blue
cable
column
danger
ecology
electric
electric substation
electrical
electrical substation
electricity
energy
environment
equipment
factory
fence
grass
hazard
herb
industry
jeopardy
line
main
menace
mill
peril
pillar
plant
pole
pollution
post
power
power substation
risk
safety
security
sky
station
structure
summer
sunny
supply
technology
threat
transformer
transmission
voltage
wire
works