abstract
background
black
bottom
cable
current
danger
dark
draw
electric
electrical
electricity
energy
engineering
generator
grid
half tone
high
industrial
industry
infrastructure
line
metal
monochrome
network
outline
paint
plant
pole
power
pylon
shadow
shape
sky
station
steel
structure
supply
technology
tower
transformer
transmission
transmit
transportation
union
utility
view
voltage
watt
wire