Companies tapping the tides in quest for renewable energy

Pilot projects are underway in Washington, Alaska, Florida, California, Oregon and Hawaii, New York and elsewhere. The technology remains in its infancy, however, and costs are prohibitively high. Moored in the channel, the little gray barge strains against a raging morning tide. The torrent soon will drain nearby rocky inlets and fishing harbors by 20 feet — as high as a two-story house — only to flood them again six hours later.

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Companies tapping the tides in quest for renewable energy