eco
ecological
ecology
electric
electrical
electricity
energy
engineering
environment
flow
generate
generating
generation
generator
glowing
green
hydro
hydroelectric
icon
illustration
industrial
industry
marine
nature
neon
ocean
pictogram
plant
power
production
renewable
resource
sea
shining
sign
source
station
sustainable
symbol
technology
tidal
turbine
water
wave