black
blue
cable
color
communications
connection
construction
current
electric
electrical
electricity
energy
engineering
environment
equipment
field
frame
fuel
generation
generator
high
horizon
industrial
industry
line
metallic
network
orange
power
powerlines
pylon
red
row
silhouette
single
sky
station
steel
structure
sun
sunset
supply
tall
technology
tower
transformer
transmission
voltage
wire