blue
cable
clear
cloud
communication
concrete
connection
current
danger
detail
distribution
electric
electrical
electricity
energy
engineering
equipment
generator
high
industrial
industry
insulator
line
metal
network
overhead
pillar
pole
post
power
pylon
railway
sky
station
steel
structure
supply
system
technology
telegraph
train
transformer
transmission
transport
transportation
utility
voltage
watt
wire