Wave generator pumps power to Scotland
ORKNEY, SCOTLAND - Wave energy got a boost with the connection of the Oyster hydroelectric device to the electricity grid in Scotland.
Aquamarine Power activated the connection of the Oyster in the waters off Orkney, marking one of the few ocean power devices to be producing electricity.
The device is a hydraulic pump operated by a "hinged flap," where a large metal piece moves back and forth from the motion of the waves. The movement moves a hydraulic piston that pumps water underground to a hydroelectric turbine that drives a generator to make electricity.
The peak power output of the Oyster 1 is about two megawatts, depending on the location. The company, which received research funding from the UK government, is now working on a second-generation device.
There are a number of technologies being pursued to convert wave or tidal energy into electrical energy, including underwater generators. The advantage of the pump design is that it's relatively simple and many components, such as gearboxes and generators, are not exposed to the water.
Twenty Oysters, which are attached to the seabed at about 10 meters of water, could produce enough electricity to power 9,000 homes in the UK, according to Aquamarine Power.
In the U.S., the Seadog Pump uses a similar approach of pumping water offshore to a hydro-electric turbine to make electricity.
The Oyster was tested at the European Marine Energy Centre. In the U.S., there is an effort to establish an ocean power research center in southern Massachusetts.
Related News

Quebec and other provinces heading toward electricity shortage: report
MONTREAL - Quebec and other provinces in central and eastern Canada are heading toward a significant shortage of electricity to respond to the various needs of a transition to renewable energy.
This is according to Polytechnique Montréal’s Institut de l’énergie Trottier, which published a report titled A Strategic Perspective on Electricity in Central and Eastern Canada last week.
The white paper says that at the current rate, most provinces will be incapable of meeting the electricity needs created by the increase in the number of electric vehicles and the decarbonization of building heating by 2030. “The situation worsens if we consider carbon…