aerial
aged
air
ancient
big
chimney
clouds
cloudy day
coal
combined
cooling
danger
ecology
eldest
electric
electrical
electricity
emissions
energy
environment
factory
fired
gas
generation
generator
gray
industrial
industry
landscape
large
nuclear
old
pipes
plant
pollution
power
sky
slate
smoke
station
steam
technology
thermal
tower
toxic
turbine
vapor
warming
with steam