background
black
business
cable
connection
construction
design
electric
electrical
electricity
element
energy
engineering
flat
generation
graphic
graphics
grid
icon
illustration
industrial
industry
isolated
line
linear
metal
network
object
pictogram
power
pylon
sign
silhouette
single
station
steel
structure
symbol
technology
telegraph
telephone
tower
transformer
transmission
urban
voltage
watt
white
wire