alternative
barrage
building
color
concrete
conservation
dam
design
development
eco
ecology
electric
electricity
energy
engineering
environment
environmental
equipment
facility
flat
generation
generator
hydro
hydroelectric
hydroelectricity
icon
illustration
industrial
industry
lake
landscape
outdoors
plant
power
renewable
resource
river
sign
single
station
stencil
supply
symbol
tall
technology
turbine
ui
water