An Irish university has launched the world’s largest hydro-electric wave energy converter off the coast of northern Scotland.

The so-called Oyster is a mechanically-hinged flap that is embedded into the sea floor — at a depth of about 32 feet (10 meters) — and moves with the motions of the waves. That wave energy pumps high-pressure water to a shore-based electric turbine.

Power will be fed into the national grid and provide electricity to homes in the Orkney islands. Researchers say a farm of 20 Oysters could eventually provide enough electricity to power 9,000 three-bedroom homes.

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The Obama administration is awarding $3.4 billion in grants to modernize the national electric grid. One-hundred companies, utilities, manufacturers, and cities will receive the grants — ranging from $400,000 to $200 million — for projects that help build a “smart” grid that cuts energy costs, reduces blackouts, and has the capacity to deliver more wind and solar energy to American homes and businesses. Calling the nation’s grid system “dilapidated,” Carol Browner, the Obama administration’s top adviser on climate and energy issues, said federal funds would be used to expand the national grid and make it work more efficiently.

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