alternating
blue
cable
danger
distribution
dusk
electric
electrical
electricity
energy
engineering
environment
equipment
evening
framework
generator
global
high
industrial
industry
line
metal
network
night
orange
plant
power
pylon
red
resource
silhouette
sky
station
steel
structure
sun
sunlight
sunrise
sunset
supply
tall
technology
tower
transmission
twilight
volt
voltage
watt
wire
yellow