http://energy.hawaii.gov/wp-content/uploads/2011/10/HSEO_FF_May20...

http://energy.hawaii.gov/wp-content/uploads/2011/10/HSEO_FF_May2015.pdf

Surrounded by the Pacific Ocean, Hawaii is rich in ocean renewable energy resources.
Ocean energy includes both hydrokinetic and thermal resources.

Hydrokinetic technologies tap the movement in the ocean—waves, currents and
tides—to generate electricity. Ocean Thermal Energy Conversion (OTEC) makes use of
the temperature differences between warm surface waters and cold, deep ocean
waters.
Hawaii has superior potential for wave energy and OTEC. However,
ocean current and tidal resources are not as promising with presently‐envisioned
technologies in Hawaii.

Ocean energy research, development and demonstration projects are taking place in
Hawaii and elsewhere in the world.

Read on....