As scenes of power plants give many influences to environments, the pl
ants that harmonized with the environments are demanded. We developed
a landscape simulation system for the plants by using computer graphic
s technologies. This system has functions to generate realistic images
about plant buildings and environments. Since the system contains inf
ormation of ridge lines in addition to usual terrain data, the terrain
shapes are expressed more precisely. Because the system enables users
to visualize plant construction plans, the advance evaluations of pla
nt scenes become possible. We regard this system as useful for environ
mental assessment of power plants.