artificial
atom
bituminous
building
cables
charcoal
chimney
city
cleaning
coal
concrete
construction
cooling
crock
electric
electricity
emission
energy
engineer
environment
exhalation
factory
filter
fume
gas
heat
high voltage
induction
industrial
industry
nuclear
pole
pollution
power
production
sky
smoke
smokestack
station
steam
technologic
technology
thermal
tower
transmission
transmission line
voltage
warmth
water
wire