YOKKAICHI, Japan—Armed with expensive and elaborate camera equipment, the tourists excitedly disembarking the charter bus have all the markings of a stereotypical tour group. But they aren't interested in the area's renowned pottery making or its tranquil Shisuian teahouse. They are here to see a giant power plant billowing smoke.

Japan's Smokestacks Draw Industrial-Strength Sightseers - WSJ.com