19.5 Water can be used generate electricity Hydroelectric power comes from the kinetic energy of flowing water Temperature differences in the ocean can generate electricity Geothermal energy comes from the earth's interior The energy of ocean tides can be harnessed Fig 19.22 about 50 percent of the electricity generated in iceland is copyright.clich from geothermal sources. This is the blue lagoon, a warm poo created from the effluent of the hydrothermal power plant visible in the background19.5 Water can be used generate electricity Hydroelectric power comes from the kinetic energy of flowing water Temperature differences in the ocean can generate electricity Geothermal energy comes from the Earth’s interior The energy of ocean tides can be harnessed Fig 19.22 about 50 percent of the electricity generated in iceland is from geothermal sources. This is the blue lagoon, a warm pool created from the effluent of the hydrothermal power plant visible in the background