The ocean's vast, endless movement packs the power to meet a quarter of America's energy needs.
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Nevertheless, wave energy technology lags well behind wind and solar power, with technical hurdles still to be overcome.
To help accomplish that, the Navy is testing wave energy devices in the turquoise waters off Hawaii.
The project consists of two buoys that generate electricity from the up-and-down and side-to-side movement of the ocean.
Some of the modest amount of current generated is being fed into Oahu's power grid. Experts say it is the first wave-produced electricity to go online in the U.S.